diff --git a/src/signals/local-branch.ts b/src/signals/local-branch.ts
index a564ef01fc..dda18172f5 100644
--- a/src/signals/local-branch.ts
+++ b/src/signals/local-branch.ts
@@ -246,6 +246,7 @@ export function buildLocalBranchAnalysis(args: {
     testFiles,
     linkedIssueCount: preflight.linkedIssues.length,
     linkedIssueContext,
+    duplicateRiskCount: preflight.collisions.filter((cluster) => cluster.risk === "high").length,
     roleContext,
     outcomeHistory: args.outcomeHistory,
     repoOutcome,
@@ -388,6 +389,7 @@ function buildLocalScoreInput(args: {
   testFiles: string[];
   linkedIssueCount: number;
   linkedIssueContext?: LinkedIssueMultiplierContext | undefined;
+  duplicateRiskCount: number;
   roleContext: RoleContext;
   outcomeHistory: ContributorOutcomeHistory;
   repoOutcome?: ContributorOutcomeHistory["repoOutcomes"][number] | undefined;
@@ -424,6 +426,7 @@ function buildLocalScoreInput(args: {
     observedDraftPrCount: args.observedPullRequestScenarios.draft,
     observedBlockedPrCount: args.observedPullRequestScenarios.blocked,
     observedMaintainerPrCount: args.observedPullRequestScenarios.maintainerLane,
+    duplicateRiskCount: args.duplicateRiskCount,
     expectedOpenPrCountAfterMerge: args.input.expectedOpenPrCountAfterMerge,
     projectedCredibility: args.input.projectedCredibility,
     scenarioNotes: args.input.scenarioNotes,
diff --git a/src/signals/reward-risk.ts b/src/signals/reward-risk.ts
index 96447f3d8c..9c17cf8b57 100644
--- a/src/signals/reward-risk.ts
+++ b/src/signals/reward-risk.ts
@@ -197,6 +197,7 @@ export function buildRepoRewardRisk(args: {
     existingContributorTokenScore: 0,
     credibility,
     metadataOnly: true,
+    duplicateRiskCount: collisions.summary.highRiskCount,
   };
   const currentPreview = buildScorePreview({
     input: { ...commonPreviewInput, openPrCount: currentOpenPrCount },
diff --git a/test/unit/local-branch.test.ts b/test/unit/local-branch.test.ts
index 9e218b26a8..43d16474d4 100644
--- a/test/unit/local-branch.test.ts
+++ b/test/unit/local-branch.test.ts
@@ -63,6 +63,36 @@ describe("local branch analysis", () => {
     expect(JSON.stringify(analysis.prPacket)).not.toMatch(/reward|score|wallet|hotkey|farming|payout|ranking|trust score/i);
   });
 
+  it("threads duplicate collision risk into private scoreability blockers", () => {
+    const analysis = buildLocalBranchAnalysis({
+      input: {
+        login: "oktofeesh1",
+        repoFullName: repo.fullName,
+        branchName: "fix-cache-duplicate",
+        title: "Fix dashboard cache refresh after reconnect",
+        linkedIssues: [7],
+        changedFiles: [{ path: "src/cache.ts", additions: 12, deletions: 2, status: "modified" }],
+        localScorer: { mode: "external_command", sourceTokenScore: 20, totalTokenScore: 30, sourceLines: 14 },
+      },
+      repo,
+      issues: [{ repoFullName: repo.fullName, number: 7, title: "Dashboard cache refresh fails after reconnect", state: "open", labels: ["bug"], linkedPrs: [10, 11] }],
+      pullRequests: [
+        { repoFullName: repo.fullName, number: 10, title: "Fix dashboard cache refresh", state: "open", authorLogin: "other-dev", authorAssociation: "NONE", labels: [], linkedIssues: [7], body: "", updatedAt: "2026-05-25T00:00:00.000Z" },
+        { repoFullName: repo.fullName, number: 11, title: "Repair dashboard reconnect cache", state: "open", authorLogin: "third-dev", authorAssociation: "NONE", labels: [], linkedIssues: [7], body: "", updatedAt: "2026-05-25T00:00:00.000Z" },
+      ],
+      profile,
+      outcomeHistory,
+      scoringSnapshot,
+      scoringProfile,
+    });
+
+    expect(analysis.preflight.collisions.filter((cluster) => cluster.risk === "high").length).toBeGreaterThan(0);
+    expect(analysis.scorePreview.blockedBy).toEqual(
+      expect.arrayContaining([expect.objectContaining({ code: "duplicate_risk", severity: "reducer" })]),
+    );
+    expect(analysis.scorePreview.warnings.join(" ")).toMatch(/duplicate-risk/i);
+  });
+
   it("bounds local scorer warnings before adding local findings", () => {
     const analysis = buildLocalBranchAnalysis({
       input: {
diff --git a/test/unit/signals-coverage.test.ts b/test/unit/signals-coverage.test.ts
index 583bb8b206..c59969de0e 100644
--- a/test/unit/signals-coverage.test.ts
+++ b/test/unit/signals-coverage.test.ts
@@ -511,6 +511,39 @@ describe("signal coverage edge cases", () => {
     expect(issueCleanup.actions.map((action) => action.actionKind)).not.toContain("land_existing_prs");
   });
 
+  it("threads duplicate collision risk into reward-risk scoreability blockers", () => {
+    const targetRepo = repo("owner/duplicates");
+    const profile = buildContributorProfile("dev", { login: "dev", topLanguages: ["TypeScript"], source: "github" }, [], []);
+    const history = buildContributorOutcomeHistory({
+      login: "dev",
+      profile,
+      repositories: [targetRepo],
+      pullRequests: [],
+      issues: [],
+      repoStats: [],
+    });
+    const fit = buildContributorFit(profile, [targetRepo], [], [], [], []);
+    const result = buildRepoRewardRisk({
+      login: "dev",
+      repo: targetRepo,
+      repoFullName: targetRepo.fullName,
+      profile,
+      outcomeHistory: history,
+      scoringSnapshot: scoringSnapshot(),
+      scoringProfile: buildContributorScoringProfile({ login: "dev", fit, scoringSnapshot: scoringSnapshot() }),
+      issues: [issue(targetRepo.fullName, 7, "Dashboard cache refresh fails after reconnect", { linkedPrs: [10, 11] })],
+      pullRequests: [
+        pr(targetRepo.fullName, 10, "Fix dashboard cache refresh", { linkedIssues: [7] }),
+        pr(targetRepo.fullName, 11, "Repair dashboard reconnect cache", { linkedIssues: [7] }),
+      ],
+    });
+
+    expect(result.riskBreakdown.highRiskDuplicateClusters).toBeGreaterThan(0);
+    expect(result.currentPreview.blockedBy).toEqual(
+      expect.arrayContaining([expect.objectContaining({ code: "duplicate_risk", severity: "reducer" })]),
+    );
+  });
+
   it("flags possible duplicate work when the planned title overlaps an existing cluster", () => {
     // Regression: previously the preflight used `item.title.includes(input.title)`,
     // so a longer/more descriptive planned title never matched a shorter existing