diff --git a/src/daemon/spawner.py b/src/daemon/spawner.py
index 07c445e..5266272 100644
--- a/src/daemon/spawner.py
+++ b/src/daemon/spawner.py
@@ -345,6 +345,23 @@ 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_discussion_prompt(self, task_id: str, title: str,
+                                  description: str, must_haves: str,
+                                  project_id: str, agent_id: str) -> str:
+        """构建讨论类 spawn prompt（§3.3 框架 + Boids）"""
+        goal_snapshot = description or title
+        constraints = must_haves or "（无特殊约束）"
+
+        return DISCUSSION_PROMPT_TEMPLATE.format(
+            goal_snapshot=goal_snapshot,
+            constraints=constraints,
+            project_id=project_id,
+            task_id=task_id,
+            agent_id=agent_id,
+            api_host=self.api_host,
+            api_port=self.api_port,
+        )
+
     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"""