diff --git a/src/api/blackboard_routes.py b/src/api/blackboard_routes.py
index 0235560..028aa44 100644
--- a/src/api/blackboard_routes.py
+++ b/src/api/blackboard_routes.py
@@ -249,6 +249,31 @@ async def update_status(project_id: str, task_id: str, body: Dict[str, Any]):
     return {"ok": True, "old_status": current, "new_status": new_status}
 
 
+# --- @mention 自动提取（#04） ---
+_KNOWN_AGENT_IDS: list = []
+
+def _init_agent_ids():
+    """从配置文件加载 Agent ID 列表"""
+    global _KNOWN_AGENT_IDS
+    if _KNOWN_AGENT_IDS:
+        return
+    try:
+        import yaml
+        cfg_path = os.path.join(os.path.dirname(__file__), "..", "..", "config", "default.yaml")
+        with open(cfg_path) as f:
+            cfg = yaml.safe_load(f)
+        _KNOWN_AGENT_IDS = list(cfg.get("daemon", {}).get("agent_profiles", {}).keys())
+    except Exception:
+        _KNOWN_AGENT_IDS = []
+
+def _extract_mentions(text: str) -> list:
+    """从文本中自动提取 @agent-id 格式的 mention"""
+    import re
+    _init_agent_ids()
+    candidates = set(re.findall(r'@([a-z][a-z0-9]*(?:-[a-z][a-z0-9]*)+)', text))
+    return [a for a in candidates if a in _KNOWN_AGENT_IDS]
+
+
 # --- Comments ---
 
 @router.get("/tasks/{task_id}/comments")