diff --git a/src/daemon/ticker.py b/src/daemon/ticker.py
index 68819fa..2777c96 100644
--- a/src/daemon/ticker.py
+++ b/src/daemon/ticker.py
@@ -603,11 +603,15 @@ Project ID: {project_id}
                     processed.append(agent_id)
                     logger.info("Mention spawn success: %s (%d mentions)", agent_id, len(items))
                 else:
-                    # spawn 失败 → 递增 retry_count
+                    # spawn 返回 None（其他原因）→ 递增 retry_count
                     for item in items:
                         bb.mark_mention_retry(item["id"])
                     logger.warning("Mention spawn failed: %s, retrying next tick", agent_id)
 
+            except AgentBusyError:
+                # Agent 忙，不递增 retry_count，等下次 tick 自然重试
+                logger.info("Mention spawn skipped: %s busy, will retry next tick", agent_id)
+
             except Exception as e:
                 logger.exception("Mention processing error for agent %s", agent_id)
                 for item in items: