diff --git a/src/daemon/ticker.py b/src/daemon/ticker.py
index 84f3a0f..d8e927c 100644
--- a/src/daemon/ticker.py
+++ b/src/daemon/ticker.py
@@ -610,22 +610,21 @@ class Ticker:
 
         spawned = []
         for agent_id in idle_agents:
-            if not await self.counter.can_acquire(agent_id):
-                continue
+            # v2.7.2: counter 检查在 spawn_full_agent 内部
             prompt = self._build_claim_prompt(agent_id, broadcastable, project_id)
             try:
-                await self.counter.acquire(agent_id)
                 session_id = await self.spawner.spawn_full_agent(
                     agent_id=agent_id,
                     message=prompt,
-                    on_complete=lambda aid, _: self.counter.release(aid),
+                    # v2.7.2: on_complete 不含 counter.release，由 wrapped_on_complete 保证
                     task_id=broadcastable[0].id if broadcastable else None,
                     task_db_path=db_path,
                 )
                 spawned.append(agent_id)
                 logger.info("Broadcast spawned %s (session=%s)", agent_id, session_id)
+            except AgentBusyError:
+                logger.debug("Broadcast skip %s: busy", agent_id)
             except Exception:
-                self.counter.release(agent_id)
                 logger.exception("Broadcast spawn failed for %s", agent_id)
 
         return task_ids if spawned else []