diff --git a/src/clawsweeper.ts b/src/clawsweeper.ts
index 582139c5a5..2a6b8a714d 100644
--- a/src/clawsweeper.ts
+++ b/src/clawsweeper.ts
@@ -54,6 +54,7 @@ import {
 } from "./github-retry.js";
 import { parseGhJson, parseGhJsonLinesWithRetry, parseGhJsonWithRetry } from "./github-json.js";
 import { stableJson } from "./stable-json.js";
+import { reviewPullChecksDigestParts } from "./review-checks-digest.js";
 import { coverageTrackedItemIdsFromManifest } from "./review-coverage-manifest.js";
 import {
   LEGACY_FIXED_CLOSE_SKIP_ACTIONS,
@@ -3184,7 +3185,7 @@ function itemContentDigest(item: Item, context: ItemContext, git?: GitInfo): str
         ? (context.pullReviewCommentsRevision ??
           reviewCommentDigestParts(context.pullReviewComments))
         : null,
-      checks: isPull ? (context.pullChecks ?? null) : null,
+      checks: isPull ? reviewPullChecksDigestParts(context.pullChecks ?? null) : null,
     }),
   );
 }
@@ -9165,7 +9166,7 @@ function fetchReviewStructuralRecord(options: {
     if (!headSha) return null;
     const pullChecks = pullChecksContext(options.item.number, headSha);
     if (!completePullChecksContext(pullChecks)) return null;
-    pullChecksDigest = sha256(stableJson(pullChecks));
+    pullChecksDigest = sha256(stableJson(reviewPullChecksDigestParts(pullChecks)));
   }
   return reviewStructuralRecordFromGraphql({
     response,
diff --git a/src/review-checks-digest.ts b/src/review-checks-digest.ts
new file mode 100644
index 0000000000..762c50dea7
--- /dev/null
+++ b/src/review-checks-digest.ts
@@ -0,0 +1,17 @@
+import { stableJsonCodeUnit } from "./stable-json.js";
+
+export function reviewPullChecksDigestParts(value: unknown): unknown {
+  if (!value || typeof value !== "object" || Array.isArray(value)) return value;
+  const checks = value as Record<string, unknown>;
+  if (!Array.isArray(checks.checkRuns)) return value;
+
+  const seen = new Set<string>();
+  const checkRuns = checks.checkRuns.filter((checkRun) => {
+    const identity = stableJsonCodeUnit(checkRun);
+    if (seen.has(identity)) return false;
+    seen.add(identity);
+    return true;
+  });
+
+  return checkRuns.length === checks.checkRuns.length ? value : { ...checks, checkRuns };
+}
diff --git a/src/review-semantic-cache.ts b/src/review-semantic-cache.ts
index dfc1d14614..3de09f1eec 100644
--- a/src/review-semantic-cache.ts
+++ b/src/review-semantic-cache.ts
@@ -6,6 +6,7 @@ import { createVirtualFileSystem, type FileSystem } from "typescript/unstable/fs
 import { API } from "typescript/unstable/sync";
 
 import { REVIEW_CACHE_MAX_AGE_DAYS } from "./scheduler-policy.js";
+import { reviewPullChecksDigestParts } from "./review-checks-digest.js";
 import { stableJsonCodeUnit as stableJson } from "./stable-json.js";
 
 export const REVIEW_SEMANTIC_CACHE_VERSION = 10;
@@ -782,7 +783,7 @@ function semanticContext(input: ReviewSemanticInput): {
     reviewComments:
       input.context.pullReviewCommentsRevision ??
       normalizedComments(input.context.pullReviewComments),
-    checks: input.context.pullChecks ?? null,
+    checks: reviewPullChecksDigestParts(input.context.pullChecks ?? null),
     completeness: {
       commentsTruncated: input.context.counts?.commentsTruncated ?? null,
       timelineTruncated: input.context.counts?.timelineTruncated ?? null,
diff --git a/test/review-comment-rendering.test.ts b/test/review-comment-rendering.test.ts
index 503623e689..8dc2156609 100644
--- a/test/review-comment-rendering.test.ts
+++ b/test/review-comment-rendering.test.ts
@@ -166,7 +166,10 @@ test("structural cache probes before hydration but acquires a lease before carry
     source.indexOf("function collectItemContext"),
   );
   assert.match(structuralProbeSource, /pullChecksContext\(options\.item\.number, headSha\)/);
-  assert.match(structuralProbeSource, /pullChecksDigest = sha256\(stableJson\(pullChecks\)\)/);
+  assert.match(
+    structuralProbeSource,
+    /pullChecksDigest = sha256\(stableJson\(reviewPullChecksDigestParts\(pullChecks\)\)\)/,
+  );
   assert.match(structuralProbeSource, /if \(!options\.git\.releaseStateComplete\) return null/);
   const gitInfoBlock = source.slice(
     source.indexOf("function gitInfo("),
diff --git a/test/review-content-cache.test.ts b/test/review-content-cache.test.ts
index d4750439b5..c75169a6b5 100644
--- a/test/review-content-cache.test.ts
+++ b/test/review-content-cache.test.ts
@@ -294,6 +294,101 @@ test("content digest busts when bounded PR check state changes", () => {
   assert.notEqual(passing, failing);
 });
 
+test("content digest ignores duplicate compacted PR check runs", () => {
+  const pull = item({ kind: "pull_request", number: 200 });
+  const notify = {
+    name: "notify",
+    status: "completed",
+    conclusion: "success",
+    app: "github-actions",
+  };
+  const once = itemContentDigestForTest(
+    pull,
+    pullContext({
+      pullChecks: {
+        complete: true,
+        checkRuns: [notify],
+        checkRunsTruncated: false,
+        statuses: [],
+        statusesTruncated: false,
+      },
+    }),
+  );
+  const repeated = itemContentDigestForTest(
+    pull,
+    pullContext({
+      pullChecks: {
+        complete: true,
+        checkRuns: [notify, notify],
+        checkRunsTruncated: false,
+        statuses: [],
+        statusesTruncated: false,
+      },
+    }),
+  );
+
+  assert.equal(once, repeated);
+});
+
+test("content digest keeps check runs that differ only in name or app", () => {
+  const pull = item({ kind: "pull_request", number: 200 });
+  const check = {
+    name: "smoke",
+    status: "completed",
+    conclusion: "success",
+    app: "github-actions",
+  };
+  const digest = (checkRuns) =>
+    itemContentDigestForTest(
+      pull,
+      pullContext({
+        pullChecks: {
+          complete: true,
+          checkRuns,
+          checkRunsTruncated: false,
+          statuses: [],
+          statusesTruncated: false,
+        },
+      }),
+    );
+
+  const alone = digest([check]);
+  const byName = digest([check, { ...check, name: "smoke (windows)" }]);
+  const byApp = digest([check, { ...check, app: "blacksmith-sh" }]);
+
+  assert.notEqual(alone, byName);
+  assert.notEqual(alone, byApp);
+  assert.notEqual(byName, byApp);
+});
+
+test("content digest busts when one of several repeated check runs newly fails", () => {
+  const pull = item({ kind: "pull_request", number: 200 });
+  const notify = {
+    name: "notify",
+    status: "completed",
+    conclusion: "success",
+    app: "github-actions",
+  };
+  const digest = (checkRuns) =>
+    itemContentDigestForTest(
+      pull,
+      pullContext({
+        pullChecks: {
+          complete: true,
+          checkRuns,
+          checkRunsTruncated: false,
+          statuses: [],
+          statusesTruncated: false,
+        },
+      }),
+    );
+
+  const allPassing = digest([notify, notify, notify]);
+  const oneFailing = digest([notify, notify, { ...notify, conclusion: "failure" }]);
+
+  assert.notEqual(allPassing, oneFailing);
+});
+
 test("review comment revision covers comments outside the bounded prompt window", () => {
   const comments = Array.from({ length: 81 }, (_, index) => ({
     id: index + 1,
@@ -353,6 +448,48 @@ test("cache hits when content is unchanged, fresh, complete, and policy matches"
   assert.equal(cacheHit(), true);
 });
 
+test("cache hits after an equivalent check run is repeated on an unchanged head", () => {
+  const pull = item({ kind: "pull_request", number: 200 });
+  const notify = {
+    name: "notify",
+    status: "completed",
+    conclusion: "success",
+    app: "github-actions",
+  };
+  const priorDigest = itemContentDigestForTest(
+    pull,
+    pullContext({
+      pullChecks: {
+        complete: true,
+        checkRuns: [notify],
+        checkRunsTruncated: false,
+        statuses: [],
+        statusesTruncated: false,
+      },
+    }),
+  );
+  const currentDigest = itemContentDigestForTest(
+    pull,
+    pullContext({
+      pullChecks: {
+        complete: true,
+        checkRuns: [notify, notify],
+        checkRunsTruncated: false,
+        statuses: [],
+        statusesTruncated: false,
+      },
+    }),
+  );
+
+  assert.equal(
+    cacheHit({
+      review: freshReview({ contentDigest: priorDigest }),
+      contentDigest: currentDigest,
+    }),
+    true,
+  );
+});
+
 test("cache misses when the content digest differs", () => {
   assert.equal(cacheHit({ contentDigest: "digest-2" }), false);
 });
diff --git a/test/review-semantic-cache.test.ts b/test/review-semantic-cache.test.ts
index 13486796d5..a3bbdac613 100644
--- a/test/review-semantic-cache.test.ts
+++ b/test/review-semantic-cache.test.ts
@@ -1079,6 +1079,22 @@ test("changed discussion, reviews, checks, or target context busts the context d
   }
 });
 
+test("duplicate compacted check runs do not perturb the semantic context digest", () => {
+  const prior = record();
+  const checkRuns = input().context.pullChecks.checkRuns;
+  const repeated = record({
+    context: {
+      pullChecks: {
+        ...input().context.pullChecks,
+        checkRuns: [...checkRuns, ...checkRuns],
+      },
+    },
+  });
+
+  assert.equal(prior.contextDigest, repeated.contextDigest);
+  assert.equal(decision({ priorRecord: prior, currentRecord: repeated }).reason, "hit");
+});
+
 test("head SHA churn alone does not perturb semantic or context digests", () => {
   const prior = record();
   const rebased = record({