diff --git a/.github/actions/claude-pr-review/action.yml b/.github/actions/claude-pr-review/action.yml
index c6509f9..be537f8 100644
--- a/.github/actions/claude-pr-review/action.yml
+++ b/.github/actions/claude-pr-review/action.yml
@@ -214,6 +214,10 @@ runs:
              (`open` or `resolved`) for each finding you assessed. An omitted finding
              remains open; only an explicit `resolved` disposition closes one. Never
              resolve human-authored threads.
+             Disposition only findings whose manifest `status` is `open`. A finding
+             already carrying another status was closed outside this round; it appears
+             in the manifest as context so you do not re-raise it, and a disposition
+             for it is ignored.
              Do the same for every open manifest question: return a prior_questions
              disposition (`open`, `answered`, or `withdrawn`) with a one-line reason.
              An omitted question stays open. Disposition each question from the whole
diff --git a/.github/actions/claude-pr-review/review_pipeline.py b/.github/actions/claude-pr-review/review_pipeline.py
index 1c8f090..819b764 100644
--- a/.github/actions/claude-pr-review/review_pipeline.py
+++ b/.github/actions/claude-pr-review/review_pipeline.py
@@ -1543,10 +1543,10 @@ def compile_review(
         }
     model_output = validate_model_output(model_output)
 
-    expected_prior_ids = {
+    known_prior_ids = {
         item_id
         for item_id, item in manifest["findings"].items()
-        if isinstance(item, dict) and item.get("status") == "open"
+        if isinstance(item, dict)
     }
     returned_prior_ids = [
         str(item.get("finding_id") or "")
@@ -1558,10 +1558,10 @@ def compile_review(
             "prior_findings contains duplicate finding IDs",
             code="PRIOR_FINDING_INVALID",
         )
-    unknown = sorted(set(returned_prior_ids) - expected_prior_ids)
+    unknown = sorted(set(returned_prior_ids) - known_prior_ids)
     if unknown:
         raise PipelineError(
-            "prior_findings references findings that are not open "
+            "prior_findings references findings that are not in the manifest "
             f"(unknown={unknown})",
             code="PRIOR_FINDING_INVALID",
         )
@@ -1598,6 +1598,20 @@ def compile_review(
                 f"prior_findings has invalid disposition for {item_id}",
                 code="PRIOR_FINDING_INVALID",
             )
+        if (
+            item.get("status") == "resolved"
+            and item.get("thread_resolution") == "confirmed"
+        ):
+            # Someone resolved the thread on GitHub between rounds, so prepare
+            # already closed this finding. That human action is authoritative:
+            # a concordant `resolved` is a no-op, and an `open` must not reopen
+            # a thread a reviewer deliberately closed.
+            print(
+                f"ignoring {status} disposition for {item_id}: already "
+                "resolved on GitHub",
+                file=sys.stderr,
+            )
+            continue
         item["status"] = status
         item["last_checked_sha"] = head
         if status == "resolved":
diff --git a/.github/actions/claude-pr-review/test_review_pipeline.py b/.github/actions/claude-pr-review/test_review_pipeline.py
index 2aab686..b991e89 100644
--- a/.github/actions/claude-pr-review/test_review_pipeline.py
+++ b/.github/actions/claude-pr-review/test_review_pipeline.py
@@ -1000,10 +1000,62 @@ def test_unknown_prior_finding_still_fails(self):
 
         with self.assertRaisesRegex(
             pipeline.PipelineError,
-            "not open",
+            "not in the manifest",
         ):
             pipeline.compile_review(review_input(), output)
 
+    def test_disposition_for_externally_resolved_finding_is_tolerated(self):
+        value = review_input()
+        value["thread_resolution_enabled"] = True
+        value["manifest"]["findings"]["F-existing"] = {
+            "status": "resolved",
+            "severity": "major",
+            "thread_id": "THREAD",
+            "thread_resolution": "confirmed",
+            "resolved_sha": "a" * 40,
+        }
+        output = clean_output()
+        output["prior_findings"] = [
+            {
+                "finding_id": "F-existing",
+                "disposition": "resolved",
+                "reason": "The head commit applies the requested change.",
+            }
+        ]
+
+        payload = pipeline.compile_review(value, output)
+
+        item = payload["manifest"]["findings"]["F-existing"]
+        self.assertEqual(item["status"], "resolved")
+        self.assertEqual(item["thread_resolution"], "confirmed")
+        self.assertEqual(payload["resolve_thread_ids"], [])
+
+    def test_open_disposition_cannot_reopen_externally_resolved_finding(self):
+        value = review_input()
+        value["thread_resolution_enabled"] = True
+        value["manifest"]["findings"]["F-existing"] = {
+            "status": "resolved",
+            "severity": "major",
+            "thread_id": "THREAD",
+            "thread_resolution": "confirmed",
+            "resolved_sha": "a" * 40,
+        }
+        output = clean_output()
+        output["prior_findings"] = [
+            {
+                "finding_id": "F-existing",
+                "disposition": "open",
+                "reason": "The issue looks unaddressed.",
+            }
+        ]
+
+        payload = pipeline.compile_review(value, output)
+
+        item = payload["manifest"]["findings"]["F-existing"]
+        self.assertEqual(item["status"], "resolved")
+        self.assertEqual(item["thread_resolution"], "confirmed")
+        self.assertEqual(item["resolved_sha"], "a" * 40)
+
     def test_skip_with_open_finding_preserves_manifest(self):
         value = review_input(mode="skip")
         value["manifest"]["findings"]["F-existing"] = {