Merge remote-tracking branch 'origin/main' into agent-1/issue-37-create-cross-language-client-behavior-fixtures

Add client behavior fixtures
Merge pull request #83 from agent-2/issue-29-implement-event-sink-and-event-queue
2026-04-26 19:12:19 -04:00 · 2026-04-26 19:11:04 -04:00 · 2026-04-26 19:08:52 -04:00 · 2026-04-26 19:05:31 -04:00 · 2026-04-26 19:04:56 -04:00 · 2026-04-26 18:56:37 -04:00
177 changed files with 16932 additions and 336 deletions
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+
@@ -0,0 +1 @@
+
@@ -0,0 +1 @@
+
@@ -0,0 +1,36 @@
+{
+  "schemaVersion": 1,
+  "cases": [
+    {
+      "id": "missing-api-key",
+      "grpcStatusCode": "UNAUTHENTICATED",
+      "clientErrorCategory": "AuthenticationError",
+      "inputMetadata": {
+        "authorization": ""
+      },
+      "expectedRedactedOutput": "authentication failed: missing bearer token",
+      "retryableWithoutCredentialChange": false
+    },
+    {
+      "id": "invalid-api-key",
+      "grpcStatusCode": "UNAUTHENTICATED",
+      "clientErrorCategory": "AuthenticationError",
+      "inputMetadata": {
+        "authorization": "Bearer <redacted>"
+      },
+      "expectedRedactedOutput": "authentication failed: invalid API key <redacted>",
+      "retryableWithoutCredentialChange": false
+    },
+    {
+      "id": "missing-write-scope",
+      "grpcStatusCode": "PERMISSION_DENIED",
+      "clientErrorCategory": "AuthorizationError",
+      "inputMetadata": {
+        "authorization": "Bearer <redacted>"
+      },
+      "requiredScope": "mxaccess.write",
+      "expectedRedactedOutput": "authorization failed: missing scope mxaccess.write",
+      "retryableWithoutCredentialChange": false
+    }
+  ]
+}
@@ -0,0 +1,30 @@
+{
+  "sessionId": "session-fixture",
+  "correlationId": "gateway-correlation-register-1",
+  "kind": "MX_COMMAND_KIND_REGISTER",
+  "protocolStatus": {
+    "code": "PROTOCOL_STATUS_CODE_OK",
+    "message": "Register completed."
+  },
+  "hresult": 0,
+  "returnValue": {
+    "dataType": "MX_DATA_TYPE_INTEGER",
+    "variantType": "VT_I4",
+    "int32Value": 12
+  },
+  "statuses": [
+    {
+      "success": 1,
+      "category": "MX_STATUS_CATEGORY_OK",
+      "detectedBy": "MX_STATUS_SOURCE_RESPONDING_LMX",
+      "detail": 0,
+      "rawCategory": 0,
+      "rawDetectedBy": 0,
+      "diagnosticText": "OK"
+    }
+  ],
+  "diagnosticMessage": "COM Register returned server handle 12.",
+  "register": {
+    "serverHandle": 12
+  }
+}
@@ -0,0 +1,38 @@
+{
+  "sessionId": "session-fixture",
+  "correlationId": "gateway-correlation-write-1",
+  "kind": "MX_COMMAND_KIND_WRITE",
+  "protocolStatus": {
+    "code": "PROTOCOL_STATUS_CODE_MXACCESS_FAILURE",
+    "message": "MXAccess rejected the write."
+  },
+  "hresult": -2147220992,
+  "returnValue": {
+    "dataType": "MX_DATA_TYPE_NO_DATA",
+    "variantType": "VT_EMPTY",
+    "isNull": true,
+    "rawDiagnostic": "MXAccess returned no value for the failed write.",
+    "rawDataType": 2
+  },
+  "statuses": [
+    {
+      "success": 0,
+      "category": "MX_STATUS_CATEGORY_SECURITY_ERROR",
+      "detectedBy": "MX_STATUS_SOURCE_RESPONDING_LMX",
+      "detail": 321,
+      "rawCategory": 8,
+      "rawDetectedBy": 3,
+      "diagnosticText": "Write denied by provider security."
+    },
+    {
+      "success": 0,
+      "category": "MX_STATUS_CATEGORY_OPERATIONAL_ERROR",
+      "detectedBy": "MX_STATUS_SOURCE_RESPONDING_NMX",
+      "detail": 902,
+      "rawCategory": 7,
+      "rawDetectedBy": 5,
+      "diagnosticText": "Provider rejected the item state."
+    }
+  ],
+  "diagnosticMessage": "Fixture preserves a data-bearing MXAccess failure reply with HRESULT and status array."
+}
@@ -0,0 +1,159 @@
+{
+  "sessionId": "session-fixture",
+  "description": "Ordered event stream sample for one worker-backed session.",
+  "events": [
+    {
+      "family": "MX_EVENT_FAMILY_ON_DATA_CHANGE",
+      "sessionId": "session-fixture",
+      "serverHandle": 12,
+      "itemHandle": 34,
+      "value": {
+        "dataType": "MX_DATA_TYPE_INTEGER",
+        "variantType": "VT_I4",
+        "int32Value": 123
+      },
+      "quality": 192,
+      "sourceTimestamp": "2026-01-01T00:00:00Z",
+      "statuses": [
+        {
+          "success": 1,
+          "category": "MX_STATUS_CATEGORY_OK",
+          "detectedBy": "MX_STATUS_SOURCE_RESPONDING_LMX",
+          "detail": 0,
+          "rawCategory": 0,
+          "rawDetectedBy": 0,
+          "diagnosticText": "OK"
+        }
+      ],
+      "workerSequence": "1",
+      "workerTimestamp": "2026-01-01T00:00:00.010Z",
+      "gatewayReceiveTimestamp": "2026-01-01T00:00:00.015Z",
+      "onDataChange": {}
+    },
+    {
+      "family": "MX_EVENT_FAMILY_ON_WRITE_COMPLETE",
+      "sessionId": "session-fixture",
+      "serverHandle": 12,
+      "itemHandle": 34,
+      "value": {
+        "dataType": "MX_DATA_TYPE_DOUBLE",
+        "variantType": "VT_R8",
+        "doubleValue": 45.5
+      },
+      "quality": 192,
+      "sourceTimestamp": "2026-01-01T00:00:01Z",
+      "statuses": [
+        {
+          "success": 1,
+          "category": "MX_STATUS_CATEGORY_OK",
+          "detectedBy": "MX_STATUS_SOURCE_RESPONDING_LMX",
+          "detail": 0,
+          "rawCategory": 0,
+          "rawDetectedBy": 0,
+          "diagnosticText": "Write complete."
+        }
+      ],
+      "workerSequence": "2",
+      "workerTimestamp": "2026-01-01T00:00:01.010Z",
+      "gatewayReceiveTimestamp": "2026-01-01T00:00:01.015Z",
+      "hresult": 0,
+      "onWriteComplete": {}
+    },
+    {
+      "family": "MX_EVENT_FAMILY_OPERATION_COMPLETE",
+      "sessionId": "session-fixture",
+      "serverHandle": 12,
+      "itemHandle": 34,
+      "value": {
+        "dataType": "MX_DATA_TYPE_STRING",
+        "variantType": "VT_BSTR",
+        "stringValue": "operation-complete"
+      },
+      "quality": 192,
+      "sourceTimestamp": "2026-01-01T00:00:02Z",
+      "statuses": [
+        {
+          "success": 1,
+          "category": "MX_STATUS_CATEGORY_OK",
+          "detectedBy": "MX_STATUS_SOURCE_RESPONDING_NMX",
+          "detail": 0,
+          "rawCategory": 0,
+          "rawDetectedBy": 0,
+          "diagnosticText": "Operation complete."
+        }
+      ],
+      "workerSequence": "3",
+      "workerTimestamp": "2026-01-01T00:00:02.010Z",
+      "gatewayReceiveTimestamp": "2026-01-01T00:00:02.015Z",
+      "operationComplete": {}
+    },
+    {
+      "family": "MX_EVENT_FAMILY_ON_BUFFERED_DATA_CHANGE",
+      "sessionId": "session-fixture",
+      "serverHandle": 12,
+      "itemHandle": 34,
+      "value": {
+        "dataType": "MX_DATA_TYPE_FLOAT",
+        "arrayValue": {
+          "elementDataType": "MX_DATA_TYPE_FLOAT",
+          "variantType": "VT_ARRAY|VT_R4",
+          "dimensions": [
+            2
+          ],
+          "floatValues": {
+            "values": [
+              1.5,
+              2.5
+            ]
+          }
+        }
+      },
+      "quality": 192,
+      "sourceTimestamp": "2026-01-01T00:00:03Z",
+      "statuses": [
+        {
+          "success": 1,
+          "category": "MX_STATUS_CATEGORY_OK",
+          "detectedBy": "MX_STATUS_SOURCE_RESPONDING_LMX",
+          "detail": 0,
+          "rawCategory": 0,
+          "rawDetectedBy": 0,
+          "diagnosticText": "Buffered data delivered."
+        }
+      ],
+      "workerSequence": "4",
+      "workerTimestamp": "2026-01-01T00:00:03.010Z",
+      "gatewayReceiveTimestamp": "2026-01-01T00:00:03.015Z",
+      "onBufferedDataChange": {
+        "dataType": "MX_DATA_TYPE_FLOAT",
+        "qualityValues": {
+          "elementDataType": "MX_DATA_TYPE_INTEGER",
+          "variantType": "VT_ARRAY|VT_I4",
+          "dimensions": [
+            2
+          ],
+          "int32Values": {
+            "values": [
+              192,
+              192
+            ]
+          }
+        },
+        "timestampValues": {
+          "elementDataType": "MX_DATA_TYPE_TIME",
+          "variantType": "VT_ARRAY|VT_DATE",
+          "dimensions": [
+            2
+          ],
+          "timestampValues": {
+            "values": [
+              "2026-01-01T00:00:02Z",
+              "2026-01-01T00:00:03Z"
+            ]
+          }
+        },
+        "rawDataType": 5
+      }
+    }
+  ]
+}
@@ -0,0 +1,59 @@
+{
+  "schemaVersion": 1,
+  "fixtureSet": "mxaccess-gateway-client-behavior",
+  "contractName": "mxaccess-gateway",
+  "gatewayProtocolVersion": 1,
+  "workerProtocolVersion": 1,
+  "protoInputManifest": "clients/proto/proto-inputs.json",
+  "fixtures": [
+    {
+      "id": "command-reply.register.ok",
+      "category": "command_replies",
+      "messageType": "mxaccess_gateway.v1.MxCommandReply",
+      "path": "command-replies/register.ok.reply.json",
+      "expectation": "Successful command replies preserve protocol status, HRESULT, return value, status arrays, and method-specific output."
+    },
+    {
+      "id": "command-reply.write.mxaccess-failure",
+      "category": "command_replies",
+      "messageType": "mxaccess_gateway.v1.MxCommandReply",
+      "path": "command-replies/write.mxaccess-failure.reply.json",
+      "expectation": "MXAccess failures are data-bearing replies with HRESULT and status details, not transport failures."
+    },
+    {
+      "id": "event-stream.session-ordered",
+      "category": "event_streams",
+      "messageType": "mxaccess_gateway.v1.MxEvent",
+      "path": "event-streams/session-event-stream.json",
+      "expectation": "Clients preserve per-session event order and event family bodies exactly as emitted."
+    },
+    {
+      "id": "values.conversion-cases",
+      "category": "value_conversion",
+      "messageType": "mxaccess_gateway.v1.MxValue",
+      "path": "values/value-conversion-cases.json",
+      "expectation": "Clients expose typed projections and keep raw fallback metadata when conversion is incomplete."
+    },
+    {
+      "id": "statuses.conversion-cases",
+      "category": "status_conversion",
+      "messageType": "mxaccess_gateway.v1.MxStatusProxy",
+      "path": "statuses/status-conversion-cases.json",
+      "expectation": "Clients preserve every MXSTATUS_PROXY field, including raw category/source values."
+    },
+    {
+      "id": "auth.error-cases",
+      "category": "auth_errors",
+      "messageType": "client_behavior.v1.AuthErrorCase",
+      "path": "auth/auth-error-cases.json",
+      "expectation": "Clients map authentication and authorization failures distinctly and redact credentials."
+    },
+    {
+      "id": "timeout-cancel.expected-behavior",
+      "category": "timeout_cancel",
+      "messageType": "client_behavior.v1.TimeoutCancelCase",
+      "path": "timeout-cancel/timeout-cancel-cases.json",
+      "expectation": "Client cancellation stops waiting locally but does not imply an in-flight MXAccess COM call was aborted."
+    }
+  ]
+}
@@ -0,0 +1,41 @@
+{
+  "schemaVersion": 1,
+  "cases": [
+    {
+      "id": "ok.responding-lmx",
+      "status": {
+        "success": 1,
+        "category": "MX_STATUS_CATEGORY_OK",
+        "detectedBy": "MX_STATUS_SOURCE_RESPONDING_LMX",
+        "detail": 0,
+        "rawCategory": 0,
+        "rawDetectedBy": 0,
+        "diagnosticText": "OK"
+      }
+    },
+    {
+      "id": "security-error.requesting-lmx",
+      "status": {
+        "success": 0,
+        "category": "MX_STATUS_CATEGORY_SECURITY_ERROR",
+        "detectedBy": "MX_STATUS_SOURCE_REQUESTING_LMX",
+        "detail": 401,
+        "rawCategory": 8,
+        "rawDetectedBy": 2,
+        "diagnosticText": "Requesting LMX denied the secured operation."
+      }
+    },
+    {
+      "id": "raw-unknown-category",
+      "status": {
+        "success": 0,
+        "category": "MX_STATUS_CATEGORY_UNKNOWN",
+        "detectedBy": "MX_STATUS_SOURCE_UNKNOWN",
+        "detail": 65535,
+        "rawCategory": 99,
+        "rawDetectedBy": 77,
+        "diagnosticText": "Unknown native MXSTATUS_PROXY fields are preserved."
+      }
+    }
+  ]
+}
@@ -0,0 +1,27 @@
+{
+  "schemaVersion": 1,
+  "cases": [
+    {
+      "id": "unary-deadline-exceeded",
+      "operation": "Invoke",
+      "clientDeadline": "2s",
+      "grpcStatusCode": "DEADLINE_EXCEEDED",
+      "clientErrorCategory": "TimeoutError",
+      "gatewayWaitBehavior": "stops_waiting_for_reply",
+      "workerCommandBehavior": "continues_until_worker_reply_or_worker_fault",
+      "sessionExpectation": "session_state_is_unknown_until_follow_up_status_or_close",
+      "expectedClientAction": "issue GetSessionState or CloseSession before reusing handles"
+    },
+    {
+      "id": "stream-cancel",
+      "operation": "StreamEvents",
+      "clientDeadline": "5s",
+      "grpcStatusCode": "CANCELLED",
+      "clientErrorCategory": "CancelledError",
+      "gatewayWaitBehavior": "stops_streaming_to_that_call",
+      "workerCommandBehavior": "does_not_cancel_worker_session",
+      "sessionExpectation": "session_remains_ready_if_worker_stays_healthy",
+      "expectedClientAction": "open a new StreamEvents call with the last observed worker sequence"
+    }
+  ]
+}
@@ -0,0 +1,85 @@
+{
+  "schemaVersion": 1,
+  "cases": [
+    {
+      "id": "bool.true",
+      "expectedKind": "boolValue",
+      "value": {
+        "dataType": "MX_DATA_TYPE_BOOLEAN",
+        "variantType": "VT_BOOL",
+        "boolValue": true
+      }
+    },
+    {
+      "id": "int64.large",
+      "expectedKind": "int64Value",
+      "value": {
+        "dataType": "MX_DATA_TYPE_INTEGER",
+        "variantType": "VT_I8",
+        "int64Value": "9223372036854770000"
+      }
+    },
+    {
+      "id": "timestamp.utc",
+      "expectedKind": "timestampValue",
+      "value": {
+        "dataType": "MX_DATA_TYPE_TIME",
+        "variantType": "VT_DATE",
+        "timestampValue": "2026-01-01T00:00:04Z"
+      }
+    },
+    {
+      "id": "string-array",
+      "expectedKind": "arrayValue",
+      "value": {
+        "dataType": "MX_DATA_TYPE_STRING",
+        "arrayValue": {
+          "elementDataType": "MX_DATA_TYPE_STRING",
+          "variantType": "VT_ARRAY|VT_BSTR",
+          "dimensions": [
+            2
+          ],
+          "stringValues": {
+            "values": [
+              "alpha",
+              "beta"
+            ]
+          }
+        }
+      }
+    },
+    {
+      "id": "raw-fallback.variant",
+      "expectedKind": "rawValue",
+      "value": {
+        "dataType": "MX_DATA_TYPE_UNKNOWN",
+        "variantType": "VT_RECORD",
+        "rawDiagnostic": "No lossless typed projection exists for this VARIANT.",
+        "rawDataType": 32767,
+        "rawValue": "AQIDBAU="
+      }
+    },
+    {
+      "id": "raw-array-fallback",
+      "expectedKind": "arrayValue",
+      "value": {
+        "dataType": "MX_DATA_TYPE_UNKNOWN",
+        "arrayValue": {
+          "elementDataType": "MX_DATA_TYPE_UNKNOWN",
+          "variantType": "VT_ARRAY|VT_VARIANT",
+          "dimensions": [
+            2
+          ],
+          "rawDiagnostic": "Array elements contain mixed VARIANT types.",
+          "rawElementDataType": 32767,
+          "rawValues": {
+            "values": [
+              "AAE=",
+              "AgM="
+            ]
+          }
+        }
+      }
+    }
+  ]
+}
@@ -0,0 +1,28 @@
+{
+  "family": "MX_EVENT_FAMILY_ON_DATA_CHANGE",
+  "sessionId": "session-fixture",
+  "serverHandle": 12,
+  "itemHandle": 34,
+  "value": {
+    "dataType": "MX_DATA_TYPE_INTEGER",
+    "variantType": "VT_I4",
+    "int32Value": 123
+  },
+  "quality": 192,
+  "sourceTimestamp": "2026-01-01T00:00:00Z",
+  "statuses": [
+    {
+      "success": 1,
+      "category": "MX_STATUS_CATEGORY_OK",
+      "detectedBy": "MX_STATUS_SOURCE_RESPONDING_LMX",
+      "detail": 0,
+      "rawCategory": 0,
+      "rawDetectedBy": 0,
+      "diagnosticText": "OK"
+    }
+  ],
+  "workerSequence": "1",
+  "workerTimestamp": "2026-01-01T00:00:00.010Z",
+  "gatewayReceiveTimestamp": "2026-01-01T00:00:00.015Z",
+  "onDataChange": {}
+}
@@ -0,0 +1,18 @@
+{
+  "sessionId": "session-fixture",
+  "backendName": "mxaccess-worker",
+  "workerProcessId": 1234,
+  "workerProtocolVersion": 1,
+  "gatewayProtocolVersion": 1,
+  "capabilities": [
+    "unary-open-session",
+    "unary-close-session",
+    "unary-invoke",
+    "server-stream-events"
+  ],
+  "defaultCommandTimeout": "30s",
+  "protocolStatus": {
+    "code": "PROTOCOL_STATUS_CODE_OK",
+    "message": "Session opened."
+  }
+}
@@ -0,0 +1,10 @@
+{
+  "sessionId": "session-fixture",
+  "clientCorrelationId": "fixture-register-1",
+  "command": {
+    "kind": "MX_COMMAND_KIND_REGISTER",
+    "register": {
+      "clientName": "fixture-client"
+    }
+  }
+}
@@ -0,0 +1,27 @@
+{
+  "schemaVersion": 1,
+  "contractName": "mxaccess-gateway",
+  "gatewayProtocolVersion": 1,
+  "workerProtocolVersion": 1,
+  "protoRoot": "src/MxGateway.Contracts/Protos",
+  "sourceFiles": [
+    {
+      "path": "mxaccess_gateway.proto",
+      "role": "public_gateway"
+    },
+    {
+      "path": "mxaccess_worker.proto",
+      "role": "gateway_worker_ipc"
+    }
+  ],
+  "descriptorSet": "clients/proto/descriptors/mxaccessgw-client-v1.protoset",
+  "fixtureRoot": "clients/proto/fixtures/golden",
+  "behaviorFixtureRoot": "clients/proto/fixtures/behavior",
+  "generatedOutputs": {
+    "dotnet": "clients/dotnet/generated",
+    "go": "clients/go/internal/generated",
+    "rust": "clients/rust/src/generated",
+    "python": "clients/python/src/mxgateway/generated",
+    "java": "clients/java/src/main/generated"
+  }
+}
@@ -0,0 +1 @@
+
@@ -0,0 +1 @@
+
@@ -0,0 +1,106 @@
+# Client Behavior Fixtures
+
+Client behavior fixtures define the shared expectations used by the official
+.NET, Go, Rust, Python, and Java clients. They keep wrapper behavior aligned
+while each language exposes idiomatic APIs over the same protobuf contract.
+
+## Fixture Set
+
+The fixture manifest is `clients/proto/fixtures/behavior/manifest.json`.
+`clients/proto/proto-inputs.json` references the fixture root through
+`behaviorFixtureRoot` so generators and client test projects can discover the
+same files they use for descriptor inputs.
+
+The fixture set contains:
+
+- command reply protobuf JSON,
+- ordered event stream protobuf JSON samples,
+- `MxValue` conversion case sets,
+- `MxStatusProxy` conversion case sets,
+- authentication and authorization error expectations,
+- timeout and cancellation behavior expectations.
+
+Protobuf message fixtures use protobuf JSON field names and enum values. Files
+that describe client wrapper behavior use explicit JSON fields instead of a
+proto message because those expectations apply above the generated transport
+types.
+
+## Command Replies
+
+Command reply fixtures live in
+`clients/proto/fixtures/behavior/command-replies/`. They parse as
+`mxaccess_gateway.v1.MxCommandReply`.
+
+Clients use these fixtures to verify that successful and failed MXAccess
+commands both carry the full reply details:
+
+- `protocolStatus`,
+- `hresult`,
+- `returnValue`,
+- repeated `statuses`,
+- method-specific reply payloads when MXAccess returns out parameters.
+
+MXAccess failures remain command replies when the gateway reached the worker and
+the worker captured HRESULT or `MXSTATUS_PROXY` details. Client wrappers should
+map those replies to rich command errors without discarding the raw reply.
+
+## Event Streams
+
+Event stream fixtures live in
+`clients/proto/fixtures/behavior/event-streams/`. Each file contains an ordered
+`events` array whose entries parse as `mxaccess_gateway.v1.MxEvent`.
+
+Clients use these fixtures to verify that stream helpers preserve
+`workerSequence` order and expose each native event family:
+
+- `OnDataChange`,
+- `OnWriteComplete`,
+- `OperationComplete`,
+- `OnBufferedDataChange`.
+
+Wrappers must not reorder, coalesce, or drop events while reading the fixture.
+
+## Value And Status Conversion
+
+Value fixtures live in `clients/proto/fixtures/behavior/values/`. Each case
+contains a `value` object that parses as `mxaccess_gateway.v1.MxValue`.
+
+Status fixtures live in `clients/proto/fixtures/behavior/statuses/`. Each case
+contains a `status` object that parses as
+`mxaccess_gateway.v1.MxStatusProxy`.
+
+Clients use these fixtures to verify typed projections and raw fallback
+behavior. A language helper may expose native booleans, integers, strings,
+arrays, and timestamps, but it must keep `rawDiagnostic`, raw data type fields,
+and raw byte payloads accessible when conversion is incomplete.
+
+## Auth, Timeout, And Cancel Behavior
+
+Authentication fixtures live in `clients/proto/fixtures/behavior/auth/`. They
+separate `UNAUTHENTICATED` from `PERMISSION_DENIED` so clients map missing or
+invalid credentials differently from missing scopes. Expected output strings
+contain only redacted credentials.
+
+Timeout and cancellation fixtures live in
+`clients/proto/fixtures/behavior/timeout-cancel/`. They document that canceling
+or timing out a client call stops the client from waiting, but it does not abort
+an in-flight MXAccess COM call on the worker STA. Clients should follow up with
+`GetSessionState` or `CloseSession` before reusing handles after an uncertain
+command timeout.
+
+## Validation
+
+Run the fixture validation tests after changing the behavior fixture set:
+
+```bash
+powershell -ExecutionPolicy Bypass -File scripts/validate-client-behavior-fixtures.ps1
+```
+
+The script runs the focused C# contract tests that parse all protobuf JSON
+fixtures and validate deterministic wrapper expectation files.
+
+## Related Documentation
+
+- [Client Proto Generation](./client-proto-generation.md)
+- [Client Libraries Detailed Design](./client-libraries-design.md)
+- [Protobuf Contracts](./Contracts.md)
@@ -18,6 +18,12 @@ event, value, and status shapes.
 Generated C# output is written to `src/MxGateway.Contracts/Generated/`. Do not
 hand-edit generated files.

+Client generation inputs are published through
+`clients/proto/proto-inputs.json` and the descriptor set under
+`clients/proto/descriptors/`. See
+[Client Proto Generation](./client-proto-generation.md) for language-specific
+generation inputs, output directories, and golden protobuf JSON fixtures.
+
 ## Generation

 Run the contracts build to regenerate C# protobuf and gRPC code:
@@ -39,8 +45,15 @@ gateway and test projects:
 dotnet build src/MxGateway.sln
 ```

+Regenerate the client descriptor after changing either `.proto` file:
+
+```bash
+powershell -ExecutionPolicy Bypass -File scripts/publish-client-proto-inputs.ps1
+```
+
 ## Related Documentation

+- [Client Proto Generation](./client-proto-generation.md)
 - [Gateway Process Detailed Design](./gateway-process-design.md)
 - [MXAccess Worker Instance Detailed Design](./mxaccess-worker-instance-design.md)
 - [Protobuf Style Guide](./style-guides/ProtobufStyleGuide.md)
@@ -0,0 +1,58 @@
+# Gateway Testing
+
+Gateway tests run without installed MXAccess by using fake workers, fake
+transports, and in-process gRPC service fakes. Live MXAccess verification belongs
+in opt-in integration tests because it depends on installed COM components and
+provider state.
+
+## Fake Worker Harness
+
+`FakeWorkerHarness` in `src/MxGateway.Tests/Gateway/Workers/Fakes/` provides an
+in-process worker side for named-pipe IPC tests. It uses the same
+`WorkerFrameReader`, `WorkerFrameWriter`, and `WorkerEnvelope` contract as the
+gateway so tests exercise real frame validation and worker-client state changes.
+
+Use the harness when a gateway or session test needs worker behavior without
+starting `MxGateway.Worker.exe` or loading MXAccess COM. The harness scripts:
+
+- `WorkerHello` and `WorkerReady` startup,
+- command replies with matching correlation ids,
+- ordered `WorkerEvent` frames,
+- `WorkerFault` frames,
+- shutdown acknowledgements,
+- malformed protobuf payloads and oversized frame headers,
+- slow or hung workers by withholding a reply.
+
+Session-level tests can connect the harness to the pipe created by
+`SessionWorkerClientFactory` with `ConnectToGatewayPipeAsync`. Lower-level
+`WorkerClient` tests can use `CreateConnectedPairAsync` to create both pipe ends
+inside the test.
+
+`GatewayEndToEndFakeWorkerSmokeTests` composes the real gRPC service,
+`SessionManager`, `SessionWorkerClientFactory`, `WorkerClient`, and
+`EventStreamService` with a scripted fake worker launcher. The smoke test covers
+`OpenSession`, `Register`, `AddItem`, `Advise`, one streamed `OnDataChange`
+event, and `CloseSession` without loading MXAccess COM.
+
+## Focused Commands
+
+Run the fake worker tests after changing gateway worker IPC, session startup, or
+event streaming behavior:
+
+```bash
+dotnet test src/MxGateway.Tests/MxGateway.Tests.csproj --filter FullyQualifiedName~FakeWorkerHarnessTests
+dotnet test src/MxGateway.Tests/MxGateway.Tests.csproj --filter FullyQualifiedName~SessionWorkerClientFactoryFakeWorkerTests
+dotnet test src/MxGateway.Tests/MxGateway.Tests.csproj --filter FullyQualifiedName~GatewayEndToEndFakeWorkerSmokeTests
+```
+
+Run the gateway test project after shared gateway test infrastructure changes:
+
+```bash
+dotnet test src/MxGateway.Tests/MxGateway.Tests.csproj
+```
+
+## Related Documentation
+
+- [Gateway Process Design](./gateway-process-design.md)
+- [Worker Frame Protocol](./WorkerFrameProtocol.md)
+- [MXAccess Worker Instance Detailed Design](./mxaccess-worker-instance-design.md)
@@ -26,6 +26,12 @@ Language-specific plans:
 - `docs/clients-python-design.md`
 - `docs/clients-java-design.md`

+Shared generation inputs:
+
+- `docs/client-proto-generation.md`
+- `docs/ClientBehaviorFixtures.md`
+- `clients/proto/proto-inputs.json`
+
 Language style guides:

 | Client | Style guide |
@@ -305,6 +311,11 @@ CLI output should support JSON for automated tests.
 Unit tests must run without a live gateway. Use fake gRPC services, mock
 transports, or generated test servers depending on language.

+Shared behavior fixtures live in `clients/proto/fixtures/behavior`. Every
+client should include tests that load the fixture manifest and verify wrapper
+behavior against the common command reply, event stream, value conversion,
+status conversion, auth error, and timeout/cancel cases.
+
 Required unit test areas:

 - options parsing,
@@ -365,6 +376,16 @@ examples/
 Generated code should be reproducible from `src/MxGateway.Contracts/Protos/`.
 Do not hand-edit generated code.

+The stable client proto manifest defines the generated-code directories:
+
+```text
+clients/dotnet/generated
+clients/go/internal/generated
+clients/rust/src/generated
+clients/python/src/mxgateway/generated
+clients/java/src/main/generated
+```
+
 ## Versioning

 All clients should expose:
@@ -0,0 +1,155 @@
+# Client Proto Generation
+
+This document defines the stable protobuf inputs that official clients use to
+generate language-specific gRPC bindings. The checked-in `.proto` files remain
+the source of truth so clients do not drift from the gateway and worker
+contracts.
+
+## Stable Inputs
+
+The stable client input manifest is `clients/proto/proto-inputs.json`. It
+records:
+
+- the public gateway protocol version,
+- the worker IPC protocol version,
+- the protobuf import root,
+- the public and worker source files,
+- the descriptor set path,
+- golden fixture locations,
+- behavior fixture locations,
+- generated-code output directories for each planned client.
+
+The source files listed by the manifest are:
+
+- `src/MxGateway.Contracts/Protos/mxaccess_gateway.proto`
+- `src/MxGateway.Contracts/Protos/mxaccess_worker.proto`
+
+`mxaccess_gateway.proto` defines the public gRPC service and shared DTOs.
+`mxaccess_worker.proto` is included in the descriptor because worker-aware
+tests and fake-worker clients need the same command, reply, event, value, and
+status shapes.
+
+## Protocol Version
+
+`GatewayContractInfo.GatewayProtocolVersion` is the public gateway protocol
+version. `OpenSessionReply.gateway_protocol_version` returns the same value so
+clients can compare their generated bindings against the gateway before issuing
+MXAccess commands.
+
+`GatewayContractInfo.WorkerProtocolVersion` remains the gateway-to-worker IPC
+protocol version. It is also present in `OpenSessionReply` because parity
+fixtures and fake-worker tests need to know the worker contract used by the
+session.
+
+## Descriptor Publishing
+
+Run this command after changing either source `.proto` file or the client proto
+manifest:
+
+```powershell
+scripts/publish-client-proto-inputs.ps1
+```
+
+The script writes
+`clients/proto/descriptors/mxaccessgw-client-v1.protoset` with imports and
+source information included. The descriptor is a generated artifact; do not edit
+it by hand.
+
+Use the check mode in CI or before committing:
+
+```powershell
+scripts/publish-client-proto-inputs.ps1 -Check
+```
+
+`-Check` rebuilds the descriptor in a temporary path and fails when the checked
+in descriptor is stale.
+
+## Output Directories
+
+The manifest declares these generated-code directories:
+
+| Client | Directory |
+|--------|-----------|
+| .NET | `clients/dotnet/generated` |
+| Go | `clients/go/internal/generated` |
+| Rust | `clients/rust/src/generated` |
+| Python | `clients/python/src/mxgateway/generated` |
+| Java | `clients/java/src/main/generated` |
+
+Only generator output belongs in these directories. Handwritten client wrappers
+belong in the language-specific source trees created by the client scaffold
+issues.
+
+## Language Generation Inputs
+
+All generators use `src/MxGateway.Contracts/Protos` as the protobuf import
+root. The checked-in descriptor is available when a language build prefers a
+descriptor input, but the `.proto` files remain canonical.
+
+.NET generation currently runs through the contracts project:
+
+```powershell
+dotnet build src/MxGateway.Contracts/MxGateway.Contracts.csproj
+```
+
+Future .NET client projects may either reference `MxGateway.Contracts` or
+generate client-local files into `clients/dotnet/generated` with `Grpc.Tools`.
+
+Go clients should generate `mxaccess_gateway.proto` and
+`mxaccess_worker.proto` into `clients/go/internal/generated` with
+`protoc-gen-go` and `protoc-gen-go-grpc`. Keep generated packages internal
+unless the wrapper API intentionally exposes raw protobuf messages.
+
+Rust clients should use `tonic-build` or the selected protobuf generator from
+the Rust client build script, with generated modules placed under
+`clients/rust/src/generated` or included from the build output according to the
+client crate design.
+
+Python clients should use `grpc_tools.protoc` and write generated modules under
+`clients/python/src/mxgateway/generated` so imports stay separate from
+handwritten async wrappers.
+
+Java clients should use the Gradle protobuf plugin and write generated sources
+under `clients/java/src/main/generated`. The Java client scaffold owns the
+Gradle plugin versions and source-set wiring.
+
+## Golden Fixtures
+
+Golden protobuf JSON fixtures live in `clients/proto/fixtures/golden`. They
+exercise payloads that every language client must parse:
+
+- `open-session-reply.ok.json`
+- `register-command-request.json`
+- `on-data-change-event.json`
+
+The fixtures use protobuf JSON field names and enum values. Contract tests parse
+them with the generated C# types so schema drift is caught before client
+generation work starts.
+
+## Behavior Fixtures
+
+Cross-language behavior fixtures live in
+`clients/proto/fixtures/behavior`. The manifest
+`clients/proto/fixtures/behavior/manifest.json` lists command replies, ordered
+event stream samples, value conversion cases, status conversion cases, auth
+error expectations, and timeout/cancel expectations.
+
+The behavior fixtures let each generated client wrapper test the same
+expectations without a live gateway. Protobuf message fixtures parse with the
+generated types. Auth and timeout/cancel files describe wrapper behavior above
+the generated transport layer, including credential redaction and the rule that
+client cancellation does not abort an in-flight MXAccess COM call.
+
+Run the focused validation script after changing these fixtures:
+
+```powershell
+scripts/validate-client-behavior-fixtures.ps1
+```
+
+## Related Documentation
+
+- [Protobuf Contracts](./Contracts.md)
+- [Client Libraries Detailed Design](./client-libraries-design.md)
+- [Client Behavior Fixtures](./ClientBehaviorFixtures.md)
+- [Client Libraries Implementation Plan](./implementation-plan-clients.md)
+- [Protobuf Style Guide](./style-guides/ProtobufStyleGuide.md)
@@ -34,9 +34,13 @@ SignalR circuit. Bootstrap is sufficient for a basic dashboard.

 ## Hosting Model

-The dashboard is hosted by `MxGateway.Server` alongside the gRPC API.
+The dashboard is hosted by `MxGateway.Server` alongside the gRPC API. When
+`MxGateway:Dashboard:Enabled` is `true`, `MapGatewayDashboard()` maps the
+configured `Dashboard:PathBase` to the Blazor Server app and maps the login,
+logout, and access-denied HTTP endpoints beside it. When dashboard hosting is
+disabled, those routes are not mapped.

-Suggested endpoint layout:
+Endpoint layout:

 ```text
 /dashboard
@@ -45,7 +49,7 @@ Suggested endpoint layout:
 /dashboard/workers
 /dashboard/events
 /dashboard/settings
-/_blazor
+/dashboard/_blazor
 ```

 The app should redirect `/` to `/dashboard` only if the deployment wants the
@@ -59,9 +63,10 @@ MxGateway.Server
    Components/
      App.razor
      Routes.razor
+      DashboardPageBase.cs
+      DashboardDisplay.cs
      Layout/
        DashboardLayout.razor
-        NavMenu.razor
      Pages/
        DashboardHome.razor
        SessionsPage.razor
@@ -69,26 +74,21 @@ MxGateway.Server
        WorkersPage.razor
        EventsPage.razor
        SettingsPage.razor
-      Components/
+      Shared/
        MetricCard.razor
-        SessionTable.razor
-        WorkerTable.razor
-        EventRatePanel.razor
+        StatusBadge.razor
        FaultList.razor
-    Services/
-      DashboardSnapshotService.cs
-      DashboardUpdateHub.cs
-      DashboardAuthorization.cs
-    Models/
-      DashboardSnapshot.cs
-      SessionSummary.cs
-      WorkerSummary.cs
-      MetricSummary.cs
+    DashboardSnapshotService.cs
+    DashboardAuthorizationHandler.cs
+    DashboardAuthenticator.cs
+    DashboardSnapshot.cs
+    DashboardSessionSummary.cs
+    DashboardWorkerSummary.cs
+    DashboardMetricSummary.cs
 ```

-`DashboardUpdateHub` here means an internal application update service, not a
-separate public SignalR hub unless implementation proves one is needed. Blazor
-Server already uses SignalR for UI circuits.
+Blazor Server provides the SignalR circuit for UI updates. The implementation
+does not add a separate public dashboard hub.

 ## Dashboard Data Source

@@ -137,7 +137,7 @@ gateway internals.

 Use Blazor Server component state updates for real-time dashboard refresh.

-Recommended pattern:
+Implemented pattern:

 1. Page/component subscribes to `WatchSnapshotsAsync`.
 2. Snapshot service emits updates from a bounded channel or timer.
@@ -147,10 +147,8 @@ Recommended pattern:

 Default update cadence:

- immediate update on session create/close/fault,
- immediate update on worker fault,
 - periodic metrics refresh every 1 second,
- event-rate windows updated every 1 second.
+- event counters update on the next snapshot tick.

 Avoid pushing every MXAccess data-change event to the dashboard. Aggregate event
 counts and rates instead.
@@ -257,19 +255,18 @@ Do not show API key secrets or pepper values.

 ## Authentication And Authorization

-Dashboard access should use the same API-key authentication model as gRPC where
+Dashboard access uses the same API-key authentication model as gRPC where
 practical.

-Recommended v1 behavior:
+Implemented v1 behavior:

- dashboard disabled by default unless configured,
 - when enabled, require API key auth,
 - require `admin` scope for dashboard access,
- accept API key through a secure cookie established by a simple login form, or
-  through reverse-proxy/header configuration for local deployments,
- do not put API keys in query strings.
+- accept API key through a secure cookie established by a simple login form,
+- do not put API keys in query strings,
+- validate anti-forgery tokens for login and logout posts.

-Simplest implementation path:
+The implementation path is:

 1. Add `/dashboard/login`.
 2. User submits API key over HTTPS.
@@ -281,6 +278,13 @@ Simplest implementation path:
 For local development, allow an explicit `Dashboard:AllowAnonymousLocalhost`
 option. It must default to false.

+`DashboardAuthenticator` keeps API-key validation outside UI components. It
+formats the submitted key as a bearer authorization header for
+`IApiKeyVerifier`, rejects non-admin keys when `Dashboard:RequireAdminScope` is
+enabled, and creates the dashboard cookie principal without storing raw API key
+material. `DashboardAuthorizationHandler` enforces the cookie, admin-scope, and
+explicit loopback bypass decisions for all protected dashboard routes.
+
 ## Configuration

 Suggested configuration:
@@ -314,7 +318,9 @@ Suggested configuration:

 ## Styling

-Use Bootstrap utility classes and a small local stylesheet.
+The dashboard serves Bootstrap 5.3.3 assets from
+`src/MxGateway.Server/wwwroot/lib/bootstrap/` and local layout/status styling
+from `src/MxGateway.Server/wwwroot/css/dashboard.css`.

 Recommended visual language:

@@ -355,15 +361,18 @@ Integration tests should verify:

 ## Initial Implementation Slice

-The first dashboard slice should implement:
+The first dashboard slice implements:

 1. Blazor Server hosting in `MxGateway.Server`.
-2. Bootstrap static assets.
+2. local Bootstrap static assets.
 3. dashboard configuration binding.
 4. dashboard auth using API key login and HTTP-only cookie.
 5. read-only `DashboardSnapshotService`.
 6. home page with metric cards.
-7. sessions page with active session table.
+7. sessions page with active session table and session details.
 8. workers page with worker table.
-9. 1-second realtime refresh through Blazor Server.
-10. redaction tests for secrets.
+9. events page with aggregate counters.
+10. settings page with redacted effective configuration.
+11. periodic realtime refresh through Blazor Server.
+12. route-mapping tests, disabled-dashboard tests, auth tests, and snapshot
+    projection/redaction tests.
@@ -64,8 +64,8 @@ MxGateway.Server
  Configuration
  Grpc
    MxAccessGatewayService
-    RequestReplyMapper
-    EventMapper
+    MxAccessGrpcRequestValidator
+    MxAccessGrpcMapper
  Dashboard
    Pages
    Components
@@ -105,6 +105,15 @@ service MxAccessGateway {
 }
 ```

+`MxAccessGatewayService` implements these public RPCs in the gateway process.
+It validates public requests with `MxAccessGrpcRequestValidator`, delegates
+session lifecycle and command routing to `ISessionManager`, and maps worker
+command replies and events through `MxAccessGrpcMapper`. Session lookup,
+validation, and worker transport failures become gRPC status errors. MXAccess
+method replies that reached the worker remain `MxCommandReply` payloads so
+HRESULT values, status arrays, and method-specific reply fields survive
+transport boundaries.
+
 Add this later only after the command and event model is stable:

 ```protobuf
@@ -197,13 +206,23 @@ accounting and a clear fan-out policy.
 Behavior:

 1. Validate session id and authorize event access.
-2. Attach a stream cursor to the session event channel.
-3. Send events in worker sequence order.
-4. Stop on client cancellation, session close, or session fault.
-5. Emit a terminal status when the session faults if gRPC status alone cannot
+2. Attach the single active subscriber lease for the session.
+3. Read worker events into a bounded public stream queue.
+4. Send events in worker sequence order.
+5. Stop on client cancellation, session close, or session fault.
+6. Emit a terminal status when the session faults if gRPC status alone cannot
   preserve the required details.

-The gateway must not reorder events from one worker.
+`EventStreamService` owns subscriber tracking and public stream backpressure.
+The default policy allows one active subscriber per session. A second subscriber
+is rejected with `EventSubscriberAlreadyActive`. Stream cancellation releases
+the subscriber lease so a later stream can attach to the session.
+
+The gateway must not reorder events from one worker. `EventStreamService` writes
+mapped events to a bounded first-in, first-out queue and faults the session with
+`EventQueueOverflow` if the queue fills. The gateway does not synthesize
+`OperationComplete`; it forwards that family only when the worker reports a
+native MXAccess `OperationComplete` event.

 ## Web Dashboard

@@ -330,6 +349,20 @@ The worker remains authoritative for MXAccess handles. The gateway may keep a
 shadow state for diagnostics, but it must not invent, rewrite, or recycle
 MXAccess handles.

+`SessionManager` owns the current in-memory session registry. It allocates a
+session id, creates the worker pipe name and nonce, registers the session before
+worker startup, and removes the session if startup fails. A successful
+`OpenSession` attaches the ready `IWorkerClient` and transitions the session to
+`Ready`.
+
+Only `Ready` sessions accept command and event operations. `CloseSession` is
+idempotent for sessions still known to the registry: the first close shuts down
+the worker, and later closes return the final `Closed` state. Lease handling is
+exposed as a session hook so a monitor can close expired sessions without
+embedding lease policy in the worker client. Gateway shutdown walks the
+registry, closes each known session, and kills a worker if graceful shutdown
+fails.
+
 ## Worker Launch

 The gateway should launch the worker using explicit configuration:
@@ -411,7 +444,7 @@ session ids as protocol faults and close the session.

 `WorkerClient` is the gateway-side object that owns one worker connection.

-Suggested public shape:
+Current public shape:

 ```csharp
 public interface IWorkerClient : IAsyncDisposable
@@ -419,6 +452,7 @@ public interface IWorkerClient : IAsyncDisposable
    string SessionId { get; }
    int? ProcessId { get; }
    WorkerClientState State { get; }
+    DateTimeOffset LastHeartbeatAt { get; }

    Task StartAsync(CancellationToken cancellationToken);
    Task<WorkerCommandReply> InvokeAsync(
@@ -438,12 +472,17 @@ Internally it owns:
 - pipe stream,
 - read loop,
 - write loop,
- bounded outbound command/control channel,
+- outbound command/control channel serialized by the write loop,
 - bounded inbound event channel,
 - pending command dictionary keyed by correlation id,
 - heartbeat monitor,
 - terminal fault source.

+`StartAsync` sends `GatewayHello`, verifies the `WorkerHello` protocol version
+and nonce, waits for `WorkerReady`, and only then exposes `Ready` state. The
+read loop starts after readiness so the handshake has a single owner for its
+ordered frames.
+
 ### Read Loop

 The read loop:
@@ -555,7 +594,8 @@ worker MXAccess event
  -> worker outbound event queue
  -> worker pipe writer
  -> gateway read loop
-  -> session event channel
+  -> worker client event queue
+  -> EventStreamService bounded stream queue
  -> gRPC StreamEvents
 ```

@@ -569,13 +609,15 @@ The gateway should record:

 Default backpressure policy for parity testing should be fail-fast:

-1. If the session event channel fills, fault the session.
+1. If the worker client event queue fills, fault the worker client.
+2. If the public stream queue fills, fault the gateway session.
 2. Preserve the overflow details in logs and metrics.
 3. Do not silently drop data-change events.

-Do not set a production event-rate target before measurement. Emit event rate,
-queue depth, stream send latency, and overflow metrics. Later production modes
-may support explicit coalescing by item handle as an opt-in behavior.
+Do not set a production event-rate target before measurement. `GatewayMetrics`
+records received event counts by family, queue depth, stream disconnects, and
+overflow counts. Later production modes may support explicit coalescing by item
+handle as an opt-in behavior.

 The gateway should not synthesize `OperationComplete` from write completion,
 command replies, ASB completion queues, or completion-only status frames. Forward
@@ -612,6 +654,25 @@ hashes the presented secret, and compares the stored and presented hashes with
 results distinguish malformed credentials, missing keys, revoked keys, missing
 pepper configuration, and hash mismatch for internal authorization handling.

+`GatewayGrpcAuthorizationInterceptor` enforces this authentication model for
+public gRPC calls. Missing, malformed, revoked, unknown, or mismatched keys fail
+with `Unauthenticated`. Authenticated calls missing the scope required by the
+RPC fail with `PermissionDenied`. The interceptor applies to unary calls and
+server-streaming calls and stores the authenticated `ApiKeyIdentity` in
+`IGatewayRequestIdentityAccessor` for the duration of the request handler.
+`Authentication:Mode` set to `Disabled` bypasses API-key verification for local
+development only.
+
+Dashboard authentication reuses the API-key verifier and scope model. The
+dashboard login endpoint accepts the key in a form post, checks `admin` scope
+when `Dashboard:RequireAdminScope` is enabled, and signs in with the
+`MxGateway.Dashboard` cookie scheme. The cookie is HTTP-only, secure, strict
+SameSite, and scoped with the `__Host-MxGatewayDashboard` name. Logout clears
+that cookie. Login and logout posts use anti-forgery validation, and dashboard
+API keys are not accepted in query strings. `Dashboard:AllowAnonymousLocalhost`
+allows only loopback requests to bypass the dashboard cookie requirement and
+defaults to `false`.
+
 Recommended scopes:

 - `session:open`
@@ -677,6 +738,20 @@ Commands requiring authorization:
 - worker shutdown diagnostics,
 - metadata queries if they expose sensitive plant structure.

+Current gRPC scope mapping:
+
+- `OpenSession` requires `session:open`.
+- `CloseSession` requires `session:close`.
+- `StreamEvents` and `DrainEvents` require `events:read`.
+- read-style MXAccess commands such as `Register`, `AddItem`, `Advise`, and
+  `Ping` require `invoke:read`.
+- `Write` and `Write2` require `invoke:write`.
+- `WriteSecured`, `WriteSecured2`, and `AuthenticateUser` require
+  `invoke:secure`.
+- metadata commands such as `ArchestrAUserToId`, `GetSessionState`, and
+  `GetWorkerInfo` require `metadata:read`.
+- `ShutdownWorker` requires `admin`.
+
 ### Worker IPC

 Named pipes should be local only. Pipe ACLs should restrict access to:
@@ -816,9 +891,17 @@ behavior unless an explicit non-parity backend is designed.
 Gateway tests should be able to run without installed MXAccess by using fake
 workers and fake transports.

+Use `FakeWorkerHarness` for tests that need real gateway-to-worker framing,
+handshake, command, event, fault, or malformed-protocol behavior without loading
+MXAccess COM. See [Gateway Testing](./GatewayTesting.md) for the harness scope
+and focused test commands.
+
 Focused tests:

 - session state transitions,
+- gRPC API-key authentication for unary and streaming calls,
+- gRPC scope mapping for sessions, invokes, events, metadata, and admin
+  commands,
 - worker startup failures,
 - protocol version mismatch,
 - malformed frame handling,
@@ -189,6 +189,8 @@ Tests:

 Labels: `area:worker`, `type:feature`, `priority:p0`

+Status: implemented.
+
 Deliverables:

 - `Register`,
@@ -216,6 +218,8 @@ Live tests:

 Labels: `area:worker`, `type:feature`, `priority:p0`

+Status: implemented.
+
 Deliverables:

 - `AddItem`,
@@ -273,6 +277,8 @@ Live tests:

 Labels: `area:worker`, `type:feature`, `priority:p0`

+Status: implemented.
+
 Deliverables:

 - handlers for `OnDataChange`,
@@ -447,4 +453,3 @@ Acceptance criteria:

 - each public method has planned parity fixture or documented gap,
 - gateway results preserve HRESULT/status/value/event shape.
-
@@ -250,6 +250,17 @@ The loop should update a heartbeat timestamp after:
 - finishing a command,
 - processing an MXAccess event.

+`StaRuntime` implements this runtime boundary in the worker. It starts one
+background thread named `MxGateway.Worker.STA`, sets it to `ApartmentState.STA`,
+initializes COM through `StaComApartmentInitializer`, and runs
+`StaMessagePump`. Commands are scheduled through `InvokeAsync`; the command
+queue signals an `AutoResetEvent` so `MsgWaitForMultipleObjectsEx` can wake the
+STA without busy-waiting. `LastActivityUtc` records pump, command, startup, and
+shutdown activity so the future heartbeat/watchdog can report whether the STA
+is still responsive. Shutdown marks the runtime as closing, wakes the pump,
+rejects new commands, cancels queued work, uninitializes COM on the STA, and
+waits for the thread to exit.
+
 ## COM Creation

 The MXAccess analysis source at `C:\Users\dohertj2\Desktop\mxaccess` identifies
@@ -278,6 +289,16 @@ The worker should reference the interop assembly and instantiate
 `LMXProxyServerClass` on the dedicated STA thread. Keep the ProgID and assembly
 path configurable for diagnostics, but this COM class is the v1 default.

+`MxAccessStaSession` owns the initial COM creation path. It starts `StaRuntime`,
+creates `LMXProxyServerClass` through `MxAccessComObjectFactory` on the STA,
+attaches `MxAccessBaseEventSink`, and returns `WorkerReady` only after those
+steps succeed. `MxAccessSession` keeps the raw COM object private, records the
+STA managed thread id that created it, detaches the base event sink during
+disposal, and releases the COM reference on the STA. After creation,
+`MxAccessStaSession` owns a `StaCommandDispatcher` backed by
+`MxAccessCommandExecutor`; `DispatchAsync` queues contract commands back to the
+same STA instead of exposing the COM object to callers.
+
 Creation rules:

 - Create COM object only on the STA.
@@ -295,6 +316,11 @@ If COM creation fails, the worker should send a structured fault with:
 - worker process id,
 - session id.

+`WorkerPipeSession` maps startup exceptions from this path to
+`WorkerFaultCategory.MxaccessCreationFailed`, includes the captured HRESULT
+when the exception exposes one, and does not send `WorkerReady` after a failed
+COM creation attempt.
+
 ## Event Sink

 The worker must subscribe to every public MXAccess event family:
@@ -322,9 +348,28 @@ Event handling rules:
 - Enqueue to the outbound event queue.
 - Return quickly to preserve message pumping.

-If event conversion throws, catch it inside the event handler, enqueue a
-structured `WorkerFault` or diagnostic event, and keep the worker alive only if
-the fault policy allows it.
+`MxAccessBaseEventSink` implements the COM connection-point handlers and keeps
+the handlers limited to event argument conversion plus enqueue. It uses
+`MxAccessEventMapper` to create `MxEvent` DTOs for `OnDataChange`,
+`OnWriteComplete`, `OperationComplete`, and `OnBufferedDataChange`. The mapper
+converts scalar and array values through `VariantConverter`, converts
+`MXSTATUS_PROXY[]` through `MxStatusProxyConverter`, and maps installed
+`MxDataType` values to the public protobuf enum while preserving the raw data
+type on buffered events. `OperationComplete` is only emitted from the native
+`OperationComplete` handler; write completion does not synthesize it.
+
+`MxAccessEventQueue` is the bounded outbound event queue for one worker
+session. It assigns the monotonic `WorkerSequence` and `WorkerTimestamp` when an
+event is accepted, preserving the order in which MXAccess handlers enqueue
+events. The default capacity is `10000`. When the queue reaches capacity it
+records a `WorkerFaultCategory.QueueOverflow` fault and rejects further events.
+The event handler catches conversion and enqueue failures, records the first
+fault on the queue, and returns to the STA message pump instead of writing to
+the pipe.
+
+If event conversion throws, catch it inside the event handler, record a
+structured `WorkerFault`, and keep the worker alive only if the fault policy
+allows it.

 ## Command Queue

@@ -391,6 +436,60 @@ Diagnostics:
 Implement method-specific dispatch instead of a generic string method invoker.
 Parity tests need stable command-specific request and reply shapes.

+`MxAccessCommandExecutor` implements the first command pair:
+
+- `Register` calls `LMXProxyServerClass.Register` with the requested client
+  name and preserves the returned server handle in both `ReturnValue` and
+  `RegisterReply.ServerHandle`.
+- `Unregister` calls `LMXProxyServerClass.Unregister` with the requested server
+  handle. The reply has no method-specific payload because the public MXAccess
+  method returns `void`.
+
+Both commands set `Hresult` to `0` only after the COM call returns normally.
+COM exceptions flow through `StaCommandDispatcher`, which captures the thrown
+HRESULT and converts the reply to `ProtocolStatusCode.MxaccessFailure`.
+`MxAccessStaSession.GetRegisteredServerHandlesAsync` returns an STA-read
+snapshot of tracked server handles for diagnostics and future cleanup logic.
+
+`MxAccessCommandExecutor` also implements the item lifecycle commands:
+
+- `AddItem` calls `LMXProxyServerClass.AddItem` with the requested server
+  handle and item definition. It preserves the returned item handle in both
+  `ReturnValue` and `AddItemReply.ItemHandle`.
+- `AddItem2` calls `LMXProxyServerClass.AddItem2` with the requested server
+  handle, item definition, and context string. The context string is passed to
+  MXAccess exactly as received.
+- `RemoveItem` calls `LMXProxyServerClass.RemoveItem` with the requested server
+  handle and item handle. The reply has no method-specific payload because the
+  public MXAccess method returns `void`.
+
+The worker records item handles only after `AddItem` or `AddItem2` returns
+normally, and removes item handles only after `RemoveItem` returns normally.
+The registry does not prevalidate server or item handles, so invalid and
+cross-server handle behavior remains owned by MXAccess. COM exceptions continue
+through `StaCommandDispatcher`, which preserves the HRESULT and leaves
+diagnostic registry state unchanged for failed cleanup calls.
+
+`MxAccessCommandExecutor` implements advice lifecycle commands on the same STA
+path:
+
+- `Advise` calls `LMXProxyServerClass.Advise` with the requested server handle
+  and item handle.
+- `AdviseSupervisory` calls `LMXProxyServerClass.AdviseSupervisory` with the
+  requested server handle and item handle. This remains a distinct command from
+  plain `Advise` even though observed scalar captures share the same lower-level
+  subscription body.
+- `UnAdvise` calls `LMXProxyServerClass.UnAdvise` with the requested server
+  handle and item handle.
+
+The worker records plain and supervisory advice separately only after the COM
+call returns normally. Successful `UnAdvise` removes all tracked advice for the
+server and item pair because the public MXAccess cleanup method has no plain
+versus supervisory selector. Successful `RemoveItem` and `Unregister` also clear
+related advice state from the worker registry. Failed advice and cleanup calls
+leave registry state unchanged so diagnostics continue to reflect the last
+successful MXAccess-owned state transition.
+
 ## Handle Registry

 The worker should track MXAccess state for diagnostics and cleanup, while still
@@ -411,6 +510,13 @@ Rules:

 - Do not invent handles.
 - Do not rewrite handles returned by MXAccess.
+- Record server handles only after `Register` succeeds.
+- Remove server handles only after `Unregister` succeeds.
+- Record item handles only after `AddItem` or `AddItem2` succeeds.
+- Remove item handles only after `RemoveItem` succeeds.
+- Record advice state only after `Advise` or `AdviseSupervisory` succeeds.
+- Remove advice state only after `UnAdvise`, `RemoveItem`, or `Unregister`
+  succeeds.
 - Preserve invalid-handle behavior from MXAccess.
 - Preserve cross-server handle behavior from MXAccess.
 - Use registry state for cleanup and diagnostics, not semantic correction.
@@ -654,6 +760,10 @@ Live MXAccess tests:

 Live tests should be opt-in and clearly marked because they depend on installed
 MXAccess COM and provider state.
+The worker test suite uses `MXGATEWAY_RUN_LIVE_MXACCESS_TESTS=1` for these
+tests. `AddItem` uses `TestChildObject.TestInt` by default and accepts an
+override through `MXGATEWAY_LIVE_MXACCESS_ITEM`; `AddItem2` uses the captured
+parity fixture shape `AddItem2("TestInt", "TestChildObject")`.

 ## Initial Implementation Slice

@@ -107,6 +107,24 @@ worker, correlation, command, and client identity fields with redaction applied
 before values enter log state. `GatewayMetrics` exposes counters, gauges, and
 histograms through .NET `Meter` and a snapshot API that dashboard services can
 project without binding to a metrics exporter.
+`DashboardSnapshotService` projects sessions, workers, metrics, faults, and
+effective configuration into immutable DTOs for read-only dashboard rendering.
+The Blazor Server dashboard renders those snapshots at `/dashboard`,
+`/dashboard/sessions`, `/dashboard/workers`, `/dashboard/events`, and
+`/dashboard/settings`. Components subscribe to
+`IDashboardSnapshotService.WatchSnapshotsAsync()` and update on the configured
+snapshot interval without mutating session or worker state. The dashboard uses
+local Bootstrap CSS and JavaScript plus a small local stylesheet; it does not
+use a Blazor UI component library.
+
+Dashboard routes use the same API-key verifier as gRPC. `/dashboard/login`
+accepts the API key in a form body, validates the configured `admin` scope,
+and issues an HTTP-only secure cookie for subsequent dashboard requests.
+`/dashboard/logout` clears that cookie. Login and logout posts validate
+anti-forgery tokens, and API keys are never accepted through query strings.
+`Dashboard:AllowAnonymousLocalhost` can bypass the cookie requirement for
+loopback requests only when explicitly enabled. Setting
+`MxGateway:Dashboard:Enabled` to `false` leaves the dashboard routes unmapped.

 ### Worker Process

@@ -518,11 +536,7 @@ Worker policy:

 - bounded outbound event channel,
 - never block MXAccess event handler on pipe writes,
- if the outbound channel is full, apply configured policy:
-  - disconnect session,
-  - drop oldest low-priority data-change events,
-  - coalesce data changes by item handle,
-  - or block briefly then fault.
+- fail the worker session when the outbound channel is full.

 For full parity testing, default should be fail-fast rather than silent drop.
 For production high-rate telemetry, add explicit coalescing modes.
@@ -531,9 +545,15 @@ Gateway policy:

 - one event sequencer per session,
 - preserve per-session event order,
- support multiple client event subscribers only if explicitly required,
- apply backpressure from slow gRPC streams,
- disconnect or coalesce according to client-selected mode.
+- allow one active client event subscriber per session,
+- reject a second subscriber with a clear session error,
+- use a bounded `EventStreamService` queue between worker events and gRPC
+  writes,
+- fault the session when the bounded stream queue overflows,
+- detach the subscriber when the stream is canceled.
+
+The gateway forwards only events reported by the worker. It does not synthesize
+`OperationComplete` from write completion, command replies, or status frames.

 ## Isolation And Fault Handling

@@ -566,9 +586,13 @@ Because each client owns one worker, a crash or leak affects only that session.
 External gateway:

 - use TLS for remote gRPC if crossing machine boundaries,
- authenticate clients with Windows auth, mTLS, or a deployment-specific token,
- authorize access to commands that can write, authenticate users, or alter
-  runtime state.
+- authenticate v1 gRPC clients with `authorization: Bearer
+  mxgw_<key-id>_<secret>` API-key metadata,
+- reject missing or invalid API keys with gRPC `Unauthenticated`,
+- reject valid keys that lack the required session, invoke, event, metadata, or
+  admin scope with gRPC `PermissionDenied`,
+- authorize access to commands that can write, authenticate users, expose
+  metadata, stream events, or alter runtime state.

 Internal worker IPC:

@@ -795,6 +819,12 @@ Core operations:
 - track worker state,
 - close or kill worker.

+The gateway implementation keeps sessions in an in-memory `SessionRegistry`
+keyed by session id. `SessionManager` owns the state machine, creates
+per-session pipe names and nonces, starts the worker through the worker-client
+factory, gates commands to `Ready` sessions, exposes lease-close hooks, and
+cleans up workers during gateway shutdown.
+
 State machine:

 ```text
@@ -842,6 +872,15 @@ The gRPC layer should be thin:
 Avoid embedding MXAccess-specific business logic in gRPC handlers. Keep the
 translation code testable.

+The gateway maps `MxAccessGateway` to `MxAccessGatewayService`. The service
+implements `OpenSession`, `CloseSession`, `Invoke`, and `StreamEvents` by
+validating public requests, delegating session work to `ISessionManager`, and
+using explicit mapper code for public-to-worker commands and worker replies.
+`StreamEvents` delegates subscriber ownership, ordering, and backpressure to
+`EventStreamService`. Missing sessions and transport failures return gRPC
+status errors; worker command replies preserve MXAccess HRESULT and status
+details in the public reply.
+
 ## C# Worker Versus C++ Worker

 Start with a C# .NET Framework 4.8 x86 worker.
@@ -0,0 +1,95 @@
+[CmdletBinding()]
+param(
+    [switch]$Check
+)
+
+Set-StrictMode -Version Latest
+$ErrorActionPreference = "Stop"
+
+$repoRoot = Resolve-Path (Join-Path $PSScriptRoot "..")
+$protoRoot = Join-Path $repoRoot "src/MxGateway.Contracts/Protos"
+$manifestPath = Join-Path $repoRoot "clients/proto/proto-inputs.json"
+$descriptorPath = Join-Path $repoRoot "clients/proto/descriptors/mxaccessgw-client-v1.protoset"
+
+function Resolve-Protoc {
+    $pathCommand = Get-Command "protoc.exe" -ErrorAction SilentlyContinue
+    if ($null -ne $pathCommand) {
+        return $pathCommand.Source
+    }
+
+    $documentedPath = Join-Path $env:LOCALAPPDATA "Microsoft/WinGet/Packages/Google.Protobuf_Microsoft.Winget.Source_8wekyb3d8bbwe/bin/protoc.exe"
+    if (Test-Path $documentedPath) {
+        return $documentedPath
+    }
+
+    throw "Could not find protoc.exe. See docs/toolchain-links.md for the documented protobuf toolchain path."
+}
+
+function Ensure-Directory {
+    param([string]$Path)
+
+    if (-not (Test-Path $Path)) {
+        New-Item -ItemType Directory -Path $Path | Out-Null
+    }
+}
+
+function Compare-FileBytes {
+    param(
+        [string]$ExpectedPath,
+        [string]$ActualPath
+    )
+
+    if (-not (Test-Path $ExpectedPath)) {
+        return $false
+    }
+
+    $expected = [System.IO.File]::ReadAllBytes($ExpectedPath)
+    $actual = [System.IO.File]::ReadAllBytes($ActualPath)
+    if ($expected.Length -ne $actual.Length) {
+        return $false
+    }
+
+    for ($index = 0; $index -lt $expected.Length; $index++) {
+        if ($expected[$index] -ne $actual[$index]) {
+            return $false
+        }
+    }
+
+    return $true
+}
+
+$manifest = Get-Content -Raw $manifestPath | ConvertFrom-Json
+
+Ensure-Directory (Split-Path $descriptorPath -Parent)
+foreach ($output in $manifest.generatedOutputs.PSObject.Properties.Value) {
+    Ensure-Directory (Join-Path $repoRoot $output)
+}
+
+$protoc = Resolve-Protoc
+$outputPath = $descriptorPath
+if ($Check) {
+    $outputPath = Join-Path ([System.IO.Path]::GetTempPath()) ("mxaccessgw-client-v1-" + [System.Guid]::NewGuid().ToString("N") + ".protoset")
+}
+
+try {
+    & $protoc `
+        "--proto_path=$protoRoot" `
+        "--include_imports" `
+        "--include_source_info" `
+        "--descriptor_set_out=$outputPath" `
+        "mxaccess_gateway.proto" `
+        "mxaccess_worker.proto"
+
+    if ($LASTEXITCODE -ne 0) {
+        throw "protoc failed with exit code $LASTEXITCODE."
+    }
+
+    if ($Check -and -not (Compare-FileBytes -ExpectedPath $descriptorPath -ActualPath $outputPath)) {
+        throw "Client proto descriptor is stale. Run scripts/publish-client-proto-inputs.ps1 and commit the updated descriptor."
+    }
+}
+finally {
+    if ($Check -and (Test-Path $outputPath)) {
+        Remove-Item -LiteralPath $outputPath
+    }
+}
@@ -0,0 +1,26 @@
+[CmdletBinding()]
+param(
+    [switch]$NoBuild
+)
+
+Set-StrictMode -Version Latest
+$ErrorActionPreference = "Stop"
+
+$repoRoot = Resolve-Path (Join-Path $PSScriptRoot "..")
+$testProject = Join-Path $repoRoot "src/MxGateway.Tests/MxGateway.Tests.csproj"
+$arguments = @(
+    "test",
+    $testProject,
+    "--filter",
+    "ClientBehaviorFixtureTests"
+)
+
+if ($NoBuild) {
+    $arguments += "--no-build"
+}
+
+& dotnet @arguments
+
+if ($LASTEXITCODE -ne 0) {
+    throw "Client behavior fixture validation failed with exit code $LASTEXITCODE."
+}
@@ -6,6 +6,8 @@ namespace MxGateway.Contracts;
 /// </summary>
 public static class GatewayContractInfo
 {
+    public const uint GatewayProtocolVersion = 1;
+
    public const uint WorkerProtocolVersion = 1;

    public const string DefaultBackendName = "mxaccess-worker";
@@ -30,282 +30,282 @@ namespace MxGateway.Contracts.Proto {
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+            "dDABQhyqAhlNeEdhdGV3YXkuQ29udHJhY3RzLlByb3RvYgZwcm90bzM="));
      descriptor = pbr::FileDescriptor.FromGeneratedCode(descriptorData,
          new pbr::FileDescriptor[] { global::Google.Protobuf.WellKnownTypes.DurationReflection.Descriptor, global::Google.Protobuf.WellKnownTypes.TimestampReflection.Descriptor, },
          new pbr::GeneratedClrTypeInfo(new[] {typeof(global::MxGateway.Contracts.Proto.MxCommandKind), typeof(global::MxGateway.Contracts.Proto.MxEventFamily), typeof(global::MxGateway.Contracts.Proto.MxStatusCategory), typeof(global::MxGateway.Contracts.Proto.MxStatusSource), typeof(global::MxGateway.Contracts.Proto.MxDataType), typeof(global::MxGateway.Contracts.Proto.ProtocolStatusCode), typeof(global::MxGateway.Contracts.Proto.SessionState), }, null, new pbr::GeneratedClrTypeInfo[] {
            new pbr::GeneratedClrTypeInfo(typeof(global::MxGateway.Contracts.Proto.OpenSessionRequest), global::MxGateway.Contracts.Proto.OpenSessionRequest.Parser, new[]{ "RequestedBackend", "ClientSessionName", "ClientCorrelationId", "CommandTimeout" }, null, null, null, null),
-            new pbr::GeneratedClrTypeInfo(typeof(global::MxGateway.Contracts.Proto.OpenSessionReply), global::MxGateway.Contracts.Proto.OpenSessionReply.Parser, new[]{ "SessionId", "BackendName", "WorkerProcessId", "WorkerProtocolVersion", "Capabilities", "DefaultCommandTimeout", "ProtocolStatus" }, null, null, null, null),
+            new pbr::GeneratedClrTypeInfo(typeof(global::MxGateway.Contracts.Proto.OpenSessionReply), global::MxGateway.Contracts.Proto.OpenSessionReply.Parser, new[]{ "SessionId", "BackendName", "WorkerProcessId", "WorkerProtocolVersion", "Capabilities", "DefaultCommandTimeout", "ProtocolStatus", "GatewayProtocolVersion" }, null, null, null, null),
            new pbr::GeneratedClrTypeInfo(typeof(global::MxGateway.Contracts.Proto.CloseSessionRequest), global::MxGateway.Contracts.Proto.CloseSessionRequest.Parser, new[]{ "SessionId", "ClientCorrelationId" }, null, null, null, null),
            new pbr::GeneratedClrTypeInfo(typeof(global::MxGateway.Contracts.Proto.CloseSessionReply), global::MxGateway.Contracts.Proto.CloseSessionReply.Parser, new[]{ "SessionId", "FinalState", "ProtocolStatus" }, null, null, null, null),
            new pbr::GeneratedClrTypeInfo(typeof(global::MxGateway.Contracts.Proto.StreamEventsRequest), global::MxGateway.Contracts.Proto.StreamEventsRequest.Parser, new[]{ "SessionId", "AfterWorkerSequence" }, null, null, null, null),
@@ -841,6 +841,7 @@ namespace MxGateway.Contracts.Proto {
      capabilities_ = other.capabilities_.Clone();
      defaultCommandTimeout_ = other.defaultCommandTimeout_ != null ? other.defaultCommandTimeout_.Clone() : null;
      protocolStatus_ = other.protocolStatus_ != null ? other.protocolStatus_.Clone() : null;
+      gatewayProtocolVersion_ = other.gatewayProtocolVersion_;
      _unknownFields = pb::UnknownFieldSet.Clone(other._unknownFields);
    }

@@ -933,6 +934,23 @@ namespace MxGateway.Contracts.Proto {
      }
    }

+    /// <summary>Field number for the "gateway_protocol_version" field.</summary>
+    public const int GatewayProtocolVersionFieldNumber = 8;
+    private uint gatewayProtocolVersion_;
+    /// <summary>
+    /// Public gateway contract version implemented by this endpoint. Clients use
+    /// this value to reject incompatible generated-code inputs before issuing
+    /// command-specific MXAccess calls.
+    /// </summary>
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
+    [global::System.CodeDom.Compiler.GeneratedCode("protoc", null)]
+    public uint GatewayProtocolVersion {
+      get { return gatewayProtocolVersion_; }
+      set {
+        gatewayProtocolVersion_ = value;
+      }
+    }
+
    [global::System.Diagnostics.DebuggerNonUserCodeAttribute]
    [global::System.CodeDom.Compiler.GeneratedCode("protoc", null)]
    public override bool Equals(object other) {
@@ -955,6 +973,7 @@ namespace MxGateway.Contracts.Proto {
      if(!capabilities_.Equals(other.capabilities_)) return false;
      if (!object.Equals(DefaultCommandTimeout, other.DefaultCommandTimeout)) return false;
      if (!object.Equals(ProtocolStatus, other.ProtocolStatus)) return false;
+      if (GatewayProtocolVersion != other.GatewayProtocolVersion) return false;
      return Equals(_unknownFields, other._unknownFields);
    }

@@ -969,6 +988,7 @@ namespace MxGateway.Contracts.Proto {
      hash ^= capabilities_.GetHashCode();
      if (defaultCommandTimeout_ != null) hash ^= DefaultCommandTimeout.GetHashCode();
      if (protocolStatus_ != null) hash ^= ProtocolStatus.GetHashCode();
+      if (GatewayProtocolVersion != 0) hash ^= GatewayProtocolVersion.GetHashCode();
      if (_unknownFields != null) {
        hash ^= _unknownFields.GetHashCode();
      }
@@ -1012,6 +1032,10 @@ namespace MxGateway.Contracts.Proto {
        output.WriteRawTag(58);
        output.WriteMessage(ProtocolStatus);
      }
+      if (GatewayProtocolVersion != 0) {
+        output.WriteRawTag(64);
+        output.WriteUInt32(GatewayProtocolVersion);
+      }
      if (_unknownFields != null) {
        _unknownFields.WriteTo(output);
      }
@@ -1047,6 +1071,10 @@ namespace MxGateway.Contracts.Proto {
        output.WriteRawTag(58);
        output.WriteMessage(ProtocolStatus);
      }
+      if (GatewayProtocolVersion != 0) {
+        output.WriteRawTag(64);
+        output.WriteUInt32(GatewayProtocolVersion);
+      }
      if (_unknownFields != null) {
        _unknownFields.WriteTo(ref output);
      }
@@ -1076,6 +1104,9 @@ namespace MxGateway.Contracts.Proto {
      if (protocolStatus_ != null) {
        size += 1 + pb::CodedOutputStream.ComputeMessageSize(ProtocolStatus);
      }
+      if (GatewayProtocolVersion != 0) {
+        size += 1 + pb::CodedOutputStream.ComputeUInt32Size(GatewayProtocolVersion);
+      }
      if (_unknownFields != null) {
        size += _unknownFields.CalculateSize();
      }
@@ -1113,6 +1144,9 @@ namespace MxGateway.Contracts.Proto {
        }
        ProtocolStatus.MergeFrom(other.ProtocolStatus);
      }
+      if (other.GatewayProtocolVersion != 0) {
+        GatewayProtocolVersion = other.GatewayProtocolVersion;
+      }
      _unknownFields = pb::UnknownFieldSet.MergeFrom(_unknownFields, other._unknownFields);
    }

@@ -1166,6 +1200,10 @@ namespace MxGateway.Contracts.Proto {
            input.ReadMessage(ProtocolStatus);
            break;
          }
+          case 64: {
+            GatewayProtocolVersion = input.ReadUInt32();
+            break;
+          }
        }
      }
    #endif
@@ -1219,6 +1257,10 @@ namespace MxGateway.Contracts.Proto {
            input.ReadMessage(ProtocolStatus);
            break;
          }
+          case 64: {
+            GatewayProtocolVersion = input.ReadUInt32();
+            break;
+          }
        }
      }
    }
@@ -30,6 +30,10 @@ message OpenSessionReply {
  repeated string capabilities = 5;
  google.protobuf.Duration default_command_timeout = 6;
  ProtocolStatus protocol_status = 7;
+  // Public gateway contract version implemented by this endpoint. Clients use
+  // this value to reject incompatible generated-code inputs before issuing
+  // command-specific MXAccess calls.
+  uint32 gateway_protocol_version = 8;
 }

 message CloseSessionRequest {
@@ -0,0 +1,34 @@
+@inject IOptions<GatewayOptions> GatewayOptions
+
+<!doctype html>
+<html lang="en">
+<head>
+    <meta charset="utf-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1" />
+    <base href="@DashboardBaseHref" />
+    <link rel="stylesheet" href="/lib/bootstrap/css/bootstrap.min.css" />
+    <link rel="stylesheet" href="/css/dashboard.css" />
+    <HeadOutlet @rendermode="InteractiveServer" />
+</head>
+<body class="dashboard-body">
+    <Routes @rendermode="InteractiveServer" />
+    <script src="/lib/bootstrap/js/bootstrap.bundle.min.js"></script>
+    <script src="_framework/blazor.web.js"></script>
+</body>
+</html>
+
+@code {
+    private string DashboardBaseHref
+    {
+        get
+        {
+            string pathBase = GatewayOptions.Value.Dashboard.PathBase.TrimEnd('/');
+            if (string.IsNullOrWhiteSpace(pathBase))
+            {
+                pathBase = "/dashboard";
+            }
+
+            return $"{pathBase}/";
+        }
+    }
+}
@@ -0,0 +1,30 @@
+namespace MxGateway.Server.Dashboard.Components;
+
+public static class DashboardDisplay
+{
+    public static string DateTime(DateTimeOffset? value)
+    {
+        return value.HasValue
+            ? value.Value.UtcDateTime.ToString("yyyy-MM-dd HH:mm:ss 'UTC'", System.Globalization.CultureInfo.InvariantCulture)
+            : "-";
+    }
+
+    public static string Duration(TimeSpan value)
+    {
+        return value.TotalDays >= 1
+            ? value.ToString(@"d\.hh\:mm\:ss", System.Globalization.CultureInfo.InvariantCulture)
+            : value.ToString(@"hh\:mm\:ss", System.Globalization.CultureInfo.InvariantCulture);
+    }
+
+    public static string Text(string? value)
+    {
+        return string.IsNullOrWhiteSpace(value) ? "-" : value;
+    }
+
+    public static long MetricValue(DashboardSnapshot snapshot, string name, string? dimension = null)
+    {
+        return snapshot.Metrics.FirstOrDefault(metric =>
+            string.Equals(metric.Name, name, StringComparison.Ordinal)
+            && string.Equals(metric.Dimension, dimension, StringComparison.Ordinal))?.Value ?? 0;
+    }
+}
@@ -0,0 +1,48 @@
+using Microsoft.AspNetCore.Components;
+
+namespace MxGateway.Server.Dashboard.Components;
+
+public abstract class DashboardPageBase : ComponentBase, IAsyncDisposable
+{
+    private readonly CancellationTokenSource _disposeCancellation = new();
+    private Task? _watchTask;
+
+    [Inject]
+    protected IDashboardSnapshotService SnapshotService { get; set; } = null!;
+
+    protected DashboardSnapshot? Snapshot { get; private set; }
+
+    protected override void OnInitialized()
+    {
+        _watchTask = WatchSnapshotsAsync();
+    }
+
+    public async ValueTask DisposeAsync()
+    {
+        await _disposeCancellation.CancelAsync().ConfigureAwait(false);
+        if (_watchTask is not null)
+        {
+            await _watchTask.ConfigureAwait(false);
+        }
+
+        _disposeCancellation.Dispose();
+        GC.SuppressFinalize(this);
+    }
+
+    private async Task WatchSnapshotsAsync()
+    {
+        try
+        {
+            await foreach (DashboardSnapshot snapshot in SnapshotService
+                .WatchSnapshotsAsync(_disposeCancellation.Token)
+                .ConfigureAwait(false))
+            {
+                Snapshot = snapshot;
+                await InvokeAsync(StateHasChanged).ConfigureAwait(false);
+            }
+        }
+        catch (OperationCanceledException) when (_disposeCancellation.IsCancellationRequested)
+        {
+        }
+    }
+}
@@ -0,0 +1,53 @@
+@inherits LayoutComponentBase
+@inject IOptions<GatewayOptions> GatewayOptions
+
+<div class="dashboard-shell">
+    <nav class="navbar navbar-expand-lg bg-body border-bottom dashboard-navbar">
+        <div class="container-fluid">
+            <a class="navbar-brand" href="">MXAccess Gateway</a>
+            <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#dashboardNav"
+                    aria-controls="dashboardNav" aria-expanded="false" aria-label="Toggle navigation">
+                <span class="navbar-toggler-icon"></span>
+            </button>
+            <div class="collapse navbar-collapse" id="dashboardNav">
+                <ul class="navbar-nav me-auto mb-2 mb-lg-0">
+                    <li class="nav-item">
+                        <NavLink class="nav-link" href="" Match="NavLinkMatch.All">Overview</NavLink>
+                    </li>
+                    <li class="nav-item">
+                        <NavLink class="nav-link" href="sessions">Sessions</NavLink>
+                    </li>
+                    <li class="nav-item">
+                        <NavLink class="nav-link" href="workers">Workers</NavLink>
+                    </li>
+                    <li class="nav-item">
+                        <NavLink class="nav-link" href="events">Events</NavLink>
+                    </li>
+                    <li class="nav-item">
+                        <NavLink class="nav-link" href="settings">Settings</NavLink>
+                    </li>
+                </ul>
+                <form method="post" action="@DashboardPath("/logout")" class="d-flex">
+                    <AntiforgeryToken />
+                    <button class="btn btn-outline-secondary btn-sm" type="submit">Sign out</button>
+                </form>
+            </div>
+        </div>
+    </nav>
+    <main class="container-fluid dashboard-content">
+        @Body
+    </main>
+</div>
+
+@code {
+    private string DashboardPath(string relativePath)
+    {
+        string pathBase = GatewayOptions.Value.Dashboard.PathBase.TrimEnd('/');
+        if (string.IsNullOrWhiteSpace(pathBase))
+        {
+            pathBase = "/dashboard";
+        }
+
+        return $"{pathBase}{relativePath}";
+    }
+}
@@ -0,0 +1,37 @@
+@page "/"
+@inherits DashboardPageBase
+
+<PageTitle>MXAccess Gateway Dashboard</PageTitle>
+
+@if (Snapshot is null)
+{
+    <div class="empty-state">Loading dashboard snapshot.</div>
+}
+else
+{
+    <div class="dashboard-page-header">
+        <div>
+            <h1>Overview</h1>
+            <div class="text-secondary">Generated @DashboardDisplay.DateTime(Snapshot.GeneratedAt)</div>
+        </div>
+        <StatusBadge Text="@Snapshot.GatewayStatus" />
+    </div>
+
+    <section class="metric-grid">
+        <MetricCard Label="Uptime" Value="@DashboardDisplay.Duration(Snapshot.GatewayUptime)" Detail="@Snapshot.GatewayVersion" />
+        <MetricCard Label="Open Sessions" Value="@DashboardDisplay.MetricValue(Snapshot, "mxgateway.sessions.open").ToString(System.Globalization.CultureInfo.InvariantCulture)" />
+        <MetricCard Label="Workers Running" Value="@DashboardDisplay.MetricValue(Snapshot, "mxgateway.workers.running").ToString(System.Globalization.CultureInfo.InvariantCulture)" />
+        <MetricCard Label="Event Queue Depth" Value="@DashboardDisplay.MetricValue(Snapshot, "mxgateway.events.queue.depth").ToString(System.Globalization.CultureInfo.InvariantCulture)" />
+        <MetricCard Label="Commands Failed" Value="@DashboardDisplay.MetricValue(Snapshot, "mxgateway.commands.failed").ToString(System.Globalization.CultureInfo.InvariantCulture)" />
+        <MetricCard Label="Events Received" Value="@DashboardDisplay.MetricValue(Snapshot, "mxgateway.events.received").ToString(System.Globalization.CultureInfo.InvariantCulture)" />
+        <MetricCard Label="Faults" Value="@DashboardDisplay.MetricValue(Snapshot, "mxgateway.faults").ToString(System.Globalization.CultureInfo.InvariantCulture)" />
+        <MetricCard Label="Queue Overflows" Value="@DashboardDisplay.MetricValue(Snapshot, "mxgateway.queues.overflows").ToString(System.Globalization.CultureInfo.InvariantCulture)" />
+    </section>
+
+    <section class="dashboard-section">
+        <div class="section-heading">
+            <h2>Recent Faults</h2>
+        </div>
+        <FaultList Faults="@Snapshot.Faults" />
+    </section>
+}
@@ -0,0 +1,64 @@
+@page "/events"
+@inherits DashboardPageBase
+
+<PageTitle>Dashboard Events</PageTitle>
+
+@if (Snapshot is null)
+{
+    <div class="empty-state">Loading event diagnostics.</div>
+}
+else
+{
+    <div class="dashboard-page-header">
+        <div>
+            <h1>Events</h1>
+            <div class="text-secondary">Generated @DashboardDisplay.DateTime(Snapshot.GeneratedAt)</div>
+        </div>
+    </div>
+
+    <section class="metric-grid compact">
+        <MetricCard Label="Events Received" Value="@DashboardDisplay.MetricValue(Snapshot, "mxgateway.events.received").ToString(System.Globalization.CultureInfo.InvariantCulture)" />
+        <MetricCard Label="Event Queue Depth" Value="@DashboardDisplay.MetricValue(Snapshot, "mxgateway.events.queue.depth").ToString(System.Globalization.CultureInfo.InvariantCulture)" />
+        <MetricCard Label="Queue Overflows" Value="@DashboardDisplay.MetricValue(Snapshot, "mxgateway.queues.overflows").ToString(System.Globalization.CultureInfo.InvariantCulture)" />
+        <MetricCard Label="Stream Disconnects" Value="@DashboardDisplay.MetricValue(Snapshot, "mxgateway.grpc.streams.disconnected").ToString(System.Globalization.CultureInfo.InvariantCulture)" />
+    </section>
+
+    <section class="dashboard-section">
+        <div class="section-heading">
+            <h2>Event Families</h2>
+        </div>
+        @if (EventFamilyMetrics.Count == 0)
+        {
+            <div class="empty-state">No event family counters recorded.</div>
+        }
+        else
+        {
+            <div class="table-responsive">
+                <table class="table table-sm dashboard-table">
+                    <thead>
+                        <tr>
+                            <th scope="col">Family</th>
+                            <th scope="col">Count</th>
+                        </tr>
+                    </thead>
+                    <tbody>
+                        @foreach (DashboardMetricSummary metric in EventFamilyMetrics)
+                        {
+                            <tr>
+                                <td>@metric.Dimension</td>
+                                <td>@metric.Value</td>
+                            </tr>
+                        }
+                    </tbody>
+                </table>
+            </div>
+        }
+    </section>
+}
+
+@code {
+    private IReadOnlyList<DashboardMetricSummary> EventFamilyMetrics => Snapshot?.Metrics
+        .Where(metric => metric.Name == "mxgateway.events.received" && metric.Dimension is not null)
+        .OrderBy(metric => metric.Dimension, StringComparer.OrdinalIgnoreCase)
+        .ToArray() ?? [];
+}
@@ -0,0 +1,69 @@
+@page "/sessions/{SessionId}"
+@inherits DashboardPageBase
+
+<PageTitle>Dashboard Session</PageTitle>
+
+@if (Snapshot is null)
+{
+    <div class="empty-state">Loading session.</div>
+}
+else if (CurrentSession is null)
+{
+    <section class="dashboard-section">
+        <h1 class="h4 mb-3">Session Not Found</h1>
+        <p class="mb-0">The session is not present in the current snapshot.</p>
+    </section>
+}
+else
+{
+    <div class="dashboard-page-header">
+        <div>
+            <h1>Session Details</h1>
+            <div class="text-secondary"><code>@CurrentSession.SessionId</code></div>
+        </div>
+        <StatusBadge Text="@CurrentSession.State.ToString()" />
+    </div>
+
+    <section class="dashboard-section">
+        <div class="section-heading">
+            <h2>Session</h2>
+        </div>
+        <div class="table-responsive">
+            <table class="table table-sm dashboard-table details-table">
+                <tbody>
+                    <tr><th scope="row">Backend</th><td>@CurrentSession.BackendName</td></tr>
+                    <tr><th scope="row">Client identity</th><td>@DashboardDisplay.Text(CurrentSession.ClientIdentity)</td></tr>
+                    <tr><th scope="row">Client session</th><td>@DashboardDisplay.Text(CurrentSession.ClientSessionName)</td></tr>
+                    <tr><th scope="row">Client correlation</th><td>@DashboardDisplay.Text(CurrentSession.ClientCorrelationId)</td></tr>
+                    <tr><th scope="row">Opened</th><td>@DashboardDisplay.DateTime(CurrentSession.OpenedAt)</td></tr>
+                    <tr><th scope="row">Last activity</th><td>@DashboardDisplay.DateTime(CurrentSession.LastClientActivityAt)</td></tr>
+                    <tr><th scope="row">Lease expires</th><td>@DashboardDisplay.DateTime(CurrentSession.LeaseExpiresAt)</td></tr>
+                    <tr><th scope="row">Last fault</th><td>@DashboardDisplay.Text(CurrentSession.LastFault)</td></tr>
+                </tbody>
+            </table>
+        </div>
+    </section>
+
+    <section class="dashboard-section">
+        <div class="section-heading">
+            <h2>Worker</h2>
+        </div>
+        <div class="table-responsive">
+            <table class="table table-sm dashboard-table details-table">
+                <tbody>
+                    <tr><th scope="row">Process id</th><td>@(CurrentSession.WorkerProcessId?.ToString(System.Globalization.CultureInfo.InvariantCulture) ?? "-")</td></tr>
+                    <tr><th scope="row">State</th><td><StatusBadge Text="@(CurrentSession.WorkerState?.ToString() ?? "-")" /></td></tr>
+                    <tr><th scope="row">Last heartbeat</th><td>@DashboardDisplay.DateTime(CurrentSession.LastWorkerHeartbeatAt)</td></tr>
+                </tbody>
+            </table>
+        </div>
+    </section>
+}
+
+@code {
+    [Parameter]
+    public string SessionId { get; set; } = string.Empty;
+
+    private DashboardSessionSummary? CurrentSession => Snapshot?.Sessions.FirstOrDefault(session =>
+        string.Equals(session.SessionId, SessionId, StringComparison.Ordinal));
+}
@@ -0,0 +1,67 @@
+@page "/sessions"
+@inherits DashboardPageBase
+
+<PageTitle>Dashboard Sessions</PageTitle>
+
+@if (Snapshot is null)
+{
+    <div class="empty-state">Loading sessions.</div>
+}
+else
+{
+    <div class="dashboard-page-header">
+        <div>
+            <h1>Sessions</h1>
+            <div class="text-secondary">@Snapshot.Sessions.Count session rows</div>
+        </div>
+    </div>
+
+    <section class="dashboard-section">
+        @if (Snapshot.Sessions.Count == 0)
+        {
+            <div class="empty-state">No sessions are active or retained.</div>
+        }
+        else
+        {
+            <div class="table-responsive">
+                <table class="table table-sm align-middle dashboard-table">
+                    <thead>
+                        <tr>
+                            <th scope="col">Session</th>
+                            <th scope="col">State</th>
+                            <th scope="col">Client</th>
+                            <th scope="col">Backend</th>
+                            <th scope="col">Worker</th>
+                            <th scope="col">Opened</th>
+                            <th scope="col">Activity</th>
+                            <th scope="col">Heartbeat</th>
+                            <th scope="col">Fault</th>
+                        </tr>
+                    </thead>
+                    <tbody>
+                        @foreach (DashboardSessionSummary session in Snapshot.Sessions)
+                        {
+                            <tr>
+                                <td><NavLink href="@($"sessions/{Uri.EscapeDataString(session.SessionId)}")"><code>@session.SessionId</code></NavLink></td>
+                                <td><StatusBadge Text="@session.State.ToString()" /></td>
+                                <td>@DashboardDisplay.Text(session.ClientIdentity)</td>
+                                <td>@session.BackendName</td>
+                                <td>
+                                    @(session.WorkerProcessId?.ToString(System.Globalization.CultureInfo.InvariantCulture) ?? "-")
+                                    @if (session.WorkerState is not null)
+                                    {
+                                        <span class="ms-1"><StatusBadge Text="@session.WorkerState.ToString()" /></span>
+                                    }
+                                </td>
+                                <td>@DashboardDisplay.DateTime(session.OpenedAt)</td>
+                                <td>@DashboardDisplay.DateTime(session.LastClientActivityAt)</td>
+                                <td>@DashboardDisplay.DateTime(session.LastWorkerHeartbeatAt)</td>
+                                <td>@DashboardDisplay.Text(session.LastFault)</td>
+                            </tr>
+                        }
+                    </tbody>
+                </table>
+            </div>
+        }
+    </section>
+}
@@ -0,0 +1,47 @@
+@page "/settings"
+@inherits DashboardPageBase
+
+<PageTitle>Dashboard Settings</PageTitle>
+
+@if (Snapshot is null)
+{
+    <div class="empty-state">Loading settings.</div>
+}
+else
+{
+    <div class="dashboard-page-header">
+        <div>
+            <h1>Settings</h1>
+            <div class="text-secondary">Effective gateway configuration</div>
+        </div>
+    </div>
+
+    <section class="dashboard-section">
+        <div class="table-responsive">
+            <table class="table table-sm dashboard-table details-table">
+                <tbody>
+                    <tr><th scope="row">Authentication mode</th><td>@Snapshot.Configuration.Authentication.Mode</td></tr>
+                    <tr><th scope="row">Auth database</th><td><code>@Snapshot.Configuration.Authentication.SqlitePath</code></td></tr>
+                    <tr><th scope="row">Pepper secret</th><td>@Snapshot.Configuration.Authentication.PepperSecretName</td></tr>
+                    <tr><th scope="row">Run migrations</th><td>@Snapshot.Configuration.Authentication.RunMigrationsOnStartup</td></tr>
+                    <tr><th scope="row">Worker executable</th><td><code>@Snapshot.Configuration.Worker.ExecutablePath</code></td></tr>
+                    <tr><th scope="row">Worker architecture</th><td>@Snapshot.Configuration.Worker.RequiredArchitecture</td></tr>
+                    <tr><th scope="row">Startup timeout</th><td>@Snapshot.Configuration.Worker.StartupTimeoutSeconds seconds</td></tr>
+                    <tr><th scope="row">Shutdown timeout</th><td>@Snapshot.Configuration.Worker.ShutdownTimeoutSeconds seconds</td></tr>
+                    <tr><th scope="row">Heartbeat grace</th><td>@Snapshot.Configuration.Worker.HeartbeatGraceSeconds seconds</td></tr>
+                    <tr><th scope="row">Default command timeout</th><td>@Snapshot.Configuration.Sessions.DefaultCommandTimeoutSeconds seconds</td></tr>
+                    <tr><th scope="row">Max sessions</th><td>@Snapshot.Configuration.Sessions.MaxSessions</td></tr>
+                    <tr><th scope="row">Event queue capacity</th><td>@Snapshot.Configuration.Events.QueueCapacity</td></tr>
+                    <tr><th scope="row">Backpressure policy</th><td>@Snapshot.Configuration.Events.BackpressurePolicy</td></tr>
+                    <tr><th scope="row">Dashboard enabled</th><td>@Snapshot.Configuration.Dashboard.Enabled</td></tr>
+                    <tr><th scope="row">Dashboard path</th><td>@Snapshot.Configuration.Dashboard.PathBase</td></tr>
+                    <tr><th scope="row">Require admin scope</th><td>@Snapshot.Configuration.Dashboard.RequireAdminScope</td></tr>
+                    <tr><th scope="row">Anonymous localhost</th><td>@Snapshot.Configuration.Dashboard.AllowAnonymousLocalhost</td></tr>
+                    <tr><th scope="row">Snapshot interval</th><td>@Snapshot.Configuration.Dashboard.SnapshotIntervalMilliseconds ms</td></tr>
+                    <tr><th scope="row">Show tag values</th><td>@Snapshot.Configuration.Dashboard.ShowTagValues</td></tr>
+                    <tr><th scope="row">Worker protocol</th><td>@Snapshot.Configuration.Protocol.WorkerProtocolVersion</td></tr>
+                </tbody>
+            </table>
+        </div>
+    </section>
+}
@@ -0,0 +1,53 @@
+@page "/workers"
+@inherits DashboardPageBase
+
+<PageTitle>Dashboard Workers</PageTitle>
+
+@if (Snapshot is null)
+{
+    <div class="empty-state">Loading workers.</div>
+}
+else
+{
+    <div class="dashboard-page-header">
+        <div>
+            <h1>Workers</h1>
+            <div class="text-secondary">@Snapshot.Workers.Count worker rows</div>
+        </div>
+    </div>
+
+    <section class="dashboard-section">
+        @if (Snapshot.Workers.Count == 0)
+        {
+            <div class="empty-state">No worker processes are attached.</div>
+        }
+        else
+        {
+            <div class="table-responsive">
+                <table class="table table-sm align-middle dashboard-table">
+                    <thead>
+                        <tr>
+                            <th scope="col">Process</th>
+                            <th scope="col">State</th>
+                            <th scope="col">Session</th>
+                            <th scope="col">Heartbeat</th>
+                            <th scope="col">Fault</th>
+                        </tr>
+                    </thead>
+                    <tbody>
+                        @foreach (DashboardWorkerSummary worker in Snapshot.Workers)
+                        {
+                            <tr>
+                                <td>@(worker.ProcessId?.ToString(System.Globalization.CultureInfo.InvariantCulture) ?? "-")</td>
+                                <td><StatusBadge Text="@worker.State.ToString()" /></td>
+                                <td><NavLink href="@($"sessions/{Uri.EscapeDataString(worker.SessionId)}")"><code>@worker.SessionId</code></NavLink></td>
+                                <td>@DashboardDisplay.DateTime(worker.LastHeartbeatAt)</td>
+                                <td>@DashboardDisplay.Text(worker.LastFault)</td>
+                            </tr>
+                        }
+                    </tbody>
+                </table>
+            </div>
+        }
+    </section>
+}
@@ -0,0 +1,15 @@
+<Router AppAssembly="@typeof(Routes).Assembly">
+    <Found Context="routeData">
+        <RouteView RouteData="@routeData" DefaultLayout="@typeof(DashboardLayout)" />
+        <FocusOnNavigate RouteData="@routeData" Selector="h1" />
+    </Found>
+    <NotFound>
+        <LayoutView Layout="@typeof(DashboardLayout)">
+            <PageTitle>Dashboard - Not Found</PageTitle>
+            <section class="dashboard-section">
+                <h1 class="h4 mb-3">Not Found</h1>
+                <p class="mb-0">The requested dashboard page does not exist.</p>
+            </section>
+        </LayoutView>
+    </NotFound>
+</Router>
@@ -0,0 +1,39 @@
+@if (Faults.Count == 0)
+{
+    <div class="empty-state">No faults recorded.</div>
+}
+else
+{
+    <div class="table-responsive">
+        <table class="table table-sm align-middle dashboard-table">
+            <thead>
+                <tr>
+                    <th scope="col">Observed</th>
+                    <th scope="col">Source</th>
+                    <th scope="col">Session</th>
+                    <th scope="col">Worker</th>
+                    <th scope="col">State</th>
+                    <th scope="col">Message</th>
+                </tr>
+            </thead>
+            <tbody>
+                @foreach (DashboardFaultSummary fault in Faults)
+                {
+                    <tr>
+                        <td>@DashboardDisplay.DateTime(fault.ObservedAt)</td>
+                        <td>@fault.Source</td>
+                        <td><code>@DashboardDisplay.Text(fault.SessionId)</code></td>
+                        <td>@(fault.WorkerProcessId?.ToString(System.Globalization.CultureInfo.InvariantCulture) ?? "-")</td>
+                        <td><StatusBadge Text="@fault.State" /></td>
+                        <td>@fault.Message</td>
+                    </tr>
+                }
+            </tbody>
+        </table>
+    </div>
+}
+
+@code {
+    [Parameter]
+    public IReadOnlyList<DashboardFaultSummary> Faults { get; set; } = [];
+}
@@ -0,0 +1,21 @@
+<div class="card metric-card h-100">
+    <div class="card-body">
+        <div class="metric-label">@Label</div>
+        <div class="metric-value">@Value</div>
+        @if (!string.IsNullOrWhiteSpace(Detail))
+        {
+            <div class="metric-detail">@Detail</div>
+        }
+    </div>
+</div>
+
+@code {
+    [Parameter]
+    public string Label { get; set; } = string.Empty;
+
+    [Parameter]
+    public string Value { get; set; } = string.Empty;
+
+    [Parameter]
+    public string? Detail { get; set; }
+}
@@ -0,0 +1,15 @@
+<span class="badge @CssClass">@Text</span>
+
+@code {
+    [Parameter]
+    public string? Text { get; set; }
+
+    private string CssClass => Text switch
+    {
+        "Ready" or "Healthy" => "text-bg-success",
+        "Creating" or "StartingWorker" or "WaitingForPipe" or "InitializingWorker" or "Closing" => "text-bg-info",
+        "Closed" => "text-bg-secondary",
+        "Faulted" => "text-bg-danger",
+        _ => "text-bg-light text-dark border"
+    };
+}
@@ -0,0 +1,12 @@
+@using Microsoft.AspNetCore.Components.Authorization
+@using Microsoft.AspNetCore.Components.Forms
+@using Microsoft.AspNetCore.Components.Routing
+@using Microsoft.AspNetCore.Components.Web
+@using Microsoft.Extensions.Options
+@using MxGateway.Contracts.Proto
+@using MxGateway.Server.Configuration
+@using MxGateway.Server.Dashboard
+@using MxGateway.Server.Dashboard.Components.Layout
+@using MxGateway.Server.Dashboard.Components.Shared
+@using MxGateway.Server.Workers
+@using static Microsoft.AspNetCore.Components.Web.RenderMode
@@ -0,0 +1,10 @@
+namespace MxGateway.Server.Dashboard;
+
+public static class DashboardAuthenticationDefaults
+{
+    public const string AuthenticationScheme = "MxGateway.Dashboard";
+    public const string AuthorizationPolicy = "MxGateway.Dashboard";
+    public const string ScopeClaimType = "scope";
+    public const string KeyPrefixClaimType = "mxgateway:key_prefix";
+    public const string CookieName = "__Host-MxGatewayDashboard";
+}
@@ -0,0 +1,19 @@
+using System.Security.Claims;
+
+namespace MxGateway.Server.Dashboard;
+
+public sealed record DashboardAuthenticationResult(
+    bool Succeeded,
+    ClaimsPrincipal? Principal,
+    string? FailureMessage)
+{
+    public static DashboardAuthenticationResult Success(ClaimsPrincipal principal)
+    {
+        return new DashboardAuthenticationResult(true, principal, null);
+    }
+
+    public static DashboardAuthenticationResult Fail(string failureMessage)
+    {
+        return new DashboardAuthenticationResult(false, null, failureMessage);
+    }
+}
@@ -0,0 +1,81 @@
+using System.Security.Claims;
+using Microsoft.Extensions.Options;
+using MxGateway.Server.Configuration;
+using MxGateway.Server.Security.Authentication;
+using MxGateway.Server.Security.Authorization;
+
+namespace MxGateway.Server.Dashboard;
+
+public sealed class DashboardAuthenticator(
+    IApiKeyVerifier apiKeyVerifier,
+    IOptions<GatewayOptions> options) : IDashboardAuthenticator
+{
+    private const string GenericFailureMessage = "The API key is invalid or is not authorized for dashboard access.";
+
+    public async Task<DashboardAuthenticationResult> AuthenticateAsync(
+        string? apiKey,
+        CancellationToken cancellationToken)
+    {
+        if (options.Value.Authentication.Mode == AuthenticationMode.Disabled)
+        {
+            return DashboardAuthenticationResult.Success(CreatePrincipal(new ApiKeyIdentity(
+                KeyId: "authentication-disabled",
+                KeyPrefix: "authentication-disabled",
+                DisplayName: "Authentication Disabled",
+                Scopes: new HashSet<string>([GatewayScopes.Admin], StringComparer.Ordinal))));
+        }
+
+        if (string.IsNullOrWhiteSpace(apiKey))
+        {
+            return DashboardAuthenticationResult.Fail(GenericFailureMessage);
+        }
+
+        ApiKeyVerificationResult verificationResult = await apiKeyVerifier
+            .VerifyAsync(FormatAuthorizationHeader(apiKey), cancellationToken)
+            .ConfigureAwait(false);
+
+        if (!verificationResult.Succeeded || verificationResult.Identity is null)
+        {
+            return DashboardAuthenticationResult.Fail(GenericFailureMessage);
+        }
+
+        if (options.Value.Dashboard.RequireAdminScope
+            && !verificationResult.Identity.Scopes.Contains(GatewayScopes.Admin))
+        {
+            return DashboardAuthenticationResult.Fail(GenericFailureMessage);
+        }
+
+        return DashboardAuthenticationResult.Success(CreatePrincipal(verificationResult.Identity));
+    }
+
+    private static string FormatAuthorizationHeader(string apiKey)
+    {
+        string trimmedApiKey = apiKey.Trim();
+
+        return trimmedApiKey.StartsWith("Bearer ", StringComparison.OrdinalIgnoreCase)
+            ? trimmedApiKey
+            : $"Bearer {trimmedApiKey}";
+    }
+
+    private static ClaimsPrincipal CreatePrincipal(ApiKeyIdentity identity)
+    {
+        List<Claim> claims =
+        [
+            new Claim(ClaimTypes.NameIdentifier, identity.KeyId),
+            new Claim(ClaimTypes.Name, identity.DisplayName),
+            new Claim(DashboardAuthenticationDefaults.KeyPrefixClaimType, identity.KeyPrefix)
+        ];
+
+        claims.AddRange(identity.Scopes.Select(scope => new Claim(
+            DashboardAuthenticationDefaults.ScopeClaimType,
+            scope)));
+
+        ClaimsIdentity claimsIdentity = new(
+            claims,
+            DashboardAuthenticationDefaults.AuthenticationScheme,
+            ClaimTypes.Name,
+            DashboardAuthenticationDefaults.ScopeClaimType);
+
+        return new ClaimsPrincipal(claimsIdentity);
+    }
+}
@@ -0,0 +1,59 @@
+using System.Net;
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.Extensions.Options;
+using MxGateway.Server.Configuration;
+using MxGateway.Server.Security.Authorization;
+
+namespace MxGateway.Server.Dashboard;
+
+public sealed class DashboardAuthorizationHandler(
+    IHttpContextAccessor httpContextAccessor,
+    IOptions<GatewayOptions> options) : AuthorizationHandler<DashboardAuthorizationRequirement>
+{
+    protected override Task HandleRequirementAsync(
+        AuthorizationHandlerContext context,
+        DashboardAuthorizationRequirement requirement)
+    {
+        GatewayOptions gatewayOptions = options.Value;
+
+        if (gatewayOptions.Authentication.Mode == AuthenticationMode.Disabled)
+        {
+            context.Succeed(requirement);
+
+            return Task.CompletedTask;
+        }
+
+        if (gatewayOptions.Dashboard.AllowAnonymousLocalhost && IsLoopbackRequest())
+        {
+            context.Succeed(requirement);
+
+            return Task.CompletedTask;
+        }
+
+        if (context.User.Identity?.IsAuthenticated != true)
+        {
+            return Task.CompletedTask;
+        }
+
+        if (!gatewayOptions.Dashboard.RequireAdminScope || HasAdminScope(context))
+        {
+            context.Succeed(requirement);
+        }
+
+        return Task.CompletedTask;
+    }
+
+    private bool IsLoopbackRequest()
+    {
+        IPAddress? remoteAddress = httpContextAccessor.HttpContext?.Connection.RemoteIpAddress;
+
+        return remoteAddress is not null && IPAddress.IsLoopback(remoteAddress);
+    }
+
+    private static bool HasAdminScope(AuthorizationHandlerContext context)
+    {
+        return context.User.HasClaim(
+            DashboardAuthenticationDefaults.ScopeClaimType,
+            GatewayScopes.Admin);
+    }
+}
@@ -0,0 +1,5 @@
+using Microsoft.AspNetCore.Authorization;
+
+namespace MxGateway.Server.Dashboard;
+
+public sealed class DashboardAuthorizationRequirement : IAuthorizationRequirement;
@@ -0,0 +1,197 @@
+using System.Text.Encodings.Web;
+using Microsoft.AspNetCore.Antiforgery;
+using Microsoft.AspNetCore.Authentication;
+using Microsoft.AspNetCore.Http.HttpResults;
+using MxGateway.Server.Configuration;
+using MxGateway.Server.Dashboard.Components;
+
+namespace MxGateway.Server.Dashboard;
+
+public static class DashboardEndpointRouteBuilderExtensions
+{
+    public static IEndpointRouteBuilder MapGatewayDashboard(this IEndpointRouteBuilder endpoints)
+    {
+        IConfiguration configuration = endpoints.ServiceProvider.GetRequiredService<IConfiguration>();
+        IConfigurationSection dashboardSection = configuration
+            .GetSection($"{GatewayOptions.SectionName}:Dashboard");
+
+        if (bool.TryParse(dashboardSection["Enabled"], out bool enabled) && !enabled)
+        {
+            return endpoints;
+        }
+
+        string pathBase = NormalizePathBase(dashboardSection["PathBase"] ?? new DashboardOptions().PathBase);
+        RouteGroupBuilder dashboard = endpoints.MapGroup(pathBase);
+
+        dashboard.MapGet(
+                "/login",
+                (HttpContext httpContext, IAntiforgery antiforgery) => GetLoginAsync(httpContext, antiforgery, pathBase))
+            .AllowAnonymous()
+            .WithName("DashboardLogin");
+
+        dashboard.MapPost(
+                "/login",
+                (HttpContext httpContext, IAntiforgery antiforgery, IDashboardAuthenticator authenticator) =>
+                    PostLoginAsync(httpContext, antiforgery, authenticator, pathBase))
+            .AllowAnonymous()
+            .WithName("DashboardLoginPost");
+
+        dashboard.MapPost(
+                "/logout",
+                (HttpContext httpContext, IAntiforgery antiforgery) => PostLogoutAsync(httpContext, antiforgery, pathBase))
+            .RequireAuthorization(DashboardAuthenticationDefaults.AuthorizationPolicy)
+            .WithName("DashboardLogout");
+
+        dashboard.MapGet("/denied", () => Results.Content(
+                RenderPage("Access denied", "<p>The signed-in API key is not authorized for dashboard access.</p>"),
+                "text/html"))
+            .AllowAnonymous()
+            .WithName("DashboardAccessDenied");
+
+        dashboard.MapRazorComponents<App>()
+            .AddInteractiveServerRenderMode()
+            .RequireAuthorization(DashboardAuthenticationDefaults.AuthorizationPolicy);
+
+        return endpoints;
+    }
+
+    private static Task<ContentHttpResult> GetLoginAsync(
+        HttpContext httpContext,
+        IAntiforgery antiforgery,
+        string pathBase)
+    {
+        string returnUrl = SanitizeReturnUrl(
+            httpContext.Request.Query["returnUrl"].ToString(),
+            pathBase);
+
+        return Task.FromResult(TypedResults.Content(
+            RenderLoginPage(httpContext, antiforgery, returnUrl, pathBase, failureMessage: null),
+            "text/html"));
+    }
+
+    private static async Task<IResult> PostLoginAsync(
+        HttpContext httpContext,
+        IAntiforgery antiforgery,
+        IDashboardAuthenticator authenticator,
+        string pathBase)
+    {
+        await antiforgery.ValidateRequestAsync(httpContext).ConfigureAwait(false);
+
+        IFormCollection form = await httpContext.Request
+            .ReadFormAsync(httpContext.RequestAborted)
+            .ConfigureAwait(false);
+        string returnUrl = SanitizeReturnUrl(
+            form["returnUrl"].ToString(),
+            pathBase);
+
+        DashboardAuthenticationResult result = await authenticator
+            .AuthenticateAsync(form["apiKey"].ToString(), httpContext.RequestAborted)
+            .ConfigureAwait(false);
+
+        if (!result.Succeeded || result.Principal is null)
+        {
+            return TypedResults.Content(
+                RenderLoginPage(httpContext, antiforgery, returnUrl, pathBase, result.FailureMessage),
+                "text/html",
+                statusCode: StatusCodes.Status401Unauthorized);
+        }
+
+        await httpContext
+            .SignInAsync(DashboardAuthenticationDefaults.AuthenticationScheme, result.Principal)
+            .ConfigureAwait(false);
+
+        return Results.LocalRedirect(returnUrl);
+    }
+
+    private static async Task<IResult> PostLogoutAsync(
+        HttpContext httpContext,
+        IAntiforgery antiforgery,
+        string pathBase)
+    {
+        await antiforgery.ValidateRequestAsync(httpContext).ConfigureAwait(false);
+        await httpContext
+            .SignOutAsync(DashboardAuthenticationDefaults.AuthenticationScheme)
+            .ConfigureAwait(false);
+
+        return Results.LocalRedirect($"{pathBase}/login");
+    }
+
+    private static string RenderLoginPage(
+        HttpContext httpContext,
+        IAntiforgery antiforgery,
+        string returnUrl,
+        string pathBase,
+        string? failureMessage)
+    {
+        AntiforgeryTokenSet tokens = antiforgery.GetAndStoreTokens(httpContext);
+        string requestToken = tokens.RequestToken ?? string.Empty;
+        string alert = string.IsNullOrWhiteSpace(failureMessage)
+            ? string.Empty
+            : $"<p role=\"alert\">{HtmlEncoder.Default.Encode(failureMessage)}</p>";
+
+        string body = $"""
+            <section class="dashboard-login">
+                {alert}
+                <form method="post" action="{HtmlEncoder.Default.Encode(pathBase + "/login")}" class="card login-card">
+                    <div class="card-body">
+                        <input name="{tokens.FormFieldName}" type="hidden" value="{HtmlEncoder.Default.Encode(requestToken)}" />
+                        <input name="returnUrl" type="hidden" value="{HtmlEncoder.Default.Encode(returnUrl)}" />
+                        <div class="mb-3">
+                            <label for="apiKey" class="form-label">API key</label>
+                            <input id="apiKey" name="apiKey" type="password" autocomplete="off" class="form-control" />
+                        </div>
+                        <button type="submit" class="btn btn-primary">Sign in</button>
+                    </div>
+                </form>
+            </section>
+            """;
+
+        return RenderPage("Dashboard Sign In", body);
+    }
+
+    private static string RenderPage(string title, string body)
+    {
+        return $"""
+            <!doctype html>
+            <html lang="en">
+            <head>
+                <meta charset="utf-8" />
+                <meta name="viewport" content="width=device-width, initial-scale=1" />
+                <title>{HtmlEncoder.Default.Encode(title)}</title>
+                <link rel="stylesheet" href="/lib/bootstrap/css/bootstrap.min.css" />
+                <link rel="stylesheet" href="/css/dashboard.css" />
+            </head>
+            <body class="dashboard-body">
+                <main class="container py-5">
+                    <h1 class="h3 mb-4">{HtmlEncoder.Default.Encode(title)}</h1>
+                    {body}
+                </main>
+                <script src="/lib/bootstrap/js/bootstrap.bundle.min.js"></script>
+            </body>
+            </html>
+            """;
+    }
+
+    private static string NormalizePathBase(string pathBase)
+    {
+        string normalized = pathBase.TrimEnd('/');
+
+        return string.IsNullOrWhiteSpace(normalized) || !normalized.StartsWith("/", StringComparison.Ordinal)
+            ? "/dashboard"
+            : normalized;
+    }
+
+    private static string SanitizeReturnUrl(string? returnUrl, string pathBase)
+    {
+        if (string.IsNullOrWhiteSpace(returnUrl)
+            || !returnUrl.StartsWith("/", StringComparison.Ordinal)
+            || returnUrl.StartsWith("//", StringComparison.Ordinal)
+            || !returnUrl.StartsWith(pathBase, StringComparison.OrdinalIgnoreCase)
+            || Uri.TryCreate(returnUrl, UriKind.Absolute, out _))
+        {
+            return pathBase;
+        }
+
+        return returnUrl;
+    }
+}
@@ -0,0 +1,9 @@
+namespace MxGateway.Server.Dashboard;
+
+public sealed record DashboardFaultSummary(
+    string Source,
+    string? SessionId,
+    int? WorkerProcessId,
+    string State,
+    string Message,
+    DateTimeOffset ObservedAt);
@@ -0,0 +1,6 @@
+namespace MxGateway.Server.Dashboard;
+
+public sealed record DashboardMetricSummary(
+    string Name,
+    long Value,
+    string? Dimension = null);
@@ -0,0 +1,34 @@
+using MxGateway.Server.Diagnostics;
+
+namespace MxGateway.Server.Dashboard;
+
+internal static class DashboardRedactor
+{
+    private static readonly string[] SensitiveTextMarkers =
+    [
+        "apikey",
+        "api_key",
+        "authorization",
+        "credential",
+        "password",
+        "secret",
+        "token",
+    ];
+
+    public static string? Redact(string? value)
+    {
+        if (string.IsNullOrWhiteSpace(value))
+        {
+            return value;
+        }
+
+        if (value.Contains("mxgw_", StringComparison.OrdinalIgnoreCase))
+        {
+            return GatewayLogRedactor.RedactClientIdentity(value);
+        }
+
+        return SensitiveTextMarkers.Any(marker => value.Contains(marker, StringComparison.OrdinalIgnoreCase))
+            ? GatewayLogRedactor.RedactedValue
+            : value;
+    }
+}
@@ -0,0 +1,56 @@
+using Microsoft.AspNetCore.Authentication.Cookies;
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.Extensions.Options;
+using MxGateway.Server.Configuration;
+
+namespace MxGateway.Server.Dashboard;
+
+public static class DashboardServiceCollectionExtensions
+{
+    public static IServiceCollection AddGatewayDashboard(this IServiceCollection services)
+    {
+        services.AddSingleton<IDashboardSnapshotService, DashboardSnapshotService>();
+        services.AddSingleton<IDashboardAuthenticator, DashboardAuthenticator>();
+        services.AddHttpContextAccessor();
+        services.AddAntiforgery();
+        services.AddCascadingAuthenticationState();
+        services.AddRazorComponents()
+            .AddInteractiveServerComponents();
+        services
+            .AddAuthentication(DashboardAuthenticationDefaults.AuthenticationScheme)
+            .AddCookie(DashboardAuthenticationDefaults.AuthenticationScheme);
+        services.AddOptions<CookieAuthenticationOptions>(DashboardAuthenticationDefaults.AuthenticationScheme)
+            .Configure<IOptions<GatewayOptions>>(ConfigureCookieOptions);
+        services.AddAuthorization(options =>
+        {
+            options.AddPolicy(
+                DashboardAuthenticationDefaults.AuthorizationPolicy,
+                policy => policy.AddRequirements(new DashboardAuthorizationRequirement()));
+        });
+        services.AddSingleton<IAuthorizationHandler, DashboardAuthorizationHandler>();
+
+        return services;
+    }
+
+    private static void ConfigureCookieOptions(
+        CookieAuthenticationOptions cookieOptions,
+        IOptions<GatewayOptions> gatewayOptions)
+    {
+        string pathBase = gatewayOptions.Value.Dashboard.PathBase.TrimEnd('/');
+        if (string.IsNullOrWhiteSpace(pathBase))
+        {
+            pathBase = "/dashboard";
+        }
+
+        cookieOptions.Cookie.Name = DashboardAuthenticationDefaults.CookieName;
+        cookieOptions.Cookie.HttpOnly = true;
+        cookieOptions.Cookie.SecurePolicy = CookieSecurePolicy.Always;
+        cookieOptions.Cookie.SameSite = SameSiteMode.Strict;
+        cookieOptions.Cookie.Path = "/";
+        cookieOptions.LoginPath = $"{pathBase}/login";
+        cookieOptions.LogoutPath = $"{pathBase}/logout";
+        cookieOptions.AccessDeniedPath = $"{pathBase}/denied";
+        cookieOptions.ExpireTimeSpan = TimeSpan.FromHours(8);
+        cookieOptions.SlidingExpiration = true;
+    }
+}
@@ -0,0 +1,19 @@
+using MxGateway.Contracts.Proto;
+using MxGateway.Server.Workers;
+
+namespace MxGateway.Server.Dashboard;
+
+public sealed record DashboardSessionSummary(
+    string SessionId,
+    string BackendName,
+    SessionState State,
+    string? ClientIdentity,
+    string? ClientSessionName,
+    string? ClientCorrelationId,
+    DateTimeOffset OpenedAt,
+    DateTimeOffset LastClientActivityAt,
+    DateTimeOffset? LeaseExpiresAt,
+    int? WorkerProcessId,
+    WorkerClientState? WorkerState,
+    DateTimeOffset? LastWorkerHeartbeatAt,
+    string? LastFault);
@@ -0,0 +1,15 @@
+using MxGateway.Server.Configuration;
+
+namespace MxGateway.Server.Dashboard;
+
+public sealed record DashboardSnapshot(
+    DateTimeOffset GeneratedAt,
+    DateTimeOffset GatewayStartedAt,
+    TimeSpan GatewayUptime,
+    string GatewayStatus,
+    string GatewayVersion,
+    IReadOnlyList<DashboardSessionSummary> Sessions,
+    IReadOnlyList<DashboardWorkerSummary> Workers,
+    IReadOnlyList<DashboardMetricSummary> Metrics,
+    IReadOnlyList<DashboardFaultSummary> Faults,
+    EffectiveGatewayConfiguration Configuration);
@@ -0,0 +1,196 @@
+using System.Runtime.CompilerServices;
+using Microsoft.Extensions.Options;
+using MxGateway.Server.Configuration;
+using MxGateway.Server.Metrics;
+using MxGateway.Server.Sessions;
+using MxGateway.Server.Workers;
+
+namespace MxGateway.Server.Dashboard;
+
+public sealed class DashboardSnapshotService : IDashboardSnapshotService
+{
+    private const string HealthyStatus = "Healthy";
+
+    private readonly ISessionRegistry _sessionRegistry;
+    private readonly GatewayMetrics _metrics;
+    private readonly IGatewayConfigurationProvider _configurationProvider;
+    private readonly TimeProvider _timeProvider;
+    private readonly DateTimeOffset _gatewayStartedAt;
+    private readonly TimeSpan _snapshotInterval;
+    private readonly int _recentFaultLimit;
+    private readonly int _recentSessionLimit;
+
+    public DashboardSnapshotService(
+        ISessionRegistry sessionRegistry,
+        GatewayMetrics metrics,
+        IGatewayConfigurationProvider configurationProvider,
+        IOptions<GatewayOptions> options,
+        TimeProvider? timeProvider = null)
+    {
+        _sessionRegistry = sessionRegistry ?? throw new ArgumentNullException(nameof(sessionRegistry));
+        _metrics = metrics ?? throw new ArgumentNullException(nameof(metrics));
+        _configurationProvider = configurationProvider ?? throw new ArgumentNullException(nameof(configurationProvider));
+        ArgumentNullException.ThrowIfNull(options);
+
+        _timeProvider = timeProvider ?? TimeProvider.System;
+        _gatewayStartedAt = _timeProvider.GetUtcNow();
+        _snapshotInterval = TimeSpan.FromMilliseconds(options.Value.Dashboard.SnapshotIntervalMilliseconds);
+        _recentFaultLimit = options.Value.Dashboard.RecentFaultLimit;
+        _recentSessionLimit = options.Value.Dashboard.RecentSessionLimit;
+    }
+
+    public DashboardSnapshot GetSnapshot()
+    {
+        DateTimeOffset generatedAt = _timeProvider.GetUtcNow();
+        IReadOnlyList<GatewaySession> sessions = _sessionRegistry.Snapshot()
+            .OrderByDescending(session => session.OpenedAt)
+            .ToArray();
+        IReadOnlyList<DashboardSessionSummary> sessionSummaries = sessions
+            .Take(ResolveLimit(_recentSessionLimit))
+            .Select(CreateSessionSummary)
+            .ToArray();
+        IReadOnlyList<DashboardWorkerSummary> workerSummaries = sessions
+            .Where(session => session.WorkerClient is not null)
+            .Select(CreateWorkerSummary)
+            .ToArray();
+        GatewayMetricsSnapshot metricsSnapshot = _metrics.GetSnapshot();
+
+        return new DashboardSnapshot(
+            GeneratedAt: generatedAt,
+            GatewayStartedAt: _gatewayStartedAt,
+            GatewayUptime: generatedAt - _gatewayStartedAt,
+            GatewayStatus: HealthyStatus,
+            GatewayVersion: typeof(DashboardSnapshotService).Assembly.GetName().Version?.ToString() ?? "unknown",
+            Sessions: sessionSummaries,
+            Workers: workerSummaries,
+            Metrics: CreateMetricSummaries(metricsSnapshot),
+            Faults: CreateFaultSummaries(sessions, generatedAt),
+            Configuration: _configurationProvider.GetEffectiveConfiguration());
+    }
+
+    public async IAsyncEnumerable<DashboardSnapshot> WatchSnapshotsAsync(
+        [EnumeratorCancellation] CancellationToken cancellationToken)
+    {
+        if (cancellationToken.IsCancellationRequested)
+        {
+            yield break;
+        }
+
+        yield return GetSnapshot();
+
+        using PeriodicTimer timer = new(_snapshotInterval, _timeProvider);
+        while (true)
+        {
+            bool hasNext;
+            try
+            {
+                hasNext = await timer.WaitForNextTickAsync(cancellationToken).ConfigureAwait(false);
+            }
+            catch (OperationCanceledException)
+            {
+                yield break;
+            }
+
+            if (!hasNext)
+            {
+                yield break;
+            }
+
+            yield return GetSnapshot();
+        }
+    }
+
+    private static DashboardSessionSummary CreateSessionSummary(GatewaySession session)
+    {
+        IWorkerClient? workerClient = session.WorkerClient;
+
+        return new DashboardSessionSummary(
+            SessionId: session.SessionId,
+            BackendName: session.BackendName,
+            State: session.State,
+            ClientIdentity: DashboardRedactor.Redact(session.ClientIdentity),
+            ClientSessionName: DashboardRedactor.Redact(session.ClientSessionName),
+            ClientCorrelationId: DashboardRedactor.Redact(session.ClientCorrelationId),
+            OpenedAt: session.OpenedAt,
+            LastClientActivityAt: session.LastClientActivityAt,
+            LeaseExpiresAt: session.LeaseExpiresAt,
+            WorkerProcessId: workerClient?.ProcessId,
+            WorkerState: workerClient?.State,
+            LastWorkerHeartbeatAt: workerClient?.LastHeartbeatAt,
+            LastFault: DashboardRedactor.Redact(session.FinalFault));
+    }
+
+    private static DashboardWorkerSummary CreateWorkerSummary(GatewaySession session)
+    {
+        IWorkerClient workerClient = session.WorkerClient!;
+
+        return new DashboardWorkerSummary(
+            SessionId: session.SessionId,
+            ProcessId: workerClient.ProcessId,
+            State: workerClient.State,
+            LastHeartbeatAt: workerClient.LastHeartbeatAt,
+            LastFault: DashboardRedactor.Redact(session.FinalFault));
+    }
+
+    private static IReadOnlyList<DashboardMetricSummary> CreateMetricSummaries(GatewayMetricsSnapshot snapshot)
+    {
+        List<DashboardMetricSummary> metrics =
+        [
+            new("mxgateway.sessions.open", snapshot.OpenSessions),
+            new("mxgateway.workers.running", snapshot.WorkersRunning),
+            new("mxgateway.events.queue.depth", snapshot.EventQueueDepth),
+            new("mxgateway.sessions.opened", snapshot.SessionsOpened),
+            new("mxgateway.sessions.closed", snapshot.SessionsClosed),
+            new("mxgateway.commands.started", snapshot.CommandsStarted),
+            new("mxgateway.commands.succeeded", snapshot.CommandsSucceeded),
+            new("mxgateway.commands.failed", snapshot.CommandsFailed),
+            new("mxgateway.events.received", snapshot.EventsReceived),
+            new("mxgateway.queues.overflows", snapshot.QueueOverflows),
+            new("mxgateway.faults", snapshot.Faults),
+            new("mxgateway.workers.killed", snapshot.WorkerKills),
+            new("mxgateway.workers.exited", snapshot.WorkerExits),
+            new("mxgateway.heartbeats.failed", snapshot.HeartbeatFailures),
+            new("mxgateway.grpc.streams.disconnected", snapshot.StreamDisconnects),
+        ];
+
+        metrics.AddRange(snapshot.CommandFailuresByMethod
+            .OrderBy(entry => entry.Key, StringComparer.OrdinalIgnoreCase)
+            .Select(entry => new DashboardMetricSummary("mxgateway.commands.failed", entry.Value, entry.Key)));
+        metrics.AddRange(snapshot.EventsByFamily
+            .OrderBy(entry => entry.Key, StringComparer.OrdinalIgnoreCase)
+            .Select(entry => new DashboardMetricSummary("mxgateway.events.received", entry.Value, entry.Key)));
+
+        return metrics;
+    }
+
+    private IReadOnlyList<DashboardFaultSummary> CreateFaultSummaries(
+        IReadOnlyList<GatewaySession> sessions,
+        DateTimeOffset generatedAt)
+    {
+        return sessions
+            .Where(HasFault)
+            .Take(ResolveLimit(_recentFaultLimit))
+            .Select(session => new DashboardFaultSummary(
+                Source: session.WorkerClient?.State == WorkerClientState.Faulted ? "Worker" : "Session",
+                SessionId: session.SessionId,
+                WorkerProcessId: session.WorkerProcessId,
+                State: session.WorkerClient?.State == WorkerClientState.Faulted
+                    ? WorkerClientState.Faulted.ToString()
+                    : session.State.ToString(),
+                Message: DashboardRedactor.Redact(session.FinalFault) ?? "Faulted",
+                ObservedAt: generatedAt))
+            .ToArray();
+    }
+
+    private static bool HasFault(GatewaySession session)
+    {
+        return session.State == MxGateway.Contracts.Proto.SessionState.Faulted
+            || session.WorkerClient?.State == WorkerClientState.Faulted
+            || !string.IsNullOrWhiteSpace(session.FinalFault);
+    }
+
+    private static int ResolveLimit(int configuredLimit)
+    {
+        return configuredLimit < 0 ? 0 : configuredLimit;
+    }
+}
@@ -0,0 +1,10 @@
+using MxGateway.Server.Workers;
+
+namespace MxGateway.Server.Dashboard;
+
+public sealed record DashboardWorkerSummary(
+    string SessionId,
+    int? ProcessId,
+    WorkerClientState State,
+    DateTimeOffset LastHeartbeatAt,
+    string? LastFault);
@@ -0,0 +1,8 @@
+namespace MxGateway.Server.Dashboard;
+
+public interface IDashboardAuthenticator
+{
+    Task<DashboardAuthenticationResult> AuthenticateAsync(
+        string? apiKey,
+        CancellationToken cancellationToken);
+}
@@ -0,0 +1,8 @@
+namespace MxGateway.Server.Dashboard;
+
+public interface IDashboardSnapshotService
+{
+    DashboardSnapshot GetSnapshot();
+
+    IAsyncEnumerable<DashboardSnapshot> WatchSnapshotsAsync(CancellationToken cancellationToken);
+}
@@ -1,8 +1,12 @@
 using MxGateway.Contracts;
 using MxGateway.Server.Configuration;
+using MxGateway.Server.Dashboard;
 using MxGateway.Server.Diagnostics;
+using MxGateway.Server.Grpc;
 using MxGateway.Server.Metrics;
 using MxGateway.Server.Security.Authentication;
+using MxGateway.Server.Security.Authorization;
+using MxGateway.Server.Sessions;
 using MxGateway.Server.Workers;

 namespace MxGateway.Server;
@@ -15,6 +19,10 @@ public static class GatewayApplication
        WebApplication app = builder.Build();

        app.UseGatewayRequestLoggingScope();
+        app.UseStaticFiles();
+        app.UseAuthentication();
+        app.UseAuthorization();
+        app.UseAntiforgery();
        app.MapGatewayEndpoints();

        return app;
@@ -26,9 +34,15 @@ public static class GatewayApplication

        builder.Services.AddGatewayConfiguration();
        builder.Services.AddSqliteAuthStore();
+        builder.Services.AddGatewayGrpcAuthorization();
        builder.Services.AddHealthChecks();
        builder.Services.AddSingleton<GatewayMetrics>();
+        builder.Services.AddSingleton<MxAccessGrpcMapper>();
+        builder.Services.AddSingleton<MxAccessGrpcRequestValidator>();
+        builder.Services.AddSingleton<IEventStreamService, EventStreamService>();
        builder.Services.AddWorkerProcessLauncher();
+        builder.Services.AddGatewaySessions();
+        builder.Services.AddGatewayDashboard();

        return builder;
    }
@@ -45,6 +59,9 @@ public static class GatewayApplication
                    WorkerProtocolVersion: GatewayContractInfo.WorkerProtocolVersion)))
            .WithName("LiveHealth");

+        endpoints.MapGrpcService<MxAccessGatewayService>();
+        endpoints.MapGatewayDashboard();
+
        return endpoints;
    }
 }
@@ -0,0 +1,140 @@
+using System.Runtime.CompilerServices;
+using System.Threading.Channels;
+using Microsoft.Extensions.Options;
+using MxGateway.Contracts.Proto;
+using MxGateway.Server.Configuration;
+using MxGateway.Server.Metrics;
+using MxGateway.Server.Sessions;
+using MxGateway.Server.Workers;
+
+namespace MxGateway.Server.Grpc;
+
+public sealed class EventStreamService(
+    ISessionManager sessionManager,
+    IOptions<GatewayOptions> options,
+    MxAccessGrpcMapper mapper,
+    GatewayMetrics metrics,
+    ILogger<EventStreamService> logger) : IEventStreamService
+{
+    public async IAsyncEnumerable<MxEvent> StreamEventsAsync(
+        StreamEventsRequest request,
+        [EnumeratorCancellation] CancellationToken cancellationToken)
+    {
+        if (!sessionManager.TryGetSession(request.SessionId, out GatewaySession session))
+        {
+            throw new SessionManagerException(
+                SessionManagerErrorCode.SessionNotFound,
+                $"Session {request.SessionId} was not found.");
+        }
+
+        using IDisposable subscriber = session.AttachEventSubscriber(
+            options.Value.Sessions.AllowMultipleEventSubscribers);
+        using CancellationTokenSource streamCts = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken);
+
+        int streamQueueDepth = 0;
+        Channel<MxEvent> eventQueue = Channel.CreateBounded<MxEvent>(
+            new BoundedChannelOptions(options.Value.Events.QueueCapacity)
+            {
+                SingleReader = true,
+                SingleWriter = true,
+                FullMode = BoundedChannelFullMode.Wait,
+                AllowSynchronousContinuations = false,
+            });
+        Task producerTask = ProduceEventsAsync(
+            session,
+            request.AfterWorkerSequence,
+            eventQueue.Writer,
+            () =>
+            {
+                int depth = Interlocked.Increment(ref streamQueueDepth);
+                metrics.SetEventQueueDepth(depth);
+            },
+            streamCts.Token);
+
+        try
+        {
+            await foreach (MxEvent mxEvent in eventQueue.Reader.ReadAllAsync(cancellationToken).ConfigureAwait(false))
+            {
+                int depth = Math.Max(0, Interlocked.Decrement(ref streamQueueDepth));
+                metrics.SetEventQueueDepth(depth);
+                yield return mxEvent;
+            }
+
+            await producerTask.ConfigureAwait(false);
+        }
+        finally
+        {
+            await streamCts.CancelAsync().ConfigureAwait(false);
+            subscriber.Dispose();
+            metrics.StreamDisconnected("Detached");
+
+            try
+            {
+                await producerTask.ConfigureAwait(false);
+            }
+            catch (OperationCanceledException) when (streamCts.IsCancellationRequested)
+            {
+            }
+            catch (Exception exception)
+            {
+                logger.LogDebug(
+                    exception,
+                    "Event stream producer stopped for session {SessionId}.",
+                    request.SessionId);
+            }
+        }
+    }
+
+    private async Task ProduceEventsAsync(
+        GatewaySession session,
+        ulong afterWorkerSequence,
+        ChannelWriter<MxEvent> writer,
+        Action eventQueued,
+        CancellationToken cancellationToken)
+    {
+        try
+        {
+            await foreach (WorkerEvent workerEvent in session
+                .ReadEventsAsync(cancellationToken)
+                .WithCancellation(cancellationToken)
+                .ConfigureAwait(false))
+            {
+                MxEvent publicEvent = mapper.MapEvent(workerEvent);
+                if (publicEvent.WorkerSequence <= afterWorkerSequence)
+                {
+                    continue;
+                }
+
+                if (!writer.TryWrite(publicEvent))
+                {
+                    string message = $"Session {session.SessionId} event stream queue overflowed.";
+                    session.MarkFaulted(message);
+                    metrics.QueueOverflow("grpc-event-stream");
+                    metrics.Fault(SessionManagerErrorCode.EventQueueOverflow.ToString());
+                    writer.TryComplete(new SessionManagerException(
+                        SessionManagerErrorCode.EventQueueOverflow,
+                        message));
+                    return;
+                }
+
+                eventQueued();
+            }
+
+            writer.TryComplete();
+        }
+        catch (OperationCanceledException) when (cancellationToken.IsCancellationRequested)
+        {
+            writer.TryComplete();
+        }
+        catch (Exception exception)
+        {
+            if (exception is WorkerClientException)
+            {
+                session.MarkFaulted(exception.Message);
+                metrics.Fault(WorkerClientErrorCode.WorkerFaulted.ToString());
+            }
+
+            writer.TryComplete(exception);
+        }
+    }
+}
@@ -0,0 +1,10 @@
+using MxGateway.Contracts.Proto;
+
+namespace MxGateway.Server.Grpc;
+
+public interface IEventStreamService
+{
+    IAsyncEnumerable<MxEvent> StreamEventsAsync(
+        StreamEventsRequest request,
+        CancellationToken cancellationToken);
+}
@@ -0,0 +1,177 @@
+using Grpc.Core;
+using MxGateway.Contracts;
+using MxGateway.Contracts.Proto;
+using MxGateway.Server.Security.Authorization;
+using MxGateway.Server.Sessions;
+using MxGateway.Server.Workers;
+
+namespace MxGateway.Server.Grpc;
+
+public sealed class MxAccessGatewayService(
+    ISessionManager sessionManager,
+    IGatewayRequestIdentityAccessor identityAccessor,
+    MxAccessGrpcRequestValidator requestValidator,
+    MxAccessGrpcMapper mapper,
+    IEventStreamService eventStreamService,
+    ILogger<MxAccessGatewayService> logger) : MxAccessGateway.MxAccessGatewayBase
+{
+    public override async Task<OpenSessionReply> OpenSession(
+        OpenSessionRequest request,
+        ServerCallContext context)
+    {
+        try
+        {
+            requestValidator.ValidateOpenSession(request);
+            GatewaySession session = await sessionManager
+                .OpenSessionAsync(
+                    SessionOpenRequest.FromContract(request),
+                    ResolveClientIdentity(),
+                    context.CancellationToken)
+                .ConfigureAwait(false);
+
+            OpenSessionReply reply = new()
+            {
+                SessionId = session.SessionId,
+                BackendName = session.BackendName,
+                WorkerProcessId = session.WorkerProcessId ?? 0,
+                WorkerProtocolVersion = GatewayContractInfo.WorkerProtocolVersion,
+                GatewayProtocolVersion = GatewayContractInfo.GatewayProtocolVersion,
+                DefaultCommandTimeout = Google.Protobuf.WellKnownTypes.Duration.FromTimeSpan(session.CommandTimeout),
+                ProtocolStatus = MxAccessGrpcMapper.Ok(),
+            };
+            reply.Capabilities.Add("unary-open-session");
+            reply.Capabilities.Add("unary-close-session");
+            reply.Capabilities.Add("unary-invoke");
+            reply.Capabilities.Add("server-stream-events");
+
+            return reply;
+        }
+        catch (Exception exception) when (exception is not RpcException)
+        {
+            throw MapException(exception);
+        }
+    }
+
+    public override async Task<CloseSessionReply> CloseSession(
+        CloseSessionRequest request,
+        ServerCallContext context)
+    {
+        try
+        {
+            requestValidator.ValidateCloseSession(request);
+            SessionCloseResult result = await sessionManager
+                .CloseSessionAsync(request.SessionId, context.CancellationToken)
+                .ConfigureAwait(false);
+
+            return new CloseSessionReply
+            {
+                SessionId = result.SessionId,
+                FinalState = result.FinalState,
+                ProtocolStatus = MxAccessGrpcMapper.Ok(result.AlreadyClosed ? "Session was already closed." : "Session closed."),
+            };
+        }
+        catch (Exception exception) when (exception is not RpcException)
+        {
+            throw MapException(exception);
+        }
+    }
+
+    public override async Task<MxCommandReply> Invoke(
+        MxCommandRequest request,
+        ServerCallContext context)
+    {
+        try
+        {
+            requestValidator.ValidateInvoke(request);
+            WorkerCommand workerCommand = mapper.MapCommand(request);
+            WorkerCommandReply workerReply = await sessionManager
+                .InvokeAsync(request.SessionId, workerCommand, context.CancellationToken)
+                .ConfigureAwait(false);
+
+            return mapper.MapCommandReply(workerReply);
+        }
+        catch (Exception exception) when (exception is not RpcException)
+        {
+            throw MapException(exception);
+        }
+    }
+
+    public override async Task StreamEvents(
+        StreamEventsRequest request,
+        IServerStreamWriter<MxEvent> responseStream,
+        ServerCallContext context)
+    {
+        try
+        {
+            requestValidator.ValidateStreamEvents(request);
+            await foreach (MxEvent publicEvent in eventStreamService
+                .StreamEventsAsync(request, context.CancellationToken)
+                .WithCancellation(context.CancellationToken)
+                .ConfigureAwait(false))
+            {
+                await responseStream.WriteAsync(publicEvent).ConfigureAwait(false);
+            }
+        }
+        catch (Exception exception) when (exception is not RpcException)
+        {
+            throw MapException(exception);
+        }
+    }
+
+    private string? ResolveClientIdentity()
+    {
+        return identityAccessor.Current?.DisplayName ?? identityAccessor.Current?.KeyId;
+    }
+
+    private RpcException MapException(Exception exception)
+    {
+        if (exception is OperationCanceledException)
+        {
+            return new RpcException(new Status(StatusCode.Cancelled, "gRPC request was canceled."));
+        }
+
+        if (exception is SessionManagerException sessionException)
+        {
+            return MapSessionException(sessionException);
+        }
+
+        if (exception is WorkerClientException workerClientException)
+        {
+            return MapWorkerClientException(workerClientException);
+        }
+
+        logger.LogWarning(exception, "Public gRPC request failed.");
+        return new RpcException(new Status(StatusCode.Unavailable, "Gateway request failed before an MXAccess reply was available."));
+    }
+
+    private static RpcException MapSessionException(SessionManagerException exception)
+    {
+        StatusCode statusCode = exception.ErrorCode switch
+        {
+            SessionManagerErrorCode.SessionNotFound => StatusCode.NotFound,
+            SessionManagerErrorCode.SessionNotReady => StatusCode.FailedPrecondition,
+            SessionManagerErrorCode.EventSubscriberAlreadyActive => StatusCode.ResourceExhausted,
+            SessionManagerErrorCode.EventQueueOverflow => StatusCode.ResourceExhausted,
+            SessionManagerErrorCode.SessionLimitExceeded => StatusCode.ResourceExhausted,
+            SessionManagerErrorCode.OpenFailed => StatusCode.Unavailable,
+            SessionManagerErrorCode.CloseFailed => StatusCode.Unavailable,
+            _ => StatusCode.Unavailable,
+        };
+
+        return new RpcException(new Status(statusCode, exception.Message));
+    }
+
+    private static RpcException MapWorkerClientException(WorkerClientException exception)
+    {
+        StatusCode statusCode = exception.ErrorCode switch
+        {
+            WorkerClientErrorCode.CommandTimeout => StatusCode.DeadlineExceeded,
+            WorkerClientErrorCode.GatewayShutdown => StatusCode.Cancelled,
+            WorkerClientErrorCode.InvalidState => StatusCode.FailedPrecondition,
+            WorkerClientErrorCode.ProtocolViolation => StatusCode.Internal,
+            _ => StatusCode.Unavailable,
+        };
+
+        return new RpcException(new Status(statusCode, exception.Message));
+    }
+}
@@ -0,0 +1,124 @@
+using Google.Protobuf.WellKnownTypes;
+using MxGateway.Contracts.Proto;
+
+namespace MxGateway.Server.Grpc;
+
+public sealed class MxAccessGrpcMapper
+{
+    private readonly TimeProvider _timeProvider;
+
+    public MxAccessGrpcMapper(TimeProvider? timeProvider = null)
+    {
+        _timeProvider = timeProvider ?? TimeProvider.System;
+    }
+
+    public WorkerCommand MapCommand(MxCommandRequest request)
+    {
+        ArgumentNullException.ThrowIfNull(request);
+        ArgumentNullException.ThrowIfNull(request.Command);
+
+        return new WorkerCommand
+        {
+            Command = request.Command.Clone(),
+            EnqueueTimestamp = Timestamp.FromDateTimeOffset(_timeProvider.GetUtcNow()),
+        };
+    }
+
+    public MxCommandReply MapCommandReply(WorkerCommandReply reply)
+    {
+        ArgumentNullException.ThrowIfNull(reply);
+
+        if (reply.Reply is null)
+        {
+            return new MxCommandReply
+            {
+                ProtocolStatus = ProtocolViolation("Worker command reply did not contain a public reply payload."),
+            };
+        }
+
+        return reply.Reply.Clone();
+    }
+
+    public MxEvent MapEvent(WorkerEvent workerEvent)
+    {
+        ArgumentNullException.ThrowIfNull(workerEvent);
+
+        return workerEvent.Event?.Clone() ?? new MxEvent
+        {
+            Family = MxEventFamily.Unspecified,
+            RawStatus = "Worker event did not contain a public event payload.",
+        };
+    }
+
+    public static ProtocolStatus Ok(string message = "OK")
+    {
+        return new ProtocolStatus
+        {
+            Code = ProtocolStatusCode.Ok,
+            Message = message,
+        };
+    }
+
+    public static ProtocolStatus InvalidRequest(string message)
+    {
+        return new ProtocolStatus
+        {
+            Code = ProtocolStatusCode.InvalidRequest,
+            Message = message,
+        };
+    }
+
+    public static ProtocolStatus SessionNotFound(string message)
+    {
+        return new ProtocolStatus
+        {
+            Code = ProtocolStatusCode.SessionNotFound,
+            Message = message,
+        };
+    }
+
+    public static ProtocolStatus SessionNotReady(string message)
+    {
+        return new ProtocolStatus
+        {
+            Code = ProtocolStatusCode.SessionNotReady,
+            Message = message,
+        };
+    }
+
+    public static ProtocolStatus WorkerUnavailable(string message)
+    {
+        return new ProtocolStatus
+        {
+            Code = ProtocolStatusCode.WorkerUnavailable,
+            Message = message,
+        };
+    }
+
+    public static ProtocolStatus Timeout(string message)
+    {
+        return new ProtocolStatus
+        {
+            Code = ProtocolStatusCode.Timeout,
+            Message = message,
+        };
+    }
+
+    public static ProtocolStatus Canceled(string message)
+    {
+        return new ProtocolStatus
+        {
+            Code = ProtocolStatusCode.Canceled,
+            Message = message,
+        };
+    }
+
+    public static ProtocolStatus ProtocolViolation(string message)
+    {
+        return new ProtocolStatus
+        {
+            Code = ProtocolStatusCode.ProtocolViolation,
+            Message = message,
+        };
+    }
+}
@@ -0,0 +1,101 @@
+using Grpc.Core;
+using MxGateway.Contracts.Proto;
+
+namespace MxGateway.Server.Grpc;
+
+public sealed class MxAccessGrpcRequestValidator
+{
+    public void ValidateOpenSession(OpenSessionRequest request)
+    {
+        ArgumentNullException.ThrowIfNull(request);
+
+        if (request.CommandTimeout is not null && request.CommandTimeout.ToTimeSpan() <= TimeSpan.Zero)
+        {
+            throw InvalidArgument("Command timeout must be greater than zero when provided.");
+        }
+    }
+
+    public void ValidateCloseSession(CloseSessionRequest request)
+    {
+        ArgumentNullException.ThrowIfNull(request);
+        RequireSessionId(request.SessionId);
+    }
+
+    public void ValidateStreamEvents(StreamEventsRequest request)
+    {
+        ArgumentNullException.ThrowIfNull(request);
+        RequireSessionId(request.SessionId);
+    }
+
+    public void ValidateInvoke(MxCommandRequest request)
+    {
+        ArgumentNullException.ThrowIfNull(request);
+        RequireSessionId(request.SessionId);
+
+        if (request.Command is null)
+        {
+            throw InvalidArgument("Invoke requires a command payload.");
+        }
+
+        if (request.Command.Kind is MxCommandKind.Unspecified)
+        {
+            throw InvalidArgument("Invoke requires a command kind.");
+        }
+
+        ValidateCommandPayload(request.Command);
+    }
+
+    private static void RequireSessionId(string sessionId)
+    {
+        if (string.IsNullOrWhiteSpace(sessionId))
+        {
+            throw InvalidArgument("Session id is required.");
+        }
+    }
+
+    private static void ValidateCommandPayload(MxCommand command)
+    {
+        MxCommand.PayloadOneofCase expectedPayload = ExpectedPayload(command.Kind);
+        if (command.PayloadCase != expectedPayload)
+        {
+            throw InvalidArgument(
+                $"Command kind {command.Kind} requires payload {expectedPayload} but received {command.PayloadCase}.");
+        }
+    }
+
+    private static MxCommand.PayloadOneofCase ExpectedPayload(MxCommandKind kind)
+    {
+        return kind switch
+        {
+            MxCommandKind.Register => MxCommand.PayloadOneofCase.Register,
+            MxCommandKind.Unregister => MxCommand.PayloadOneofCase.Unregister,
+            MxCommandKind.AddItem => MxCommand.PayloadOneofCase.AddItem,
+            MxCommandKind.AddItem2 => MxCommand.PayloadOneofCase.AddItem2,
+            MxCommandKind.RemoveItem => MxCommand.PayloadOneofCase.RemoveItem,
+            MxCommandKind.Advise => MxCommand.PayloadOneofCase.Advise,
+            MxCommandKind.UnAdvise => MxCommand.PayloadOneofCase.UnAdvise,
+            MxCommandKind.AdviseSupervisory => MxCommand.PayloadOneofCase.AdviseSupervisory,
+            MxCommandKind.AddBufferedItem => MxCommand.PayloadOneofCase.AddBufferedItem,
+            MxCommandKind.SetBufferedUpdateInterval => MxCommand.PayloadOneofCase.SetBufferedUpdateInterval,
+            MxCommandKind.Suspend => MxCommand.PayloadOneofCase.Suspend,
+            MxCommandKind.Activate => MxCommand.PayloadOneofCase.Activate,
+            MxCommandKind.Write => MxCommand.PayloadOneofCase.Write,
+            MxCommandKind.Write2 => MxCommand.PayloadOneofCase.Write2,
+            MxCommandKind.WriteSecured => MxCommand.PayloadOneofCase.WriteSecured,
+            MxCommandKind.WriteSecured2 => MxCommand.PayloadOneofCase.WriteSecured2,
+            MxCommandKind.AuthenticateUser => MxCommand.PayloadOneofCase.AuthenticateUser,
+            MxCommandKind.ArchestraUserToId => MxCommand.PayloadOneofCase.ArchestraUserToId,
+            MxCommandKind.Ping => MxCommand.PayloadOneofCase.Ping,
+            MxCommandKind.GetSessionState => MxCommand.PayloadOneofCase.GetSessionState,
+            MxCommandKind.GetWorkerInfo => MxCommand.PayloadOneofCase.GetWorkerInfo,
+            MxCommandKind.DrainEvents => MxCommand.PayloadOneofCase.DrainEvents,
+            MxCommandKind.ShutdownWorker => MxCommand.PayloadOneofCase.ShutdownWorker,
+            _ => MxCommand.PayloadOneofCase.None,
+        };
+    }
+
+    private static RpcException InvalidArgument(string detail)
+    {
+        return new RpcException(new Status(StatusCode.InvalidArgument, detail));
+    }
+}
@@ -5,6 +5,7 @@
  </PropertyGroup>

  <ItemGroup>
+    <PackageReference Include="Grpc.AspNetCore" Version="2.76.0" />
    <PackageReference Include="Microsoft.Data.Sqlite" Version="10.0.7" />
  </ItemGroup>

@@ -0,0 +1,74 @@
+using Grpc.Core;
+using Grpc.Core.Interceptors;
+using Microsoft.Extensions.Options;
+using MxGateway.Server.Configuration;
+using MxGateway.Server.Security.Authentication;
+
+namespace MxGateway.Server.Security.Authorization;
+
+public sealed class GatewayGrpcAuthorizationInterceptor(
+    IApiKeyVerifier apiKeyVerifier,
+    GatewayGrpcScopeResolver scopeResolver,
+    IGatewayRequestIdentityAccessor identityAccessor,
+    IOptions<GatewayOptions> options) : Interceptor
+{
+    public override async Task<TResponse> UnaryServerHandler<TRequest, TResponse>(
+        TRequest request,
+        ServerCallContext context,
+        UnaryServerMethod<TRequest, TResponse> continuation)
+    {
+        ApiKeyIdentity? identity = await AuthenticateAndAuthorizeAsync(request, context).ConfigureAwait(false);
+        IDisposable? identityScope = identity is null ? null : identityAccessor.Push(identity);
+        using (identityScope)
+        {
+            return await continuation(request, context).ConfigureAwait(false);
+        }
+    }
+
+    public override async Task ServerStreamingServerHandler<TRequest, TResponse>(
+        TRequest request,
+        IServerStreamWriter<TResponse> responseStream,
+        ServerCallContext context,
+        ServerStreamingServerMethod<TRequest, TResponse> continuation)
+    {
+        ApiKeyIdentity? identity = await AuthenticateAndAuthorizeAsync(request, context).ConfigureAwait(false);
+        IDisposable? identityScope = identity is null ? null : identityAccessor.Push(identity);
+        using (identityScope)
+        {
+            await continuation(request, responseStream, context).ConfigureAwait(false);
+        }
+    }
+
+    private async Task<ApiKeyIdentity?> AuthenticateAndAuthorizeAsync<TRequest>(
+        TRequest request,
+        ServerCallContext context)
+        where TRequest : class
+    {
+        if (options.Value.Authentication.Mode == AuthenticationMode.Disabled)
+        {
+            return null;
+        }
+
+        string? authorizationHeader = context.RequestHeaders.GetValue("authorization");
+        ApiKeyVerificationResult verificationResult = await apiKeyVerifier
+            .VerifyAsync(authorizationHeader, context.CancellationToken)
+            .ConfigureAwait(false);
+
+        if (!verificationResult.Succeeded || verificationResult.Identity is null)
+        {
+            throw new RpcException(new Status(
+                StatusCode.Unauthenticated,
+                "Missing or invalid API key."));
+        }
+
+        string requiredScope = scopeResolver.ResolveRequiredScope(request);
+        if (!verificationResult.Identity.Scopes.Contains(requiredScope))
+        {
+            throw new RpcException(new Status(
+                StatusCode.PermissionDenied,
+                $"API key is missing required scope '{requiredScope}'."));
+        }
+
+        return verificationResult.Identity;
+    }
+}
@@ -0,0 +1,40 @@
+using MxGateway.Contracts.Proto;
+
+namespace MxGateway.Server.Security.Authorization;
+
+public sealed class GatewayGrpcScopeResolver
+{
+    public string ResolveRequiredScope(object request)
+    {
+        return request switch
+        {
+            OpenSessionRequest => GatewayScopes.SessionOpen,
+            CloseSessionRequest => GatewayScopes.SessionClose,
+            StreamEventsRequest => GatewayScopes.EventsRead,
+            MxCommandRequest commandRequest => ResolveCommandScope(commandRequest.Command?.Kind ?? MxCommandKind.Unspecified),
+            _ => GatewayScopes.Admin
+        };
+    }
+
+    private static string ResolveCommandScope(MxCommandKind kind)
+    {
+        return kind switch
+        {
+            MxCommandKind.Write or
+            MxCommandKind.Write2 => GatewayScopes.InvokeWrite,
+
+            MxCommandKind.WriteSecured or
+            MxCommandKind.WriteSecured2 or
+            MxCommandKind.AuthenticateUser => GatewayScopes.InvokeSecure,
+
+            MxCommandKind.ArchestraUserToId or
+            MxCommandKind.GetSessionState or
+            MxCommandKind.GetWorkerInfo => GatewayScopes.MetadataRead,
+
+            MxCommandKind.DrainEvents => GatewayScopes.EventsRead,
+            MxCommandKind.ShutdownWorker => GatewayScopes.Admin,
+
+            _ => GatewayScopes.InvokeRead
+        };
+    }
+}
@@ -0,0 +1,38 @@
+using MxGateway.Server.Security.Authentication;
+
+namespace MxGateway.Server.Security.Authorization;
+
+public sealed class GatewayRequestIdentityAccessor : IGatewayRequestIdentityAccessor
+{
+    private readonly AsyncLocal<ApiKeyIdentity?> currentIdentity = new();
+
+    public ApiKeyIdentity? Current => currentIdentity.Value;
+
+    public IDisposable Push(ApiKeyIdentity identity)
+    {
+        ArgumentNullException.ThrowIfNull(identity);
+
+        ApiKeyIdentity? previousIdentity = currentIdentity.Value;
+        currentIdentity.Value = identity;
+
+        return new IdentityScope(this, previousIdentity);
+    }
+
+    private sealed class IdentityScope(
+        GatewayRequestIdentityAccessor accessor,
+        ApiKeyIdentity? previousIdentity) : IDisposable
+    {
+        private bool disposed;
+
+        public void Dispose()
+        {
+            if (disposed)
+            {
+                return;
+            }
+
+            accessor.currentIdentity.Value = previousIdentity;
+            disposed = true;
+        }
+    }
+}
@@ -0,0 +1,13 @@
+namespace MxGateway.Server.Security.Authorization;
+
+public static class GatewayScopes
+{
+    public const string SessionOpen = "session:open";
+    public const string SessionClose = "session:close";
+    public const string InvokeRead = "invoke:read";
+    public const string InvokeWrite = "invoke:write";
+    public const string InvokeSecure = "invoke:secure";
+    public const string EventsRead = "events:read";
+    public const string MetadataRead = "metadata:read";
+    public const string Admin = "admin";
+}
@@ -0,0 +1,16 @@
+using Grpc.Core.Interceptors;
+
+namespace MxGateway.Server.Security.Authorization;
+
+public static class GrpcAuthorizationServiceCollectionExtensions
+{
+    public static IServiceCollection AddGatewayGrpcAuthorization(this IServiceCollection services)
+    {
+        services.AddSingleton<GatewayGrpcScopeResolver>();
+        services.AddSingleton<IGatewayRequestIdentityAccessor, GatewayRequestIdentityAccessor>();
+        services.AddSingleton<GatewayGrpcAuthorizationInterceptor>();
+        services.AddGrpc(options => options.Interceptors.Add<GatewayGrpcAuthorizationInterceptor>());
+
+        return services;
+    }
+}
@@ -0,0 +1,10 @@
+using MxGateway.Server.Security.Authentication;
+
+namespace MxGateway.Server.Security.Authorization;
+
+public interface IGatewayRequestIdentityAccessor
+{
+    ApiKeyIdentity? Current { get; }
+
+    IDisposable Push(ApiKeyIdentity identity);
+}
@@ -0,0 +1,352 @@
+using MxGateway.Contracts.Proto;
+using MxGateway.Server.Workers;
+
+namespace MxGateway.Server.Sessions;
+
+public sealed class GatewaySession
+{
+    private readonly object _syncRoot = new();
+    private readonly SemaphoreSlim _closeLock = new(1, 1);
+    private IWorkerClient? _workerClient;
+    private SessionState _state = SessionState.Creating;
+    private string? _finalFault;
+    private DateTimeOffset _lastClientActivityAt;
+    private DateTimeOffset? _leaseExpiresAt;
+    private bool _closeStarted;
+    private int _activeEventSubscriberCount;
+
+    public GatewaySession(
+        string sessionId,
+        string backendName,
+        string pipeName,
+        string nonce,
+        string? clientIdentity,
+        string? clientSessionName,
+        string? clientCorrelationId,
+        TimeSpan commandTimeout,
+        TimeSpan startupTimeout,
+        TimeSpan shutdownTimeout,
+        DateTimeOffset openedAt)
+    {
+        if (string.IsNullOrWhiteSpace(sessionId))
+        {
+            throw new ArgumentException("Session id is required.", nameof(sessionId));
+        }
+
+        if (string.IsNullOrWhiteSpace(backendName))
+        {
+            throw new ArgumentException("Backend name is required.", nameof(backendName));
+        }
+
+        if (string.IsNullOrWhiteSpace(pipeName))
+        {
+            throw new ArgumentException("Pipe name is required.", nameof(pipeName));
+        }
+
+        if (string.IsNullOrWhiteSpace(nonce))
+        {
+            throw new ArgumentException("Nonce is required.", nameof(nonce));
+        }
+
+        SessionId = sessionId;
+        BackendName = backendName;
+        PipeName = pipeName;
+        Nonce = nonce;
+        ClientIdentity = clientIdentity;
+        ClientSessionName = clientSessionName;
+        ClientCorrelationId = clientCorrelationId;
+        CommandTimeout = commandTimeout;
+        StartupTimeout = startupTimeout;
+        ShutdownTimeout = shutdownTimeout;
+        OpenedAt = openedAt;
+        _lastClientActivityAt = openedAt;
+    }
+
+    public string SessionId { get; }
+
+    public string BackendName { get; }
+
+    public string PipeName { get; }
+
+    public string Nonce { get; }
+
+    public string? ClientIdentity { get; }
+
+    public string? ClientSessionName { get; }
+
+    public string? ClientCorrelationId { get; }
+
+    public TimeSpan CommandTimeout { get; }
+
+    public TimeSpan StartupTimeout { get; }
+
+    public TimeSpan ShutdownTimeout { get; }
+
+    public DateTimeOffset OpenedAt { get; }
+
+    public int? WorkerProcessId => _workerClient?.ProcessId;
+
+    public IWorkerClient? WorkerClient => _workerClient;
+
+    public SessionState State
+    {
+        get
+        {
+            lock (_syncRoot)
+            {
+                return _state;
+            }
+        }
+    }
+
+    public DateTimeOffset LastClientActivityAt
+    {
+        get
+        {
+            lock (_syncRoot)
+            {
+                return _lastClientActivityAt;
+            }
+        }
+    }
+
+    public DateTimeOffset? LeaseExpiresAt
+    {
+        get
+        {
+            lock (_syncRoot)
+            {
+                return _leaseExpiresAt;
+            }
+        }
+    }
+
+    public string? FinalFault
+    {
+        get
+        {
+            lock (_syncRoot)
+            {
+                return _finalFault;
+            }
+        }
+    }
+
+    public int ActiveEventSubscriberCount
+    {
+        get
+        {
+            lock (_syncRoot)
+            {
+                return _activeEventSubscriberCount;
+            }
+        }
+    }
+
+    public void AttachWorkerClient(IWorkerClient workerClient)
+    {
+        ArgumentNullException.ThrowIfNull(workerClient);
+
+        lock (_syncRoot)
+        {
+            _workerClient = workerClient;
+        }
+    }
+
+    public void TransitionTo(SessionState nextState)
+    {
+        lock (_syncRoot)
+        {
+            if (_state is SessionState.Closed)
+            {
+                return;
+            }
+
+            if (_state is SessionState.Faulted && nextState is not SessionState.Closed)
+            {
+                return;
+            }
+
+            _state = nextState;
+        }
+    }
+
+    public void MarkReady()
+    {
+        TransitionTo(SessionState.Ready);
+    }
+
+    public void MarkFaulted(string reason)
+    {
+        lock (_syncRoot)
+        {
+            if (_state is SessionState.Closed)
+            {
+                return;
+            }
+
+            _finalFault = reason;
+            _state = SessionState.Faulted;
+        }
+    }
+
+    public void TouchClientActivity(DateTimeOffset activityAt)
+    {
+        lock (_syncRoot)
+        {
+            _lastClientActivityAt = activityAt;
+        }
+    }
+
+    public void ExtendLease(DateTimeOffset leaseExpiresAt)
+    {
+        lock (_syncRoot)
+        {
+            _leaseExpiresAt = leaseExpiresAt;
+        }
+    }
+
+    public bool IsLeaseExpired(DateTimeOffset now)
+    {
+        lock (_syncRoot)
+        {
+            return _leaseExpiresAt is not null && _leaseExpiresAt <= now;
+        }
+    }
+
+    public IDisposable AttachEventSubscriber(bool allowMultipleSubscribers)
+    {
+        lock (_syncRoot)
+        {
+            if (_state != SessionState.Ready || _workerClient?.State != WorkerClientState.Ready)
+            {
+                throw new SessionManagerException(
+                    SessionManagerErrorCode.SessionNotReady,
+                    $"Session {SessionId} is not ready for event streaming. Current state is {_state}.");
+            }
+
+            if (!allowMultipleSubscribers && _activeEventSubscriberCount > 0)
+            {
+                throw new SessionManagerException(
+                    SessionManagerErrorCode.EventSubscriberAlreadyActive,
+                    $"Session {SessionId} already has an active event stream subscriber.");
+            }
+
+            _activeEventSubscriberCount++;
+            return new EventSubscriberLease(this);
+        }
+    }
+
+    public async Task<WorkerCommandReply> InvokeAsync(
+        WorkerCommand command,
+        CancellationToken cancellationToken)
+    {
+        IWorkerClient workerClient = GetReadyWorkerClient();
+        TouchClientActivity(DateTimeOffset.UtcNow);
+
+        return await workerClient.InvokeAsync(command, CommandTimeout, cancellationToken).ConfigureAwait(false);
+    }
+
+    public IAsyncEnumerable<WorkerEvent> ReadEventsAsync(CancellationToken cancellationToken)
+    {
+        IWorkerClient workerClient = GetReadyWorkerClient();
+        TouchClientActivity(DateTimeOffset.UtcNow);
+
+        return workerClient.ReadEventsAsync(cancellationToken);
+    }
+
+    public async Task<SessionCloseResult> CloseAsync(
+        string reason,
+        CancellationToken cancellationToken)
+    {
+        await _closeLock.WaitAsync(cancellationToken).ConfigureAwait(false);
+        try
+        {
+            if (_state is SessionState.Closed)
+            {
+                return new SessionCloseResult(SessionId, SessionState.Closed, AlreadyClosed: true);
+            }
+
+            bool alreadyClosing = _closeStarted;
+            _closeStarted = true;
+            _state = SessionState.Closing;
+
+            if (_workerClient is not null)
+            {
+                try
+                {
+                    await _workerClient.ShutdownAsync(ShutdownTimeout, cancellationToken).ConfigureAwait(false);
+                }
+                catch
+                {
+                    _workerClient.Kill(reason);
+                    throw;
+                }
+            }
+
+            _state = SessionState.Closed;
+            return new SessionCloseResult(SessionId, SessionState.Closed, alreadyClosing);
+        }
+        finally
+        {
+            _closeLock.Release();
+        }
+    }
+
+    public void KillWorker(string reason)
+    {
+        _workerClient?.Kill(reason);
+        TransitionTo(SessionState.Closed);
+    }
+
+    public async ValueTask DisposeAsync()
+    {
+        _closeLock.Dispose();
+        if (_workerClient is not null)
+        {
+            await _workerClient.DisposeAsync().ConfigureAwait(false);
+        }
+    }
+
+    private IWorkerClient GetReadyWorkerClient()
+    {
+        lock (_syncRoot)
+        {
+            if (_state != SessionState.Ready || _workerClient?.State != WorkerClientState.Ready)
+            {
+                throw new SessionManagerException(
+                    SessionManagerErrorCode.SessionNotReady,
+                    $"Session {SessionId} is not ready. Current state is {_state}.");
+            }
+
+            return _workerClient;
+        }
+    }
+
+    private void DetachEventSubscriber()
+    {
+        lock (_syncRoot)
+        {
+            if (_activeEventSubscriberCount > 0)
+            {
+                _activeEventSubscriberCount--;
+            }
+        }
+    }
+
+    private sealed class EventSubscriberLease(GatewaySession session) : IDisposable
+    {
+        private bool _disposed;
+
+        public void Dispose()
+        {
+            if (_disposed)
+            {
+                return;
+            }
+
+            session.DetachEventSubscriber();
+            _disposed = true;
+        }
+    }
+}
@@ -0,0 +1,34 @@
+using MxGateway.Contracts.Proto;
+
+namespace MxGateway.Server.Sessions;
+
+public interface ISessionManager
+{
+    Task<GatewaySession> OpenSessionAsync(
+        SessionOpenRequest request,
+        string? clientIdentity,
+        CancellationToken cancellationToken);
+
+    bool TryGetSession(
+        string sessionId,
+        out GatewaySession session);
+
+    Task<WorkerCommandReply> InvokeAsync(
+        string sessionId,
+        WorkerCommand command,
+        CancellationToken cancellationToken);
+
+    IAsyncEnumerable<WorkerEvent> ReadEventsAsync(
+        string sessionId,
+        CancellationToken cancellationToken);
+
+    Task<SessionCloseResult> CloseSessionAsync(
+        string sessionId,
+        CancellationToken cancellationToken);
+
+    Task<int> CloseExpiredLeasesAsync(
+        DateTimeOffset now,
+        CancellationToken cancellationToken);
+
+    Task ShutdownAsync(CancellationToken cancellationToken);
+}
@@ -0,0 +1,16 @@
+namespace MxGateway.Server.Sessions;
+
+public interface ISessionRegistry
+{
+    int Count { get; }
+
+    int ActiveCount { get; }
+
+    bool TryAdd(GatewaySession session);
+
+    bool TryGet(string sessionId, out GatewaySession session);
+
+    bool TryRemove(string sessionId, out GatewaySession session);
+
+    IReadOnlyCollection<GatewaySession> Snapshot();
+}
@@ -0,0 +1,8 @@
+namespace MxGateway.Server.Sessions;
+
+public interface ISessionWorkerClientFactory
+{
+    Task<MxGateway.Server.Workers.IWorkerClient> CreateAsync(
+        GatewaySession session,
+        CancellationToken cancellationToken);
+}
@@ -0,0 +1,8 @@
+using MxGateway.Contracts.Proto;
+
+namespace MxGateway.Server.Sessions;
+
+public sealed record SessionCloseResult(
+    string SessionId,
+    SessionState FinalState,
+    bool AlreadyClosed);
@@ -0,0 +1,287 @@
+using System.Security.Cryptography;
+using Google.Protobuf.WellKnownTypes;
+using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Logging.Abstractions;
+using Microsoft.Extensions.Options;
+using MxGateway.Contracts;
+using MxGateway.Contracts.Proto;
+using MxGateway.Server.Configuration;
+using MxGateway.Server.Metrics;
+using MxGateway.Server.Workers;
+
+namespace MxGateway.Server.Sessions;
+
+public sealed class SessionManager : ISessionManager
+{
+    public const string DefaultCloseReason = "client-close";
+    public const string GatewayShutdownReason = "gateway-shutdown";
+    public const string LeaseExpiredReason = "lease-expired";
+
+    private readonly ISessionRegistry _registry;
+    private readonly ISessionWorkerClientFactory _workerClientFactory;
+    private readonly GatewayMetrics _metrics;
+    private readonly TimeProvider _timeProvider;
+    private readonly ILogger<SessionManager> _logger;
+    private readonly GatewayOptions _options;
+
+    public SessionManager(
+        ISessionRegistry registry,
+        ISessionWorkerClientFactory workerClientFactory,
+        IOptions<GatewayOptions> options,
+        GatewayMetrics metrics,
+        TimeProvider? timeProvider = null,
+        ILogger<SessionManager>? logger = null)
+    {
+        _registry = registry ?? throw new ArgumentNullException(nameof(registry));
+        _workerClientFactory = workerClientFactory ?? throw new ArgumentNullException(nameof(workerClientFactory));
+        ArgumentNullException.ThrowIfNull(options);
+        _metrics = metrics ?? throw new ArgumentNullException(nameof(metrics));
+        _timeProvider = timeProvider ?? TimeProvider.System;
+        _logger = logger ?? NullLogger<SessionManager>.Instance;
+        _options = options.Value;
+    }
+
+    public async Task<GatewaySession> OpenSessionAsync(
+        SessionOpenRequest request,
+        string? clientIdentity,
+        CancellationToken cancellationToken)
+    {
+        ArgumentNullException.ThrowIfNull(request);
+        EnsureSessionCapacity();
+
+        GatewaySession session = CreateSession(request, clientIdentity);
+        if (!_registry.TryAdd(session))
+        {
+            throw new SessionManagerException(
+                SessionManagerErrorCode.OpenFailed,
+                $"Session id collision while opening session {session.SessionId}.");
+        }
+
+        try
+        {
+            session.TransitionTo(SessionState.StartingWorker);
+            IWorkerClient workerClient = await _workerClientFactory
+                .CreateAsync(session, cancellationToken)
+                .ConfigureAwait(false);
+
+            session.AttachWorkerClient(workerClient);
+            session.MarkReady();
+            _metrics.SessionOpened();
+
+            return session;
+        }
+        catch (Exception exception)
+        {
+            session.MarkFaulted(exception.Message);
+            _registry.TryRemove(session.SessionId, out _);
+            await session.DisposeAsync().ConfigureAwait(false);
+            _metrics.Fault(SessionManagerErrorCode.OpenFailed.ToString());
+            _logger.LogWarning(
+                exception,
+                "Failed to open gateway session {SessionId}.",
+                session.SessionId);
+
+            throw new SessionManagerException(
+                SessionManagerErrorCode.OpenFailed,
+                $"Failed to open session {session.SessionId}.",
+                exception);
+        }
+    }
+
+    public bool TryGetSession(
+        string sessionId,
+        out GatewaySession session)
+    {
+        return _registry.TryGet(sessionId, out session);
+    }
+
+    public async Task<WorkerCommandReply> InvokeAsync(
+        string sessionId,
+        WorkerCommand command,
+        CancellationToken cancellationToken)
+    {
+        GatewaySession session = GetRequiredSession(sessionId);
+
+        try
+        {
+            return await session.InvokeAsync(command, cancellationToken).ConfigureAwait(false);
+        }
+        catch (SessionManagerException)
+        {
+            throw;
+        }
+        catch (Exception exception)
+        {
+            if (session.WorkerClient?.State == WorkerClientState.Faulted)
+            {
+                session.MarkFaulted(exception.Message);
+            }
+
+            throw;
+        }
+    }
+
+    public IAsyncEnumerable<WorkerEvent> ReadEventsAsync(
+        string sessionId,
+        CancellationToken cancellationToken)
+    {
+        GatewaySession session = GetRequiredSession(sessionId);
+
+        return session.ReadEventsAsync(cancellationToken);
+    }
+
+    public async Task<SessionCloseResult> CloseSessionAsync(
+        string sessionId,
+        CancellationToken cancellationToken)
+    {
+        GatewaySession session = GetRequiredSession(sessionId);
+        SessionCloseResult result = await CloseSessionCoreAsync(
+            session,
+            DefaultCloseReason,
+            cancellationToken).ConfigureAwait(false);
+
+        return result;
+    }
+
+    public async Task<int> CloseExpiredLeasesAsync(
+        DateTimeOffset now,
+        CancellationToken cancellationToken)
+    {
+        int closedCount = 0;
+        foreach (GatewaySession session in _registry.Snapshot())
+        {
+            if (!session.IsLeaseExpired(now))
+            {
+                continue;
+            }
+
+            await CloseSessionCoreAsync(session, LeaseExpiredReason, cancellationToken).ConfigureAwait(false);
+            closedCount++;
+        }
+
+        return closedCount;
+    }
+
+    public async Task ShutdownAsync(CancellationToken cancellationToken)
+    {
+        foreach (GatewaySession session in _registry.Snapshot())
+        {
+            try
+            {
+                await CloseSessionCoreAsync(session, GatewayShutdownReason, cancellationToken).ConfigureAwait(false);
+            }
+            catch (Exception exception)
+            {
+                _logger.LogWarning(
+                    exception,
+                    "Graceful shutdown failed for session {SessionId}; killing worker.",
+                    session.SessionId);
+                session.KillWorker(GatewayShutdownReason);
+            }
+        }
+    }
+
+    private async Task<SessionCloseResult> CloseSessionCoreAsync(
+        GatewaySession session,
+        string reason,
+        CancellationToken cancellationToken)
+    {
+        bool wasClosed = session.State == SessionState.Closed;
+        try
+        {
+            SessionCloseResult result = await session.CloseAsync(reason, cancellationToken).ConfigureAwait(false);
+            if (!wasClosed && !result.AlreadyClosed)
+            {
+                _metrics.SessionClosed();
+            }
+
+            return result;
+        }
+        catch (Exception exception)
+        {
+            session.MarkFaulted(exception.Message);
+            _metrics.Fault(SessionManagerErrorCode.CloseFailed.ToString());
+            throw new SessionManagerException(
+                SessionManagerErrorCode.CloseFailed,
+                $"Failed to close session {session.SessionId}.",
+                exception);
+        }
+    }
+
+    private GatewaySession GetRequiredSession(string sessionId)
+    {
+        if (!_registry.TryGet(sessionId, out GatewaySession session))
+        {
+            throw new SessionManagerException(
+                SessionManagerErrorCode.SessionNotFound,
+                $"Session {sessionId} was not found.");
+        }
+
+        return session;
+    }
+
+    private void EnsureSessionCapacity()
+    {
+        if (_registry.ActiveCount >= _options.Sessions.MaxSessions)
+        {
+            throw new SessionManagerException(
+                SessionManagerErrorCode.SessionLimitExceeded,
+                $"Gateway session limit {_options.Sessions.MaxSessions} has been reached.");
+        }
+    }
+
+    private GatewaySession CreateSession(
+        SessionOpenRequest request,
+        string? clientIdentity)
+    {
+        string sessionId = CreateSessionId();
+        string backendName = string.IsNullOrWhiteSpace(request.RequestedBackend)
+            ? GatewayContractInfo.DefaultBackendName
+            : request.RequestedBackend!;
+        TimeSpan commandTimeout = ResolveCommandTimeout(request.CommandTimeout);
+        TimeSpan startupTimeout = TimeSpan.FromSeconds(_options.Worker.StartupTimeoutSeconds);
+        TimeSpan shutdownTimeout = TimeSpan.FromSeconds(_options.Worker.ShutdownTimeoutSeconds);
+        string pipeName = $"mxaccess-gateway-{Environment.ProcessId}-{sessionId}";
+        string nonce = CreateNonce();
+        DateTimeOffset openedAt = _timeProvider.GetUtcNow();
+
+        return new GatewaySession(
+            sessionId,
+            backendName,
+            pipeName,
+            nonce,
+            clientIdentity,
+            request.ClientSessionName,
+            request.ClientCorrelationId,
+            commandTimeout,
+            startupTimeout,
+            shutdownTimeout,
+            openedAt);
+    }
+
+    private TimeSpan ResolveCommandTimeout(Duration? requestedTimeout)
+    {
+        if (requestedTimeout is null)
+        {
+            return TimeSpan.FromSeconds(_options.Sessions.DefaultCommandTimeoutSeconds);
+        }
+
+        TimeSpan timeout = requestedTimeout.ToTimeSpan();
+        return timeout <= TimeSpan.Zero
+            ? TimeSpan.FromSeconds(_options.Sessions.DefaultCommandTimeoutSeconds)
+            : timeout;
+    }
+
+    private static string CreateSessionId()
+    {
+        return $"session-{Guid.NewGuid():N}";
+    }
+
+    private static string CreateNonce()
+    {
+        Span<byte> bytes = stackalloc byte[32];
+        RandomNumberGenerator.Fill(bytes);
+
+        return Convert.ToBase64String(bytes);
+    }
+}
@@ -0,0 +1,12 @@
+namespace MxGateway.Server.Sessions;
+
+public enum SessionManagerErrorCode
+{
+    SessionNotFound,
+    SessionNotReady,
+    EventSubscriberAlreadyActive,
+    EventQueueOverflow,
+    SessionLimitExceeded,
+    OpenFailed,
+    CloseFailed,
+}
@@ -0,0 +1,23 @@
+namespace MxGateway.Server.Sessions;
+
+public sealed class SessionManagerException : Exception
+{
+    public SessionManagerException(
+        SessionManagerErrorCode errorCode,
+        string message)
+        : base(message)
+    {
+        ErrorCode = errorCode;
+    }
+
+    public SessionManagerException(
+        SessionManagerErrorCode errorCode,
+        string message,
+        Exception innerException)
+        : base(message, innerException)
+    {
+        ErrorCode = errorCode;
+    }
+
+    public SessionManagerErrorCode ErrorCode { get; }
+}
@@ -0,0 +1,22 @@
+using Google.Protobuf.WellKnownTypes;
+using MxGateway.Contracts.Proto;
+
+namespace MxGateway.Server.Sessions;
+
+public sealed record SessionOpenRequest(
+    string? RequestedBackend,
+    string? ClientSessionName,
+    string? ClientCorrelationId,
+    Duration? CommandTimeout)
+{
+    public static SessionOpenRequest FromContract(OpenSessionRequest request)
+    {
+        ArgumentNullException.ThrowIfNull(request);
+
+        return new SessionOpenRequest(
+            request.RequestedBackend,
+            request.ClientSessionName,
+            request.ClientCorrelationId,
+            request.CommandTimeout);
+    }
+}
@@ -0,0 +1,39 @@
+using System.Collections.Concurrent;
+using MxGateway.Contracts.Proto;
+
+namespace MxGateway.Server.Sessions;
+
+public sealed class SessionRegistry : ISessionRegistry
+{
+    private readonly ConcurrentDictionary<string, GatewaySession> _sessions = new(StringComparer.Ordinal);
+
+    public int Count => _sessions.Count;
+
+    public int ActiveCount => _sessions.Values.Count(session => session.State is not SessionState.Closed);
+
+    public bool TryAdd(GatewaySession session)
+    {
+        ArgumentNullException.ThrowIfNull(session);
+
+        return _sessions.TryAdd(session.SessionId, session);
+    }
+
+    public bool TryGet(
+        string sessionId,
+        out GatewaySession session)
+    {
+        return _sessions.TryGetValue(sessionId, out session!);
+    }
+
+    public bool TryRemove(
+        string sessionId,
+        out GatewaySession session)
+    {
+        return _sessions.TryRemove(sessionId, out session!);
+    }
+
+    public IReadOnlyCollection<GatewaySession> Snapshot()
+    {
+        return _sessions.Values.ToArray();
+    }
+}
@@ -0,0 +1,13 @@
+namespace MxGateway.Server.Sessions;
+
+public static class SessionServiceCollectionExtensions
+{
+    public static IServiceCollection AddGatewaySessions(this IServiceCollection services)
+    {
+        services.AddSingleton<ISessionRegistry, SessionRegistry>();
+        services.AddSingleton<ISessionWorkerClientFactory, SessionWorkerClientFactory>();
+        services.AddSingleton<ISessionManager, SessionManager>();
+
+        return services;
+    }
+}
@@ -0,0 +1,144 @@
+using System.IO.Pipes;
+using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Options;
+using MxGateway.Contracts;
+using MxGateway.Contracts.Proto;
+using MxGateway.Server.Configuration;
+using MxGateway.Server.Metrics;
+using MxGateway.Server.Workers;
+
+namespace MxGateway.Server.Sessions;
+
+public sealed class SessionWorkerClientFactory : ISessionWorkerClientFactory
+{
+    private readonly IWorkerProcessLauncher _workerProcessLauncher;
+    private readonly GatewayMetrics _metrics;
+    private readonly TimeProvider _timeProvider;
+    private readonly ILoggerFactory _loggerFactory;
+    private readonly GatewayOptions _options;
+
+    public SessionWorkerClientFactory(
+        IWorkerProcessLauncher workerProcessLauncher,
+        IOptions<GatewayOptions> options,
+        GatewayMetrics metrics,
+        ILoggerFactory loggerFactory,
+        TimeProvider? timeProvider = null)
+    {
+        _workerProcessLauncher = workerProcessLauncher ?? throw new ArgumentNullException(nameof(workerProcessLauncher));
+        ArgumentNullException.ThrowIfNull(options);
+        _metrics = metrics ?? throw new ArgumentNullException(nameof(metrics));
+        _loggerFactory = loggerFactory ?? throw new ArgumentNullException(nameof(loggerFactory));
+        _timeProvider = timeProvider ?? TimeProvider.System;
+        _options = options.Value;
+    }
+
+    public async Task<IWorkerClient> CreateAsync(
+        GatewaySession session,
+        CancellationToken cancellationToken)
+    {
+        ArgumentNullException.ThrowIfNull(session);
+
+        NamedPipeServerStream? pipe = CreatePipe(session.PipeName);
+        WorkerProcessHandle? processHandle = null;
+        IWorkerClient? workerClient = null;
+        try
+        {
+            session.TransitionTo(SessionState.StartingWorker);
+            processHandle = await _workerProcessLauncher
+                .LaunchAsync(
+                    new WorkerProcessLaunchRequest(
+                        session.SessionId,
+                        session.PipeName,
+                        GatewayContractInfo.WorkerProtocolVersion,
+                        session.Nonce,
+                        pipe),
+                    cancellationToken)
+                .ConfigureAwait(false);
+
+            session.TransitionTo(SessionState.WaitingForPipe);
+            await WaitForPipeConnectionAsync(pipe, session.StartupTimeout, cancellationToken).ConfigureAwait(false);
+
+            session.TransitionTo(SessionState.Handshaking);
+            WorkerFrameProtocolOptions frameOptions = new(
+                session.SessionId,
+                GatewayContractInfo.WorkerProtocolVersion,
+                _options.Worker.MaxMessageBytes);
+            WorkerClientConnection connection = new(
+                session.SessionId,
+                session.Nonce,
+                pipe,
+                frameOptions,
+                processHandle);
+            WorkerClientOptions clientOptions = new()
+            {
+                HeartbeatGrace = TimeSpan.FromSeconds(_options.Worker.HeartbeatGraceSeconds),
+                HeartbeatCheckInterval = TimeSpan.FromSeconds(_options.Worker.HeartbeatIntervalSeconds),
+                EventChannelCapacity = _options.Events.QueueCapacity,
+            };
+
+            workerClient = new WorkerClient(
+                connection,
+                clientOptions,
+                _metrics,
+                _timeProvider,
+                _loggerFactory.CreateLogger<WorkerClient>());
+
+            pipe = null;
+            processHandle = null;
+
+            session.TransitionTo(SessionState.InitializingWorker);
+            await workerClient.StartAsync(cancellationToken).ConfigureAwait(false);
+
+            return workerClient;
+        }
+        catch
+        {
+            if (workerClient is not null)
+            {
+                await workerClient.DisposeAsync().ConfigureAwait(false);
+            }
+            else
+            {
+                if (processHandle is not null)
+                {
+                    try
+                    {
+                        if (!processHandle.Process.HasExited)
+                        {
+                            processHandle.Process.Kill(entireProcessTree: true);
+                            _metrics.WorkerKilled("OpenSessionFailed");
+                        }
+                    }
+                    finally
+                    {
+                        processHandle.Dispose();
+                    }
+                }
+
+                pipe?.Dispose();
+            }
+
+            throw;
+        }
+    }
+
+    private static NamedPipeServerStream CreatePipe(string pipeName)
+    {
+        return new NamedPipeServerStream(
+            pipeName,
+            PipeDirection.InOut,
+            maxNumberOfServerInstances: 1,
+            PipeTransmissionMode.Byte,
+            PipeOptions.Asynchronous);
+    }
+
+    private static async Task WaitForPipeConnectionAsync(
+        NamedPipeServerStream pipe,
+        TimeSpan startupTimeout,
+        CancellationToken cancellationToken)
+    {
+        using CancellationTokenSource timeout = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken);
+        timeout.CancelAfter(startupTimeout);
+        await pipe.WaitForConnectionAsync(timeout.Token).ConfigureAwait(false);
+    }
+}
@@ -0,0 +1,27 @@
+using MxGateway.Contracts.Proto;
+
+namespace MxGateway.Server.Workers;
+
+public interface IWorkerClient : IAsyncDisposable
+{
+    string SessionId { get; }
+
+    int? ProcessId { get; }
+
+    WorkerClientState State { get; }
+
+    DateTimeOffset LastHeartbeatAt { get; }
+
+    Task StartAsync(CancellationToken cancellationToken);
+
+    Task<WorkerCommandReply> InvokeAsync(
+        WorkerCommand command,
+        TimeSpan timeout,
+        CancellationToken cancellationToken);
+
+    IAsyncEnumerable<WorkerEvent> ReadEventsAsync(CancellationToken cancellationToken);
+
+    Task ShutdownAsync(TimeSpan timeout, CancellationToken cancellationToken);
+
+    void Kill(string reason);
+}
@@ -0,0 +1,757 @@
+using System.Collections.Concurrent;
+using System.Runtime.CompilerServices;
+using System.Threading.Channels;
+using Google.Protobuf.WellKnownTypes;
+using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Logging.Abstractions;
+using MxGateway.Contracts;
+using MxGateway.Contracts.Proto;
+using MxGateway.Server.Metrics;
+
+namespace MxGateway.Server.Workers;
+
+public sealed class WorkerClient : IWorkerClient
+{
+    private const string GatewayVersionFallback = "unknown";
+    private readonly object _syncRoot = new();
+    private readonly WorkerClientConnection _connection;
+    private readonly WorkerClientOptions _options;
+    private readonly GatewayMetrics? _metrics;
+    private readonly TimeProvider _timeProvider;
+    private readonly ILogger<WorkerClient> _logger;
+    private readonly WorkerFrameReader _reader;
+    private readonly WorkerFrameWriter _writer;
+    private readonly Channel<WorkerEnvelope> _outboundEnvelopes;
+    private readonly Channel<WorkerEvent> _events;
+    private readonly ConcurrentDictionary<string, PendingCommand> _pendingCommands = new(StringComparer.Ordinal);
+    private readonly CancellationTokenSource _stopCts = new();
+    private long _nextSequence;
+    private WorkerClientState _state;
+    private DateTimeOffset _lastHeartbeatAt;
+    private int? _processId;
+    private int _eventQueueDepth;
+    private Task? _readLoopTask;
+    private Task? _writeLoopTask;
+    private Task? _heartbeatLoopTask;
+    private bool _disposed;
+
+    public WorkerClient(
+        WorkerClientConnection connection,
+        WorkerClientOptions? options = null,
+        GatewayMetrics? metrics = null,
+        TimeProvider? timeProvider = null,
+        ILogger<WorkerClient>? logger = null)
+    {
+        _connection = connection ?? throw new ArgumentNullException(nameof(connection));
+        _options = options ?? new WorkerClientOptions();
+        _metrics = metrics;
+        _timeProvider = timeProvider ?? TimeProvider.System;
+        _logger = logger ?? NullLogger<WorkerClient>.Instance;
+        _reader = new WorkerFrameReader(connection.Stream, connection.FrameOptions);
+        _writer = new WorkerFrameWriter(connection.Stream, connection.FrameOptions);
+        _outboundEnvelopes = Channel.CreateUnbounded<WorkerEnvelope>(
+            new UnboundedChannelOptions
+            {
+                SingleReader = true,
+                SingleWriter = false,
+                AllowSynchronousContinuations = false,
+            });
+        _events = Channel.CreateBounded<WorkerEvent>(
+            new BoundedChannelOptions(_options.EventChannelCapacity)
+            {
+                SingleReader = false,
+                SingleWriter = true,
+                FullMode = BoundedChannelFullMode.Wait,
+                AllowSynchronousContinuations = false,
+            });
+        _lastHeartbeatAt = _timeProvider.GetUtcNow();
+    }
+
+    public string SessionId => _connection.SessionId;
+
+    public int? ProcessId
+    {
+        get
+        {
+            lock (_syncRoot)
+            {
+                return _processId;
+            }
+        }
+    }
+
+    public WorkerClientState State
+    {
+        get
+        {
+            lock (_syncRoot)
+            {
+                return _state;
+            }
+        }
+    }
+
+    public DateTimeOffset LastHeartbeatAt
+    {
+        get
+        {
+            lock (_syncRoot)
+            {
+                return _lastHeartbeatAt;
+            }
+        }
+    }
+
+    public async Task StartAsync(CancellationToken cancellationToken)
+    {
+        ThrowIfDisposed();
+        TransitionFromCreatedToHandshaking();
+
+        _writeLoopTask = Task.Run(WriteLoopAsync);
+        await EnqueueAsync(CreateGatewayHelloEnvelope(), cancellationToken).ConfigureAwait(false);
+
+        WorkerEnvelope helloEnvelope = await ReadHandshakeEnvelopeAsync(
+            WorkerEnvelope.BodyOneofCase.WorkerHello,
+            cancellationToken).ConfigureAwait(false);
+        ValidateWorkerHello(helloEnvelope.WorkerHello);
+
+        WorkerEnvelope readyEnvelope = await ReadHandshakeEnvelopeAsync(
+            WorkerEnvelope.BodyOneofCase.WorkerReady,
+            cancellationToken).ConfigureAwait(false);
+        MarkReady(readyEnvelope.WorkerReady);
+
+        _readLoopTask = Task.Run(ReadLoopAsync);
+        _heartbeatLoopTask = Task.Run(HeartbeatLoopAsync);
+    }
+
+    public async Task<WorkerCommandReply> InvokeAsync(
+        WorkerCommand command,
+        TimeSpan timeout,
+        CancellationToken cancellationToken)
+    {
+        ArgumentNullException.ThrowIfNull(command);
+        ThrowIfDisposed();
+        EnsureReady();
+
+        if (timeout <= TimeSpan.Zero)
+        {
+            throw new ArgumentOutOfRangeException(nameof(timeout), timeout, "Command timeout must be greater than zero.");
+        }
+
+        string correlationId = Guid.NewGuid().ToString("N");
+        string method = GetCommandMethod(command);
+        PendingCommand pendingCommand = new(
+            correlationId,
+            method,
+            _timeProvider.GetTimestamp());
+
+        if (!_pendingCommands.TryAdd(correlationId, pendingCommand))
+        {
+            throw new InvalidOperationException("Generated a duplicate command correlation id.");
+        }
+
+        _metrics?.CommandStarted(method);
+
+        try
+        {
+            await EnqueueAsync(CreateCommandEnvelope(correlationId, command), cancellationToken).ConfigureAwait(false);
+            using CancellationTokenSource timeoutCts = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken);
+            Task timeoutTask = Task.Delay(timeout, timeoutCts.Token);
+            Task<WorkerCommandReply> replyTask = pendingCommand.Task;
+            Task completedTask = await Task.WhenAny(replyTask, timeoutTask).ConfigureAwait(false);
+
+            if (completedTask == replyTask)
+            {
+                await timeoutCts.CancelAsync().ConfigureAwait(false);
+                return await replyTask.ConfigureAwait(false);
+            }
+
+            if (cancellationToken.IsCancellationRequested)
+            {
+                RemovePendingCommandAsFailed(
+                    correlationId,
+                    pendingCommand,
+                    WorkerClientErrorCode.GatewayShutdown,
+                    "Command wait was canceled.");
+                cancellationToken.ThrowIfCancellationRequested();
+            }
+
+            RemovePendingCommandAsFailed(
+                correlationId,
+                pendingCommand,
+                WorkerClientErrorCode.CommandTimeout,
+                $"Worker command {method} timed out after {timeout}.");
+
+            throw new WorkerClientException(
+                WorkerClientErrorCode.CommandTimeout,
+                $"Worker command {method} timed out after {timeout}.");
+        }
+        catch
+        {
+            _pendingCommands.TryRemove(correlationId, out _);
+            throw;
+        }
+    }
+
+    public async IAsyncEnumerable<WorkerEvent> ReadEventsAsync(
+        [EnumeratorCancellation] CancellationToken cancellationToken)
+    {
+        await foreach (WorkerEvent workerEvent in _events.Reader.ReadAllAsync(cancellationToken).ConfigureAwait(false))
+        {
+            int queueDepth = Math.Max(0, Interlocked.Decrement(ref _eventQueueDepth));
+            _metrics?.SetEventQueueDepth(queueDepth);
+            yield return workerEvent;
+        }
+    }
+
+    public async Task ShutdownAsync(TimeSpan timeout, CancellationToken cancellationToken)
+    {
+        ThrowIfDisposed();
+        if (timeout <= TimeSpan.Zero)
+        {
+            throw new ArgumentOutOfRangeException(nameof(timeout), timeout, "Shutdown timeout must be greater than zero.");
+        }
+
+        WorkerClientState state = State;
+        if (state is WorkerClientState.Closed or WorkerClientState.Faulted)
+        {
+            return;
+        }
+
+        MarkClosing();
+        await EnqueueAsync(CreateShutdownEnvelope(timeout, "gateway-shutdown"), cancellationToken).ConfigureAwait(false);
+        _outboundEnvelopes.Writer.TryComplete();
+
+        using CancellationTokenSource timeoutCts = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken);
+        timeoutCts.CancelAfter(timeout);
+        try
+        {
+            await WaitForBackgroundTasksAsync(timeoutCts.Token).ConfigureAwait(false);
+            MarkClosed("shutdown");
+        }
+        catch (OperationCanceledException) when (!cancellationToken.IsCancellationRequested)
+        {
+            SetFaulted(
+                WorkerClientErrorCode.ShutdownTimeout,
+                "Worker shutdown timed out.",
+                null);
+            throw new WorkerClientException(
+                WorkerClientErrorCode.ShutdownTimeout,
+                $"Worker shutdown timed out after {timeout}.");
+        }
+    }
+
+    public void Kill(string reason)
+    {
+        ThrowIfDisposed();
+        _connection.ProcessHandle?.Process.Kill(entireProcessTree: true);
+        _metrics?.WorkerKilled(reason);
+        SetFaulted(
+            WorkerClientErrorCode.WorkerFaulted,
+            $"Worker was killed by the gateway: {reason}.",
+            null);
+    }
+
+    public async ValueTask DisposeAsync()
+    {
+        if (_disposed)
+        {
+            return;
+        }
+
+        _disposed = true;
+        _stopCts.Cancel();
+        _outboundEnvelopes.Writer.TryComplete();
+        _events.Writer.TryComplete();
+        CompletePendingCommands(
+            new WorkerClientException(
+                WorkerClientErrorCode.GatewayShutdown,
+                "Worker client was disposed."));
+
+        await WaitForBackgroundTasksAsync(CancellationToken.None).ConfigureAwait(false);
+        await _connection.Stream.DisposeAsync().ConfigureAwait(false);
+        _connection.ProcessHandle?.Dispose();
+        _stopCts.Dispose();
+    }
+
+    private async Task WriteLoopAsync()
+    {
+        try
+        {
+            await foreach (WorkerEnvelope envelope in _outboundEnvelopes.Reader.ReadAllAsync(_stopCts.Token).ConfigureAwait(false))
+            {
+                await _writer.WriteAsync(envelope, _stopCts.Token).ConfigureAwait(false);
+            }
+        }
+        catch (OperationCanceledException) when (_stopCts.IsCancellationRequested || IsTerminalState())
+        {
+        }
+        catch (Exception exception)
+        {
+            SetFaulted(
+                WorkerClientErrorCode.WriteFailed,
+                "Worker pipe write failed.",
+                exception);
+        }
+    }
+
+    private async Task ReadLoopAsync()
+    {
+        try
+        {
+            while (!_stopCts.IsCancellationRequested)
+            {
+                WorkerEnvelope envelope = await _reader.ReadAsync(_stopCts.Token).ConfigureAwait(false);
+                await DispatchEnvelopeAsync(envelope, _stopCts.Token).ConfigureAwait(false);
+            }
+        }
+        catch (OperationCanceledException) when (_stopCts.IsCancellationRequested || IsTerminalState())
+        {
+        }
+        catch (WorkerFrameProtocolException exception) when (exception.ErrorCode == WorkerFrameProtocolErrorCode.EndOfStream)
+        {
+            SetFaulted(
+                WorkerClientErrorCode.PipeDisconnected,
+                "Worker pipe disconnected.",
+                exception);
+        }
+        catch (Exception exception)
+        {
+            SetFaulted(
+                WorkerClientErrorCode.ProtocolViolation,
+                "Worker read loop failed.",
+                exception);
+        }
+    }
+
+    private async Task HeartbeatLoopAsync()
+    {
+        try
+        {
+            while (!_stopCts.IsCancellationRequested)
+            {
+                await Task.Delay(_options.HeartbeatCheckInterval, _stopCts.Token).ConfigureAwait(false);
+                if (State != WorkerClientState.Ready)
+                {
+                    continue;
+                }
+
+                DateTimeOffset lastHeartbeatAt = LastHeartbeatAt;
+                DateTimeOffset now = _timeProvider.GetUtcNow();
+                if (now - lastHeartbeatAt <= _options.HeartbeatGrace)
+                {
+                    continue;
+                }
+
+                _metrics?.HeartbeatFailed(SessionId);
+                SetFaulted(
+                    WorkerClientErrorCode.HeartbeatExpired,
+                    $"Worker heartbeat expired. Last heartbeat was at {lastHeartbeatAt:O}.",
+                    null);
+            }
+        }
+        catch (OperationCanceledException) when (_stopCts.IsCancellationRequested || IsTerminalState())
+        {
+        }
+    }
+
+    private async Task DispatchEnvelopeAsync(
+        WorkerEnvelope envelope,
+        CancellationToken cancellationToken)
+    {
+        switch (envelope.BodyCase)
+        {
+            case WorkerEnvelope.BodyOneofCase.WorkerCommandReply:
+                CompleteCommand(envelope);
+                break;
+            case WorkerEnvelope.BodyOneofCase.WorkerEvent:
+                await EnqueueWorkerEventAsync(envelope.WorkerEvent, cancellationToken).ConfigureAwait(false);
+                break;
+            case WorkerEnvelope.BodyOneofCase.WorkerHeartbeat:
+                MarkHeartbeat(envelope.WorkerHeartbeat);
+                break;
+            case WorkerEnvelope.BodyOneofCase.WorkerFault:
+                SetFaulted(
+                    WorkerClientErrorCode.WorkerFaulted,
+                    CreateWorkerFaultMessage(envelope.WorkerFault),
+                    null);
+                break;
+            case WorkerEnvelope.BodyOneofCase.WorkerShutdownAck:
+                MarkClosed("worker-shutdown-ack");
+                break;
+            default:
+                SetFaulted(
+                    WorkerClientErrorCode.ProtocolViolation,
+                    $"Worker sent unexpected envelope body {envelope.BodyCase}.",
+                    null);
+                break;
+        }
+    }
+
+    private async Task EnqueueWorkerEventAsync(
+        WorkerEvent workerEvent,
+        CancellationToken cancellationToken)
+    {
+        if (workerEvent.Event is not null)
+        {
+            _metrics?.EventReceived(SessionId, workerEvent.Event.Family.ToString());
+        }
+
+        if (!_events.Writer.TryWrite(workerEvent))
+        {
+            _metrics?.QueueOverflow("worker-events");
+            SetFaulted(
+                WorkerClientErrorCode.ProtocolViolation,
+                "Worker event channel rejected an event.",
+                null);
+            return;
+        }
+
+        int queueDepth = Interlocked.Increment(ref _eventQueueDepth);
+        _metrics?.SetEventQueueDepth(queueDepth);
+    }
+
+    private void CompleteCommand(WorkerEnvelope envelope)
+    {
+        string correlationId = envelope.CorrelationId;
+        if (string.IsNullOrWhiteSpace(correlationId))
+        {
+            correlationId = envelope.WorkerCommandReply.Reply?.CorrelationId ?? string.Empty;
+        }
+
+        if (!_pendingCommands.TryRemove(correlationId, out PendingCommand? pendingCommand))
+        {
+            _logger.LogDebug(
+                "Ignoring late or unknown worker command reply for session {SessionId} and correlation {CorrelationId}.",
+                SessionId,
+                correlationId);
+            return;
+        }
+
+        TimeSpan duration = _timeProvider.GetElapsedTime(pendingCommand.StartTimestamp);
+        _metrics?.CommandSucceeded(pendingCommand.Method, duration);
+        pendingCommand.SetResult(envelope.WorkerCommandReply);
+    }
+
+    private void RemovePendingCommandAsFailed(
+        string correlationId,
+        PendingCommand pendingCommand,
+        WorkerClientErrorCode errorCode,
+        string message)
+    {
+        if (!_pendingCommands.TryRemove(correlationId, out _))
+        {
+            return;
+        }
+
+        TimeSpan duration = _timeProvider.GetElapsedTime(pendingCommand.StartTimestamp);
+        _metrics?.CommandFailed(pendingCommand.Method, errorCode.ToString(), duration);
+        pendingCommand.SetException(new WorkerClientException(errorCode, message));
+    }
+
+    private async Task<WorkerEnvelope> ReadHandshakeEnvelopeAsync(
+        WorkerEnvelope.BodyOneofCase expectedBody,
+        CancellationToken cancellationToken)
+    {
+        WorkerEnvelope envelope = await _reader.ReadAsync(cancellationToken).ConfigureAwait(false);
+        if (envelope.BodyCase != expectedBody)
+        {
+            throw new WorkerClientException(
+                WorkerClientErrorCode.ProtocolViolation,
+                $"Worker handshake expected {expectedBody} but received {envelope.BodyCase}.");
+        }
+
+        return envelope;
+    }
+
+    private void ValidateWorkerHello(WorkerHello workerHello)
+    {
+        if (workerHello.ProtocolVersion != _connection.FrameOptions.ProtocolVersion)
+        {
+            throw new WorkerClientException(
+                WorkerClientErrorCode.ProtocolViolation,
+                "Worker hello protocol version does not match the gateway protocol version.");
+        }
+
+        if (!string.Equals(workerHello.Nonce, _connection.Nonce, StringComparison.Ordinal))
+        {
+            throw new WorkerClientException(
+                WorkerClientErrorCode.ProtocolViolation,
+                "Worker hello nonce does not match the gateway nonce.");
+        }
+
+        lock (_syncRoot)
+        {
+            _processId = workerHello.WorkerProcessId == 0
+                ? _connection.ProcessHandle?.ProcessId
+                : workerHello.WorkerProcessId;
+        }
+    }
+
+    private void MarkReady(WorkerReady ready)
+    {
+        lock (_syncRoot)
+        {
+            _processId = ready.WorkerProcessId == 0
+                ? _processId ?? _connection.ProcessHandle?.ProcessId
+                : ready.WorkerProcessId;
+            _lastHeartbeatAt = _timeProvider.GetUtcNow();
+            _state = WorkerClientState.Ready;
+        }
+
+        DateTimeOffset readyAt = _timeProvider.GetUtcNow();
+        DateTimeOffset launchedAt = _connection.ProcessHandle?.LaunchedAt ?? readyAt;
+        _metrics?.WorkerStarted(readyAt - launchedAt);
+    }
+
+    private void MarkHeartbeat(WorkerHeartbeat heartbeat)
+    {
+        lock (_syncRoot)
+        {
+            _lastHeartbeatAt = _timeProvider.GetUtcNow();
+            if (heartbeat.WorkerProcessId != 0)
+            {
+                _processId = heartbeat.WorkerProcessId;
+            }
+        }
+    }
+
+    private void MarkClosing()
+    {
+        lock (_syncRoot)
+        {
+            if (_state is WorkerClientState.Closed or WorkerClientState.Faulted)
+            {
+                return;
+            }
+
+            _state = WorkerClientState.Closing;
+        }
+    }
+
+    private void MarkClosed(string reason)
+    {
+        lock (_syncRoot)
+        {
+            if (_state == WorkerClientState.Closed)
+            {
+                return;
+            }
+
+            _state = WorkerClientState.Closed;
+        }
+
+        _stopCts.Cancel();
+        _outboundEnvelopes.Writer.TryComplete();
+        _events.Writer.TryComplete();
+        CompletePendingCommands(
+            new WorkerClientException(
+                WorkerClientErrorCode.GatewayShutdown,
+                $"Worker client closed because {reason}."));
+        _metrics?.WorkerStopped(reason);
+    }
+
+    private void SetFaulted(
+        WorkerClientErrorCode errorCode,
+        string message,
+        Exception? exception)
+    {
+        WorkerClientException fault = exception is null
+            ? new WorkerClientException(errorCode, message)
+            : new WorkerClientException(errorCode, message, exception);
+
+        lock (_syncRoot)
+        {
+            if (_state is WorkerClientState.Faulted or WorkerClientState.Closed)
+            {
+                return;
+            }
+
+            _state = WorkerClientState.Faulted;
+        }
+
+        _stopCts.Cancel();
+        _outboundEnvelopes.Writer.TryComplete(fault);
+        _events.Writer.TryComplete(fault);
+        CompletePendingCommands(fault);
+        _metrics?.Fault(errorCode.ToString());
+        _logger.LogWarning(exception, "Worker client faulted for session {SessionId}: {Message}", SessionId, message);
+    }
+
+    private void CompletePendingCommands(Exception exception)
+    {
+        foreach (KeyValuePair<string, PendingCommand> item in _pendingCommands.ToArray())
+        {
+            if (_pendingCommands.TryRemove(item.Key, out PendingCommand? pendingCommand))
+            {
+                TimeSpan duration = _timeProvider.GetElapsedTime(pendingCommand.StartTimestamp);
+                _metrics?.CommandFailed(pendingCommand.Method, exception.GetType().Name, duration);
+                pendingCommand.SetException(exception);
+            }
+        }
+    }
+
+    private void TransitionFromCreatedToHandshaking()
+    {
+        lock (_syncRoot)
+        {
+            if (_state != WorkerClientState.Created)
+            {
+                throw new WorkerClientException(
+                    WorkerClientErrorCode.InvalidState,
+                    $"Worker client cannot start from state {_state}.");
+            }
+
+            _state = WorkerClientState.Handshaking;
+        }
+    }
+
+    private void EnsureReady()
+    {
+        WorkerClientState state = State;
+        if (state != WorkerClientState.Ready)
+        {
+            throw new WorkerClientException(
+                WorkerClientErrorCode.InvalidState,
+                $"Worker client is not ready. Current state is {state}.");
+        }
+    }
+
+    private bool IsTerminalState()
+    {
+        WorkerClientState state = State;
+        return state is WorkerClientState.Closing or WorkerClientState.Closed or WorkerClientState.Faulted;
+    }
+
+    private async Task EnqueueAsync(
+        WorkerEnvelope envelope,
+        CancellationToken cancellationToken)
+    {
+        try
+        {
+            await _outboundEnvelopes.Writer.WriteAsync(envelope, cancellationToken).ConfigureAwait(false);
+        }
+        catch (ChannelClosedException exception)
+        {
+            throw new WorkerClientException(
+                WorkerClientErrorCode.WriteFailed,
+                "Worker outbound channel is closed.",
+                exception);
+        }
+    }
+
+    private WorkerEnvelope CreateGatewayHelloEnvelope()
+    {
+        return CreateEnvelope(
+            correlationId: string.Empty,
+            envelope => envelope.GatewayHello = new GatewayHello
+            {
+                SupportedProtocolVersion = _connection.FrameOptions.ProtocolVersion,
+                Nonce = _connection.Nonce,
+                GatewayVersion = typeof(GatewayContractInfo).Assembly.GetName().Version?.ToString() ?? GatewayVersionFallback,
+            });
+    }
+
+    private WorkerEnvelope CreateCommandEnvelope(
+        string correlationId,
+        WorkerCommand command)
+    {
+        return CreateEnvelope(
+            correlationId,
+            envelope => envelope.WorkerCommand = command.Clone());
+    }
+
+    private WorkerEnvelope CreateShutdownEnvelope(
+        TimeSpan timeout,
+        string reason)
+    {
+        return CreateEnvelope(
+            correlationId: string.Empty,
+            envelope => envelope.WorkerShutdown = new WorkerShutdown
+            {
+                GracePeriod = Duration.FromTimeSpan(timeout),
+                Reason = reason,
+            });
+    }
+
+    private WorkerEnvelope CreateEnvelope(
+        string correlationId,
+        Action<WorkerEnvelope> setBody)
+    {
+        WorkerEnvelope envelope = new()
+        {
+            ProtocolVersion = _connection.FrameOptions.ProtocolVersion,
+            SessionId = SessionId,
+            Sequence = (ulong)Interlocked.Increment(ref _nextSequence),
+            CorrelationId = correlationId,
+        };
+        setBody(envelope);
+
+        return envelope;
+    }
+
+    private static string GetCommandMethod(WorkerCommand command)
+    {
+        return command.Command?.Kind.ToString() ?? MxCommandKind.Unspecified.ToString();
+    }
+
+    private static string CreateWorkerFaultMessage(WorkerFault fault)
+    {
+        return string.IsNullOrWhiteSpace(fault.DiagnosticMessage)
+            ? $"Worker faulted with category {fault.Category}."
+            : $"Worker faulted with category {fault.Category}: {fault.DiagnosticMessage}";
+    }
+
+    private async Task WaitForBackgroundTasksAsync(CancellationToken cancellationToken)
+    {
+        Task[] tasks = new[] { _readLoopTask, _writeLoopTask, _heartbeatLoopTask }
+            .Where(task => task is not null)
+            .Cast<Task>()
+            .ToArray();
+
+        if (tasks.Length == 0)
+        {
+            return;
+        }
+
+        await Task.WhenAll(tasks).WaitAsync(cancellationToken).ConfigureAwait(false);
+    }
+
+    private void ThrowIfDisposed()
+    {
+        ObjectDisposedException.ThrowIf(_disposed, this);
+    }
+
+    private sealed class PendingCommand
+    {
+        private readonly TaskCompletionSource<WorkerCommandReply> _completion = new(TaskCreationOptions.RunContinuationsAsynchronously);
+
+        public PendingCommand(
+            string correlationId,
+            string method,
+            long startTimestamp)
+        {
+            CorrelationId = correlationId;
+            Method = method;
+            StartTimestamp = startTimestamp;
+        }
+
+        public string CorrelationId { get; }
+
+        public string Method { get; }
+
+        public long StartTimestamp { get; }
+
+        public Task<WorkerCommandReply> Task => _completion.Task;
+
+        public void SetResult(WorkerCommandReply reply)
+        {
+            _completion.TrySetResult(reply);
+        }
+
+        public void SetException(Exception exception)
+        {
+            _completion.TrySetException(exception);
+        }
+    }
+}
@@ -0,0 +1,38 @@
+namespace MxGateway.Server.Workers;
+
+public sealed class WorkerClientConnection
+{
+    public WorkerClientConnection(
+        string sessionId,
+        string nonce,
+        Stream stream,
+        WorkerFrameProtocolOptions frameOptions,
+        WorkerProcessHandle? processHandle = null)
+    {
+        if (string.IsNullOrWhiteSpace(sessionId))
+        {
+            throw new ArgumentException("Session id is required.", nameof(sessionId));
+        }
+
+        if (string.IsNullOrWhiteSpace(nonce))
+        {
+            throw new ArgumentException("Worker nonce is required.", nameof(nonce));
+        }
+
+        SessionId = sessionId;
+        Nonce = nonce;
+        Stream = stream ?? throw new ArgumentNullException(nameof(stream));
+        FrameOptions = frameOptions ?? throw new ArgumentNullException(nameof(frameOptions));
+        ProcessHandle = processHandle;
+    }
+
+    public string SessionId { get; }
+
+    public string Nonce { get; }
+
+    public Stream Stream { get; }
+
+    public WorkerFrameProtocolOptions FrameOptions { get; }
+
+    public WorkerProcessHandle? ProcessHandle { get; }
+}
@@ -0,0 +1,14 @@
+namespace MxGateway.Server.Workers;
+
+public enum WorkerClientErrorCode
+{
+    InvalidState,
+    ProtocolViolation,
+    PipeDisconnected,
+    CommandTimeout,
+    WorkerFaulted,
+    HeartbeatExpired,
+    ShutdownTimeout,
+    GatewayShutdown,
+    WriteFailed,
+}
@@ -0,0 +1,23 @@
+namespace MxGateway.Server.Workers;
+
+public sealed class WorkerClientException : Exception
+{
+    public WorkerClientException(
+        WorkerClientErrorCode errorCode,
+        string message)
+        : base(message)
+    {
+        ErrorCode = errorCode;
+    }
+
+    public WorkerClientException(
+        WorkerClientErrorCode errorCode,
+        string message,
+        Exception innerException)
+        : base(message, innerException)
+    {
+        ErrorCode = errorCode;
+    }
+
+    public WorkerClientErrorCode ErrorCode { get; }
+}
@@ -0,0 +1,24 @@
+namespace MxGateway.Server.Workers;
+
+public sealed class WorkerClientOptions
+{
+    public static readonly TimeSpan DefaultHeartbeatGrace = TimeSpan.FromSeconds(15);
+    public static readonly TimeSpan DefaultHeartbeatCheckInterval = TimeSpan.FromSeconds(1);
+    public static readonly TimeSpan DefaultEventChannelFullModeTimeout = TimeSpan.FromSeconds(5);
+
+    public WorkerClientOptions()
+    {
+        HeartbeatGrace = DefaultHeartbeatGrace;
+        HeartbeatCheckInterval = DefaultHeartbeatCheckInterval;
+        EventChannelCapacity = 1_024;
+        EventChannelFullModeTimeout = DefaultEventChannelFullModeTimeout;
+    }
+
+    public TimeSpan HeartbeatGrace { get; init; }
+
+    public TimeSpan HeartbeatCheckInterval { get; init; }
+
+    public int EventChannelCapacity { get; init; }
+
+    public TimeSpan EventChannelFullModeTimeout { get; init; }
+}
@@ -0,0 +1,11 @@
+namespace MxGateway.Server.Workers;
+
+public enum WorkerClientState
+{
+    Created,
+    Handshaking,
+    Ready,
+    Closing,
+    Closed,
+    Faulted,
+}
@@ -0,0 +1,14 @@
+{
+  "version": "1.0",
+  "defaultProvider": "cdnjs",
+  "libraries": [
+    {
+      "library": "bootstrap@5.3.3",
+      "destination": "wwwroot/lib/bootstrap/",
+      "files": [
+        "css/bootstrap.min.css",
+        "js/bootstrap.bundle.min.js"
+      ]
+    }
+  ]
+}
@@ -0,0 +1,138 @@
+:root {
+    --mxgw-surface: #f7f8fa;
+    --mxgw-border: #d8dee6;
+    --mxgw-ink-muted: #667085;
+    --mxgw-accent: #146c64;
+}
+
+.dashboard-body {
+    background: var(--mxgw-surface);
+    color: #1f2933;
+}
+
+.dashboard-navbar {
+    min-height: 3.5rem;
+}
+
+.dashboard-content {
+    padding: 1.25rem;
+}
+
+.dashboard-page-header {
+    align-items: center;
+    display: flex;
+    gap: 1rem;
+    justify-content: space-between;
+    margin-bottom: 1rem;
+}
+
+.dashboard-page-header h1,
+.section-heading h2 {
+    font-size: 1.35rem;
+    font-weight: 650;
+    letter-spacing: 0;
+    margin: 0;
+}
+
+.section-heading {
+    margin-bottom: .75rem;
+}
+
+.dashboard-section {
+    background: #fff;
+    border-top: 1px solid var(--mxgw-border);
+    margin-top: 1rem;
+    padding: 1rem 0 0;
+}
+
+.metric-grid {
+    display: grid;
+    gap: .75rem;
+    grid-template-columns: repeat(auto-fit, minmax(12rem, 1fr));
+}
+
+.metric-grid.compact {
+    grid-template-columns: repeat(auto-fit, minmax(10rem, 1fr));
+}
+
+.metric-card {
+    border-color: var(--mxgw-border);
+    border-radius: .375rem;
+    box-shadow: none;
+}
+
+.metric-label {
+    color: var(--mxgw-ink-muted);
+    font-size: .78rem;
+    font-weight: 650;
+    letter-spacing: 0;
+    text-transform: uppercase;
+}
+
+.metric-value {
+    color: var(--mxgw-accent);
+    font-size: 1.7rem;
+    font-weight: 700;
+    letter-spacing: 0;
+    line-height: 1.25;
+    overflow-wrap: anywhere;
+}
+
+.metric-detail {
+    color: var(--mxgw-ink-muted);
+    font-size: .85rem;
+    overflow-wrap: anywhere;
+}
+
+.dashboard-table {
+    --bs-table-bg: #fff;
+    border-color: var(--mxgw-border);
+    margin-bottom: 0;
+}
+
+.dashboard-table th {
+    color: #344054;
+    font-weight: 650;
+    white-space: nowrap;
+}
+
+.dashboard-table td {
+    max-width: 24rem;
+    overflow-wrap: anywhere;
+}
+
+.details-table th {
+    width: 14rem;
+}
+
+.empty-state {
+    background: #fff;
+    border: 1px dashed var(--mxgw-border);
+    border-radius: .375rem;
+    color: var(--mxgw-ink-muted);
+    padding: 1rem;
+}
+
+.dashboard-login {
+    max-width: 28rem;
+}
+
+.login-card {
+    border-color: var(--mxgw-border);
+    border-radius: .375rem;
+}
+
+@media (max-width: 700px) {
+    .dashboard-content {
+        padding: .75rem;
+    }
+
+    .dashboard-page-header {
+        align-items: flex-start;
+        flex-direction: column;
+    }
+
+    .details-table th {
+        width: 9rem;
+    }
+}
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
Joseph Doherty	1f92078777	Merge remote-tracking branch 'origin/main' into agent-1/issue-37-create-cross-language-client-behavior-fixtures	2026-04-26 19:12:19 -04:00
Joseph Doherty	108a3d3f8a	Add client behavior fixtures	2026-04-26 19:11:04 -04:00
dohertj2	95e71cd819	Merge pull request #83 from agent-2/issue-29-implement-event-sink-and-event-queue Issue #29: implement event sink and event queue	2026-04-26 19:08:52 -04:00
Joseph Doherty	647fe9a4b5	Merge remote-tracking branch 'origin/main' into agent-2/issue-29-implement-event-sink-and-event-queue	2026-04-26 19:05:31 -04:00
Joseph Doherty	dd455089b4	Implement worker MXAccess event queue	2026-04-26 19:04:56 -04:00
dohertj2	d0bc4e3c01	Merge pull request #82 from agent-1/issue-36-publish-stable-client-proto-generation-inputs Issue #36: publish stable client proto generation inputs	2026-04-26 18:56:37 -04:00
Joseph Doherty	6a40d26366	Publish stable client proto inputs	2026-04-26 18:52:39 -04:00
dohertj2	366f57198f	Merge pull request #81 from agent-2/issue-28-implement-advise-unadvise-advisesupervisory Issue #28: implement Advise, UnAdvise, AdviseSupervisory	2026-04-26 18:45:59 -04:00
dohertj2	aab41e04ab	Merge pull request #80 from agent-1/issue-16-implement-blazor-server-dashboard Issue #16: implement Blazor Server dashboard	2026-04-26 18:41:26 -04:00
Joseph Doherty	3be92a17bd	Merge remote-tracking branch 'origin/main' into agent-2/issue-28-implement-advise-unadvise-advisesupervisory	2026-04-26 18:41:17 -04:00
Joseph Doherty	a871f2f2e5	Implement worker advise commands	2026-04-26 18:41:10 -04:00
Joseph Doherty	7b86bab705	Merge remote-tracking branch 'origin/main' into agent-1/issue-16-implement-blazor-server-dashboard	2026-04-26 18:38:19 -04:00
Joseph Doherty	56886c3b4e	Implement Blazor Server dashboard	2026-04-26 18:37:16 -04:00
dohertj2	a3ccd5c80b	Merge pull request #79 from agent-3/issue-19-gateway-e2e-smoke-with-fake-worker Issue #19: gateway end-to-end smoke with fake worker	2026-04-26 18:34:54 -04:00
dohertj2	0fd954d94c	Merge pull request #78 from agent-2/issue-27-implement-additem-additem2-removeitem Issue #27: implement AddItem, AddItem2, RemoveItem	2026-04-26 18:32:13 -04:00
Joseph Doherty	91f2d8dc14	Merge remote-tracking branch 'origin/main' into agent-3/issue-19-gateway-e2e-smoke-with-fake-worker	2026-04-26 18:31:49 -04:00
Joseph Doherty	fb425da009	Add gateway fake worker end-to-end smoke	2026-04-26 18:30:11 -04:00
Joseph Doherty	c7e4c4b614	Merge remote-tracking branch 'origin/main' into agent-2/issue-27-implement-additem-additem2-removeitem	2026-04-26 18:27:00 -04:00
Joseph Doherty	59c710d789	Implement worker AddItem commands	2026-04-26 18:26:44 -04:00
dohertj2	862f119b91	Merge pull request #77 from agent-3/issue-18-build-fake-worker-test-harness Issue #18: build fake worker test harness	2026-04-26 18:25:00 -04:00
Joseph Doherty	35e4442c7b	Build fake worker test harness	2026-04-26 18:20:45 -04:00
dohertj2	ed1018c3bb	Merge pull request #76 from agent-1/issue-17-implement-dashboard-authentication Issue #17: implement dashboard authentication	2026-04-26 18:18:43 -04:00
Joseph Doherty	2e4ba11a9f	Merge remote-tracking branch 'origin/main' into agent-1/issue-17-implement-dashboard-authentication	2026-04-26 18:15:38 -04:00
Joseph Doherty	ff86b3f0b0	Implement dashboard authentication	2026-04-26 18:15:22 -04:00
dohertj2	653f17c669	Merge pull request #75 from agent-2/issue-26-implement-register-and-unregister Issue #26: implement Register and Unregister	2026-04-26 18:13:41 -04:00
Joseph Doherty	556c3bfa83	Implement worker register and unregister	2026-04-26 18:08:45 -04:00
dohertj2	9b3637257c	Merge pull request #74 from agent-3/issue-14-implement-event-streaming-and-backpressure Issue #14: implement event streaming and backpressure	2026-04-26 18:03:32 -04:00
Joseph Doherty	77eac95f33	Issue #14 : implement event streaming and backpressure	2026-04-26 17:59:37 -04:00
dohertj2	015fa1f50d	Merge pull request #73 from agent-1/issue-15-implement-dashboard-snapshot-service Issue #15: implement dashboard snapshot service	2026-04-26 17:56:01 -04:00
dohertj2	dede407304	Merge pull request #72 from agent-2/issue-25-implement-sta-command-dispatcher Issue #25: implement STA command dispatcher	2026-04-26 17:53:32 -04:00
Joseph Doherty	0d96963c99	Merge remote-tracking branch 'origin/main' into agent-1/issue-15-implement-dashboard-snapshot-service	2026-04-26 17:52:58 -04:00
Joseph Doherty	3661420f0a	Issue #15 : implement dashboard snapshot service	2026-04-26 17:49:59 -04:00
Joseph Doherty	14419853c7	Issue #25 : implement sta command dispatcher	2026-04-26 17:49:01 -04:00
dohertj2	a20517f5ad	Merge pull request #71 from agent-3/issue-13-implement-public-grpc-service Issue #13: implement public grpc service	2026-04-26 17:48:35 -04:00
dohertj2	626e7762d9	Merge PR #70 : Issue #31 implement MXSTATUS_PROXY and HRESULT conversion Verified after merging current main with dotnet build src\\MxGateway.sln, dotnet test src\\MxGateway.Worker.Tests\\MxGateway.Worker.Tests.csproj -p:Platform=x86, and dotnet test src\\MxGateway.sln --no-build.	2026-04-26 17:43:08 -04:00
Joseph Doherty	8d6d3f6188	Issue #13 : implement public grpc service	2026-04-26 17:42:46 -04:00
Joseph Doherty	276288ad87	Merge remote-tracking branch 'origin/main' into agent-2/issue-31-implement-mxstatus-proxy-and-hresult-conversion	2026-04-26 17:39:48 -04:00
dohertj2	76bd3de5a2	Merge PR #69 : Issue #24 create MXAccess COM object on STA Verified with dotnet build src\\MxGateway.sln, dotnet test src\\MxGateway.Worker.Tests\\MxGateway.Worker.Tests.csproj -p:Platform=x86, and dotnet test src\\MxGateway.sln --no-build.	2026-04-26 17:39:04 -04:00
Joseph Doherty	29455fc1f6	Issue #31 : implement mxstatus proxy and hresult conversion	2026-04-26 17:35:30 -04:00
dohertj2	5511609880	Merge PR #68 : Issue #12 implement session manager and registry Verified with dotnet build src\\MxGateway.sln and dotnet test src\\MxGateway.sln.	2026-04-26 17:34:19 -04:00
Joseph Doherty	451dccf7e3	Issue #24 : create mxaccess com object on sta	2026-04-26 17:34:12 -04:00
dohertj2	cde9c89386	Merge PR #67 : Issue #30 implement value conversion Verified with dotnet build src\\MxGateway.sln, dotnet test src\\MxGateway.Worker.Tests\\MxGateway.Worker.Tests.csproj -p:Platform=x86, and dotnet test src\\MxGateway.sln --no-build.	2026-04-26 17:30:19 -04:00
Joseph Doherty	d496f1fd75	Issue #12 : implement session manager and registry	2026-04-26 17:29:47 -04:00
Joseph Doherty	6559672fc1	Issue #30 : implement value conversion	2026-04-26 17:26:36 -04:00
dohertj2	97c30b9d00	Merge PR #66 : Issue #23 implement STA runtime and message pump Verified with dotnet build src\\MxGateway.sln, dotnet test src\\MxGateway.Worker.Tests\\MxGateway.Worker.Tests.csproj -p:Platform=x86, and dotnet test src\\MxGateway.sln --no-build.	2026-04-26 17:23:02 -04:00
dohertj2	603aff7004	Merge PR #65 : Issue #22 implement pipe client and frame protocol Verified with dotnet build src\\MxGateway.sln, dotnet test src\\MxGateway.Worker.Tests\\MxGateway.Worker.Tests.csproj -p:Platform=x86, and dotnet test src\\MxGateway.sln --no-build.	2026-04-26 17:20:28 -04:00
Joseph Doherty	e81682e367	Issue #23 : implement sta runtime and message pump	2026-04-26 17:19:00 -04:00
Joseph Doherty	d5a982152b	Issue #22 : implement pipe client and frame protocol	2026-04-26 17:16:49 -04:00
dohertj2	0b0be7098e	Merge PR #64 : Issue #11 implement gateway WorkerClient Verified with dotnet build src\\MxGateway.sln and dotnet test src\\MxGateway.sln.	2026-04-26 17:14:03 -04:00
Joseph Doherty	fce9e99553	Issue #11 : implement gateway workerclient	2026-04-26 17:09:51 -04:00
dohertj2	c8fb3e91a3	Merge PR #63 : Issue #8 add gRPC authentication and scope authorization Verified with dotnet build src\\MxGateway.sln and dotnet test src\\MxGateway.sln.	2026-04-26 17:06:23 -04:00
dohertj2	8ce327e6f4	Merge PR #62 : Issue #7 implement local api key admin cli Verified with dotnet build src\\MxGateway.sln and dotnet test src\\MxGateway.sln.	2026-04-26 17:02:09 -04:00
Joseph Doherty	fad0ac9948	Issue #8 : add grpc authentication and scope authorization	2026-04-26 17:01:59 -04:00