diff --git a/.claude/skills/replay-eval/scripts/test_run_replay.py b/.claude/skills/replay-eval/scripts/test_run_replay.py
index 003cdeb..c79b1d3 100644
--- a/.claude/skills/replay-eval/scripts/test_run_replay.py
+++ b/.claude/skills/replay-eval/scripts/test_run_replay.py
@@ -4,6 +4,7 @@
 from __future__ import annotations
 
 import json
+import os
 import pathlib
 import sys
 import tempfile
@@ -87,6 +88,34 @@ class ReplayRunTest(unittest.TestCase):
         self.assertNotIn('"prompt":', report)
         self.assertNotIn('"payload":', report)
 
+    def test_execute_uses_external_planner_and_validates_each_candidate(self):
+        candidate = {
+            "targetChapter": 489,
+            "chapterGoal": "机制 smoke",
+            "keyEvents": [],
+            "entities": [],
+            "foreshadowing": [],
+            "stateChanges": [],
+            "hook": "下一步",
+            "unknowns": [],
+            "assumptions": [],
+        }
+        with tempfile.TemporaryDirectory() as directory:
+            fake = pathlib.Path(directory) / "fake-planner.py"
+            fake.write_text(
+                "#!/usr/bin/env python3\n"
+                "import json\n"
+                f"print(json.dumps({{'result': json.dumps({candidate!r}, ensure_ascii=False)}}))\n",
+                encoding="utf-8",
+            )
+            os.chmod(fake, 0o755)
+            output_dir = pathlib.Path(directory) / "run"
+            result = run_replay(config(), output_dir, mode="execute", planner_bin=str(fake))
+            self.assertTrue(result["ok"])
+            self.assertEqual(result["status"], "completed")
+            self.assertEqual(set(result["results"]), {"outline_only", "outline_plus_cards", "outline_plus_placebo_cards"})
+            self.assertTrue(list(output_dir.glob("candidate_*.json")))
+
 
 if __name__ == "__main__":
     unittest.main()