diff --git a/docs/drivers/TestConnectProbes.md b/docs/drivers/TestConnectProbes.md
index 9d224a4b..c539f888 100644
--- a/docs/drivers/TestConnectProbes.md
+++ b/docs/drivers/TestConnectProbes.md
@@ -47,7 +47,7 @@ with a human-readable explanation rather than a false-green TCP-open tick.
 | **AbCip** | `libplctag` Tag `InitializeAsync` (EIP session + CIP Forward Open). A CIP-level error such as tag-not-found still proves the controller answered CIP → `Ok`. A session/ForwardOpen/connect error → handshake fail. | `"CIP session OK"` | `10.100.0.35:44818` (CIP sim) |
 | **AbLegacy** | Same `libplctag` `InitializeAsync` handshake as AbCip, PCCC protocol family. | `"CIP session OK"` (PCCC family) | Deferred — no PLC5/SLC sim |
 | **TwinCAT** | `AdsClient.Connect` + `ReadStateAsync`. See [degrade semantics](#twincat-degrade) below. | `"ADS state: {state}"` | Deferred — no ADS target |
-| **FOCAS** | `cnc_allclibhndl3` via FWLIB P/Invoke (`Wire.WireFocasClient`). See [degrade semantics](#focas-degrade) below. | `"FOCAS handle OK"` | Deferred — no CNC + FWLIB |
+| **FOCAS** | `cnc_allclibhndl3` via a direct `DllImport("fwlib32")` in the probe. See [degrade semantics](#focas-degrade) below. | `"FOCAS handle OK"` | Deferred — no CNC + FWLIB |
 | **Galaxy** | gRPC unary call to `GalaxyRepository.TestConnection` on the configured mxaccessgw endpoint. See [auth-rejection rule](#galaxy-auth-rejection) below. | `"gateway gRPC OK"` | `http://10.100.0.48:5120` (mxaccessgw) |
 
 **Historian.Wonderware** already performed a real handshake (`Hello` → `HelloAck`)
@@ -86,7 +86,9 @@ managed AMS router cannot start):
 
 On a Windows host with the FANUC FWLIB shared library present:
 
-- `cnc_allclibhndl3` is called via the existing `Wire.WireFocasClient` P/Invoke.
+- `cnc_allclibhndl3` is called via a direct `DllImport("fwlib32")` declared in
+  the probe (the production `Wire.WireFocasClient` is a pure-managed FOCAS/2 TCP
+  client, not an FWLIB P/Invoke, so the probe carries its own native binding).
   A successful handle allocation → `Ok=true`, `"FOCAS handle OK"`.
 - A CNC-level rejection → handshake fail.
 
diff --git a/docs/plans/2026-06-16-stillpending-phase-5-probes-design.md b/docs/plans/2026-06-16-stillpending-phase-5-probes-design.md
index 42940277..c30a5df4 100644
--- a/docs/plans/2026-06-16-stillpending-phase-5-probes-design.md
+++ b/docs/plans/2026-06-16-stillpending-phase-5-probes-design.md
@@ -26,7 +26,8 @@ operator gets a false "connection OK" and only discovers the truth when the driv
   - TwinCAT: `AdsClient.Connect(netId, port)` + `ReadStateAsync` (`AdsTwinCATClient.cs:90,194`).
   - OpcUaClient: `DiscoveryClient.GetEndpointsAsync` (no session / cert / auth — `OpcUaClientDriver.cs:422`).
   - Galaxy: the `MxGateway.Client` gRPC channel + one lightweight unary call.
-  - FOCAS: `cnc_allclibhndl3` via the existing wire P/Invoke (`Wire.WireFocasClient`).
+  - FOCAS: `cnc_allclibhndl3` via a direct `DllImport("fwlib32")` in the probe (the production
+    `Wire.WireFocasClient` is pure-managed FOCAS/2 TCP, not an FWLIB P/Invoke).
 - **Probe dispatch** clamps the timeout to 1–60 s and passes a cancelled-on-timeout `ct`
   (`AdminOperationsActor.cs:284-291`). Probes MUST honour it and MUST NOT mutate state (read-only handshakes).
 - **A proven skip-gated E2E harness exists** (`DriverTestConnectE2eTests`) targeting the live Modbus sim with