diff --git a/src/blackboard/operations.py b/src/blackboard/operations.py
index de4ce20..2d75f3e 100644
--- a/src/blackboard/operations.py
+++ b/src/blackboard/operations.py
@@ -935,3 +935,85 @@ class Blackboard:
             return row["round_count"] if row else 0
         finally:
             conn.close()
+
+    # ===================================================================
+    # Mention Queue (v2.9 #01)
+    # ===================================================================
+
+    def record_mentions(self, comment_id: int, task_id: str,
+                        mentioned_agents: List[str]) -> int:
+        """写入 mention_queue 记录（comment 创建时调用）"""
+        if not mentioned_agents:
+            return 0
+        conn = self._conn()
+        try:
+            conn.execute("BEGIN IMMEDIATE")
+            count = 0
+            for agent_id in mentioned_agents:
+                exists = conn.execute(
+                    "SELECT id FROM mention_queue WHERE comment_id=? AND mentioned_agent=?",
+                    (comment_id, agent_id)
+                ).fetchone()
+                if not exists:
+                    conn.execute(
+                        "INSERT INTO mention_queue (comment_id, task_id, mentioned_agent, status) "
+                        "VALUES (?,?,?,'pending')",
+                        (comment_id, task_id, agent_id)
+                    )
+                    count += 1
+            conn.commit()
+            return count
+        finally:
+            conn.close()
+
+    def get_pending_mentions(self, max_retries: int = 5) -> List[Dict[str, Any]]:
+        """获取所有 pending 且未超过重试上限的 mentions"""
+        conn = self._conn()
+        try:
+            rows = conn.execute(
+                """SELECT mq.*, c.body as comment_body, c.author as comment_author
+                   FROM mention_queue mq
+                   JOIN comments c ON mq.comment_id = c.id
+                   WHERE mq.status = 'pending' AND mq.retry_count < ?
+                   ORDER BY mq.created_at ASC""",
+                (max_retries,)
+            ).fetchall()
+            return [dict(r) for r in rows]
+        finally:
+            conn.close()
+
+    def mark_mention_notified(self, mention_id: int) -> bool:
+        """标记 mention 为已通知"""
+        conn = self._conn()
+        try:
+            conn.execute("BEGIN IMMEDIATE")
+            conn.execute(
+                "UPDATE mention_queue SET status='notified', notified_at=datetime('now') WHERE id=?",
+                (mention_id,)
+            )
+            conn.commit()
+            return True
+        finally:
+            conn.close()
+
+    def mark_mention_retry(self, mention_id: int) -> bool:
+        """递增 mention 重试计数"""
+        conn = self._conn()
+        try:
+            conn.execute("BEGIN IMMEDIATE")
+            conn.execute("UPDATE mention_queue SET retry_count=retry_count+1 WHERE id=?", (mention_id,))
+            conn.commit()
+            return True
+        finally:
+            conn.close()
+
+    def mark_mention_failed(self, mention_id: int) -> bool:
+        """标记 mention 为失败（超过重试上限）"""
+        conn = self._conn()
+        try:
+            conn.execute("BEGIN IMMEDIATE")
+            conn.execute("UPDATE mention_queue SET status='failed' WHERE id=?", (mention_id,))
+            conn.commit()
+            return True
+        finally:
+            conn.close()