diff --git a/src/status-watcher.js b/src/status-watcher.js
index 2f953a3..8ed1732 100644
--- a/src/status-watcher.js
+++ b/src/status-watcher.js
@@ -379,6 +379,21 @@ class StatusWatcher extends EventEmitter {
       return;
     }
 
+    // OpenClaw cache-ttl custom record: reliable "turn complete" signal.
+    // Emitted after every assistant turn. Use it to fast-idle the session
+    // instead of waiting the full IDLE_TIMEOUT_S.
+    if (record.type === 'custom' && record.customType === 'openclaw.cache-ttl') {
+      if (state.pendingToolCalls === 0) {
+        // Turn is done — fast-idle: fire idle check after a short grace period (3s)
+        // to allow any trailing writes to flush before marking complete.
+        if (state.idleTimer) clearTimeout(state.idleTimer);
+        state.idleTimer = setTimeout(() => {
+          this._checkIdle(sessionKey);
+        }, 3000);
+      }
+      return;
+    }
+
     // Legacy format fallback (for compatibility)
     var legacyType = record.type;