diff --git a/docs/reconstruction-coverage.md b/docs/reconstruction-coverage.md
index f2f184ad14..a3cc64a63a 100644
--- a/docs/reconstruction-coverage.md
+++ b/docs/reconstruction-coverage.md
@@ -28,6 +28,11 @@ this effective scope. A claim verifier must commit to its own surfaces and
 their reachable dependencies, including their artifact and implemented-owner
 digests. Callers do not need to duplicate the transitive closure in the request.
 
+Listed `residual_unknown_ids` select unknown identities from the Evidence bundle.
+The evaluator uses each identity's latest revision: resolved questions do not
+block the boundary, while reopened questions do. An active, unallowed question
+retains its cited supporting, contradicting and mutation Evidence in the result.
+
 ## Comparable verifier Evidence
 
 At least one record explicitly cited by the latest verifier observation must
diff --git a/src/domain/reconstructionCoverageEvaluation.ts b/src/domain/reconstructionCoverageEvaluation.ts
index dfd0c4063b..eca7c2d835 100644
--- a/src/domain/reconstructionCoverageEvaluation.ts
+++ b/src/domain/reconstructionCoverageEvaluation.ts
@@ -1,3 +1,4 @@
+import { reconstructionUnknownHeads } from "./reconstructionUnknowns.js";
 import type { ReconstructionCoverageScope } from "./reconstructionCoverageScope.js";
 import type {
   ReconstructionClosureResult,
@@ -396,14 +397,27 @@ const verifierResultMatchesContract = (
 export const evaluateReconstructionCoverageRisks = (
   context: ReconstructionEvaluationContext,
 ): void => {
-  for (const unknownId of context.coverage.residual_unknown_ids)
-    if (!context.boundary.allowed_unknown_ids.includes(unknownId))
+  const unknownHeads = reconstructionUnknownHeads(
+    context.coverage.evidence_bundle.unknowns,
+  );
+  for (const unknownId of new Set(context.coverage.residual_unknown_ids)) {
+    const unknown = unknownHeads.get(unknownId);
+    if (unknown?.status === "resolved") continue;
+    if (!context.boundary.allowed_unknown_ids.includes(unknownId)) {
+      if (unknown !== undefined)
+        addEvidence(context, [
+          ...unknown.supporting_evidence_ids,
+          ...unknown.contradicting_evidence_ids,
+          ...unknown.mutation_evidence_ids,
+        ]);
       addReason(
         context,
         "active-unknown",
         unknownId,
         "Active residual unknown is not permitted by the completion boundary.",
       );
+    }
+  }
   for (const contradiction of context.coverage.contradictions)
     if (
       contradiction.status === "active" &&
diff --git a/tests/boundary/mcp/reconstructionCoverageMcp.test.ts b/tests/boundary/mcp/reconstructionCoverageMcp.test.ts
index d1478f5101..088b93d40b 100644
--- a/tests/boundary/mcp/reconstructionCoverageMcp.test.ts
+++ b/tests/boundary/mcp/reconstructionCoverageMcp.test.ts
@@ -9,11 +9,107 @@ import {
   reconstructionCoverageDataFixture,
 } from "../../../src/domain/reconstructionCoverage.fixture.js";
 import { createEvidence } from "../../../src/domain/evidence.js";
+import {
+  createResidualUnknown,
+  recordUnknownInputSchema,
+  updateResidualUnknown,
+} from "../../../src/domain/residualUnknown.js";
 import { createEvidenceBundle } from "../../../src/domain/evidenceBundle.js";
 import { createTestBinarySession } from "../../fixtures/binarySession.js";
 import { createServer } from "../../../src/server/createServer.js";
 import { observed } from "../../fixtures/analysisExecution.js";
 
+it("uses the latest listed unknown revision when evaluating a boundary", async () => {
+  await withCoverageMcp(async ({ client }) => {
+    const base = currentFixtureCoverage();
+    const [first, second] = base.evidence_bundle.records;
+    if (first === undefined || second === undefined)
+      throw new Error("Missing fixture Evidence");
+    const unknownSource = createEvidence(
+      undefined,
+      { id: "unknown-source", name: "Unknown source", version: "1" },
+      {
+        operation: "observe_unknown",
+        parameters: {},
+        result: { evidence: true },
+      },
+    );
+    const input = recordUnknownInputSchema.parse({
+      question: "Is the route covered?",
+      supporting_evidence_ids: [unknownSource.evidence_id],
+      domain: "fixture",
+      severity: "medium",
+      required_authority: null,
+      required_confidence: "derived",
+      required_environment: null,
+      recommended_probes: [],
+      relationships: [],
+    });
+    const open = createResidualUnknown(input, first.evidence_id, null);
+    const resolved = updateResidualUnknown(
+      open,
+      {
+        ...input,
+        unknown_id: open.unknown_id,
+        expected_revision: 1,
+        status: "resolved",
+        resolution: {
+          disposition: "withdrawn",
+          rationale: "No longer applicable",
+          evidence_ids: [],
+        },
+      },
+      second.evidence_id,
+    );
+    const reopened = updateResidualUnknown(
+      resolved,
+      {
+        ...input,
+        unknown_id: open.unknown_id,
+        expected_revision: 2,
+        status: "investigating",
+        resolution: null,
+      },
+      second.evidence_id,
+    );
+    const coverage = (revisions: (typeof open)[]) => ({
+      ...base,
+      evidence_bundle: createEvidenceBundle(
+        [...base.evidence_bundle.records, unknownSource],
+        revisions,
+      ),
+      residual_unknown_ids: [open.unknown_id, open.unknown_id],
+    });
+    expect(
+      (await evaluate(client, coverage([open]))).structuredContent,
+    ).toMatchObject({
+      status: "unknown",
+      evidence_ids: expect.arrayContaining([unknownSource.evidence_id]),
+      reasons: [
+        expect.objectContaining({
+          code: "active-unknown",
+          subject_id: open.unknown_id,
+        }),
+      ],
+    });
+    expect(
+      (await evaluate(client, coverage([open, resolved]))).structuredContent,
+    ).toMatchObject({ status: "ready", reasons: [] });
+    expect(
+      (await evaluate(client, coverage([open, resolved, reopened])))
+        .structuredContent,
+    ).toMatchObject({
+      status: "unknown",
+      reasons: [
+        expect.objectContaining({
+          code: "active-unknown",
+          subject_id: open.unknown_id,
+        }),
+      ],
+    });
+  });
+});
+
 describe("reconstruction coverage inline Evidence", () => {
   it("evaluates inline fail-closed coverage without retaining request Evidence", async () => {
     await withCoverageMcp(async ({ client, session }) => {