diff --git a/src/api/toolchain_routes.py b/src/api/toolchain_routes.py
index f56586b..7222970 100644
--- a/src/api/toolchain_routes.py
+++ b/src/api/toolchain_routes.py
@@ -219,7 +219,7 @@ def _toolchain_db_path() -> Path:
 
 
 def _send_toolchain_task(
-    to_agent: str,
+    to_agent: str | None,
     title: str,
     description: str,
     event_type: str,
@@ -231,7 +231,7 @@ def _send_toolchain_task(
     """创建 Toolchain Task 并写入 _toolchain DB。
 
     Args:
-        to_agent: 收件人 Agent ID
+        to_agent: 收件人 Agent ID，None 表示无指派（待路由/delegate）
         title: 任务标题
         description: 任务描述（模板渲染后的事件信息）
         event_type: 事件类型（review_result / ci_failure / ...）
@@ -243,7 +243,7 @@ def _send_toolchain_task(
     Returns:
         创建的 Task ID
     """
-    if to_agent not in AGENT_IDS:
+    if to_agent is not None and to_agent not in AGENT_IDS:
         logger.warning("Unknown agent: %s, skipping toolchain task", to_agent)
         return ""
 
@@ -1106,6 +1106,44 @@ async def _handle_issues(payload: Dict[str, Any]) -> None:
         )
 
     elif action == "opened":
+        # §11b: 无 assignee 的普通 Issue → discussion task
+        assignees = issue.get("assignees") or []
+        single_assignee = issue.get("assignee")
+        if single_assignee and isinstance(single_assignee, dict) and single_assignee not in assignees:
+            assignees = list(assignees) + [single_assignee]
+
+        if not assignees and not ("部署失败" in issue_title):
+            # 无 assignee + 非部署失败 → 检查是否有 type/* label
+            labels_list_opened = [
+                lbl.get("name", "") for lbl in (issue.get("labels") or [])
+            ]
+            has_type_label = any(
+                lbl.lower().startswith("type/") for lbl in labels_list_opened
+            )
+            if has_type_label:
+                issue_body = issue.get("body", "") or "(无描述)"
+                title_discussion = f"Issue 讨论: {issue_title} ({repo}#{issue_number})"
+                _send_toolchain_task(
+                    to_agent=None,  # 无指派 → router delegate 庞统
+                    title=title_discussion,
+                    description=f"## Issue 需要讨论\n\n"
+                                f"**{repo}#{issue_number}**: {issue_title}\n\n"
+                                f"{issue_body}",
+                    event_type="issue_discussion",
+                    action_type="issue_discussion",
+                    steps=[],  # discussion 不需要结构化步骤
+                    context_data={
+                        "issue_number": issue_number,
+                        "repo": repo,
+                        "issue_title": issue_title,
+                        "issue_body": issue_body,
+                    },
+                )
+                logger.info(
+                    "Issue #%s: no assignee + type label → discussion task",
+                    issue_number)
+                # discussion task 创建后继续检查 @mention（不 return）
+
         if "部署失败" in issue_title:
             # 从 Issue body 提取 commit hash（Gitea deploy workflow 格式）
             sha_match = re.search(r'[0-9a-f]{40}', issue.get("body", ""))
diff --git a/src/daemon/toolchain_handler.py b/src/daemon/toolchain_handler.py
index 24a0057..075e5fe 100644
--- a/src/daemon/toolchain_handler.py
+++ b/src/daemon/toolchain_handler.py
@@ -34,6 +34,8 @@ _ACTION_HINTS: Dict[str, str] = {
     "review_comment": "你收到一个 Review 评论,这是一个需要你查看并响应的事件。",
     "ci_failure": "你收到一个 CI 失败通知,这是一个需要你修复失败测试的事件。",
     "issue_assigned": "你收到一个 Issue 指派,这是一个需要你编码实现的事件。",
+    "issue_closed": "你收到一个 Issue 关闭通知。这是一条纯通知,阅读即可。",
+    "issue_discussion": "你收到一个需要讨论的 Issue。请阅读 Issue 内容,发起讨论并引导其他 agent 参与。",
     "deploy_failure": "你收到一个部署失败通知,这是一个需要你排查并修复的事件。",
     "mention": "你收到一个 @mention 通知,这是一个需要你按指引响应的事件。",
     "review_merged": "你收到一个 PR 合并通知。这是一条纯通知,阅读即可。",
@@ -336,6 +338,11 @@ class ToolchainHandler(BaseTaskHandler):
                         return VerifyResult(True, "issue_closed_passthrough",
                                             "issue_closed auto-pass")
 
+                    # 特殊处理:issue_discussion 始终通过(触发 delegate 庞统 §21 §11b)
+                    if meta.get("action_type") == "issue_discussion":
+                        return VerifyResult(True, "discussion_passthrough",
+                                            "issue_discussion auto-pass")
+
                 # 1. 优先检查 action_report comment
                 report_row = conn.execute(
                     "SELECT id FROM comments WHERE task_id=? "