diff --git a/src/daemon/spawner.py b/src/daemon/spawner.py
index 8ee8a62..1d45bf2 100644
--- a/src/daemon/spawner.py
+++ b/src/daemon/spawner.py
@@ -1294,6 +1294,22 @@ curl -X POST http://{api_host}:{api_port}/api/projects/{project_id}/tasks/{task_
                         if result["status"] in ("done", "timeout"):
                             result["lock_pid_alive"] = False
                             result["lock_expired"] = True
+                        # running + lock 超时 >30分钟 > 视为 idle,允许 dispatch
+                        elif result["status"] == "running" and result["lock_pid_alive"]:
+                            try:
+                                lock_data = json.loads(lock_path.read_text())
+                                created_at_str = lock_data.get("createdAt", "")
+                                if created_at_str:
+                                    from datetime import datetime as _dt, timezone as _tz
+                                    created_dt = _dt.fromisoformat(created_at_str.replace("Z", "+00:00"))
+                                    elapsed = (_dt.now(_tz.utc) - created_dt).total_seconds()
+                                    if elapsed > 1800:  # 30 minutes
+                                        result["lock_pid_alive"] = False
+                                        result["lock_expired"] = True
+                                        logger.info("Lock expired for %s: running + lock age %.0fs > 1800s",
+                                                    agent_id, elapsed)
+                            except Exception:
+                                pass
                     except Exception:
                         pass