diff --git a/src/daemon/spawner.py b/src/daemon/spawner.py
index 9fba9a3..fd7392c 100644
--- a/src/daemon/spawner.py
+++ b/src/daemon/spawner.py
@@ -280,6 +280,38 @@ curl -X POST http://{self.api_host}:{self.api_port}/api/projects/{project_id}/ta
 成功：status → {success_status} | 失败：status → "failed"
 """
 
+    def _build_mail_prompt(self, task_id: str, title: str, description: str,
+                            must_haves: str, agent_id: str) -> str:
+        """构建 Mail 专用精简模板"""
+        # 解析 must_haves 获取 from 和 performative
+        from_agent = agent_id
+        performative = "request"
+        try:
+            meta = json.loads(must_haves) if must_haves else {}
+            from_agent = meta.get("from", agent_id)
+            performative = meta.get("performative", meta.get("type", "request"))
+        except Exception:
+            pass
+
+        # 截断 title 和 text 用于模板安全
+        safe_title = (title or "").replace('"', '\\"')[:100]
+        safe_text = (description or "").replace('"', '\\"')
+
+        common_kwargs = dict(
+            from_agent=from_agent,
+            title=safe_title,
+            text=safe_text,
+            task_id=task_id,
+            agent_id=agent_id,
+            api_host=self.api_host,
+            api_port=self.api_port,
+        )
+
+        if performative == "inform":
+            return MAIL_INFORM_TEMPLATE.format(**common_kwargs)
+        else:
+            return MAIL_REQUEST_TEMPLATE.format(**common_kwargs)
+
     async def spawn_full_agent(
         self,
         agent_id: str,