diff --git a/archreview/plans/R2-02-resilience-config-hardening-plan.md.tasks.json b/archreview/plans/R2-02-resilience-config-hardening-plan.md.tasks.json
index 26510721..b04bd71d 100644
--- a/archreview/plans/R2-02-resilience-config-hardening-plan.md.tasks.json
+++ b/archreview/plans/R2-02-resilience-config-hardening-plan.md.tasks.json
@@ -2,7 +2,7 @@
   "planPath": "archreview/plans/R2-02-resilience-config-hardening-plan.md",
   "tasks": [
     { "id": 0, "subject": "S-6 brick-repro test (RED): parsed timeoutSeconds:0 / breakerFailureThreshold:1 must not brick capability calls — ResilienceConfigBrickTests, expect 2 failures on f6eaa267", "status": "pending", "blockedBy": [] },
-    { "id": 1, "subject": "Add ResiliencePolicyRanges constants to Core.Abstractions (single source of truth for parser/builder/AdminUI, derived from Polly.Core 8.6.6 validation)", "status": "pending", "blockedBy": [] },
+    { "id": 1, "subject": "Add ResiliencePolicyRanges constants to Core.Abstractions (single source of truth for parser/builder/AdminUI, derived from Polly.Core 8.6.6 validation)", "status": "completed", "blockedBy": [] },
     { "id": 2, "subject": "S-6 parser: clamp timeout/retry/breaker overrides with appending diagnostics (timeout<=0 -> tier default; breaker==1 -> 2; caps) + 8 parser tests", "status": "pending", "blockedBy": [0, 1] },
     { "id": 3, "subject": "S-6 builder: belt-and-braces clamp in Build so pipeline construction can never throw ValidationException + Build_NeverThrows_ForHostileDirectOptions (turns task 0 green)", "status": "pending", "blockedBy": [0, 1] },
     { "id": 4, "subject": "S-6 production-wiring guard: DriverCapabilityInvokerFactory.Create with hostile JSON yields a working invoker + logged clamp diagnostic; re-run ResilienceInvokerFactoryRegistrationTests", "status": "pending", "blockedBy": [2, 3] },
diff --git a/src/Core/ZB.MOM.WW.OtOpcUa.Core.Abstractions/ResiliencePolicyRanges.cs b/src/Core/ZB.MOM.WW.OtOpcUa.Core.Abstractions/ResiliencePolicyRanges.cs
new file mode 100644
index 00000000..4fa8cb86
--- /dev/null
+++ b/src/Core/ZB.MOM.WW.OtOpcUa.Core.Abstractions/ResiliencePolicyRanges.cs
@@ -0,0 +1,33 @@
+namespace ZB.MOM.WW.OtOpcUa.Core.Abstractions;
+
+/// <summary>
+///     Legal ranges for per-capability resilience policy values. Single source of truth shared by
+///     <c>DriverResilienceOptionsParser</c> (clamp + diagnostic), <c>DriverResiliencePipelineBuilder</c>
+///     (last-resort clamp so a pipeline build can never throw Polly's ValidationException), and the
+///     AdminUI <c>ResilienceFormModel</c> (authoring-time validation messages). Derived from
+///     Polly.Core 8.6.6's option validation: <c>TimeoutStrategyOptions.Timeout</c> ∈ [10 ms, 24 h];
+///     <c>CircuitBreakerStrategyOptions.MinimumThroughput</c> ≥ 2.
+/// </summary>
+public static class ResiliencePolicyRanges
+{
+    /// <summary>Minimum per-call timeout. Whole-second granularity puts the floor at 1 s (Polly's is 10 ms).</summary>
+    public const int MinTimeoutSeconds = 1;
+
+    /// <summary>Maximum per-call timeout — Polly's TimeoutStrategyOptions ceiling (24 h).</summary>
+    public const int MaxTimeoutSeconds = 86_400;
+
+    /// <summary>Retry floor; 0 = no retry strategy is added to the pipeline.</summary>
+    public const int MinRetryCount = 0;
+
+    /// <summary>Operational retry cap (Polly itself allows int.MaxValue; 100 exponential-backoff attempts ≈ minutes).</summary>
+    public const int MaxRetryCount = 100;
+
+    /// <summary>Breaker floor; 0 = no breaker strategy is added (the Tier C posture).</summary>
+    public const int MinBreakerFailureThreshold = 0;
+
+    /// <summary>Polly's MinimumThroughput floor — an enabled breaker needs a threshold of at least 2.</summary>
+    public const int MinEnabledBreakerFailureThreshold = 2;
+
+    /// <summary>Sanity cap on the breaker threshold (Polly has no ceiling; beyond this it can never trip in the 30 s window).</summary>
+    public const int MaxBreakerFailureThreshold = 10_000;
+}