diff --git a/src/daemon/mail_handler.py b/src/daemon/mail_handler.py
index 2221725..d14dadf 100644
--- a/src/daemon/mail_handler.py
+++ b/src/daemon/mail_handler.py
@@ -7,7 +7,7 @@ from __future__ import annotations
 import json
 import logging
 from pathlib import Path
-from typing import Dict, List, Optional
+from typing import Dict, Optional
 
 from src.daemon.base_task_handler import BaseTaskHandler, VerifyResult
 from src.daemon.prompt_composer import PromptComposer, PromptContext
@@ -34,7 +34,7 @@ class MailHandler(BaseTaskHandler):
         composer.add_many(self.get_sections())
         return composer.compose(context)
 
-    def get_sections(self) -> List:
+    def get_sections(self) -> list:
         return [MailContextSection(), MailApiSection(), MailConstraintsSection()]
 
     def verify_completion(self, task_id: str, db_path: Path) -> VerifyResult:
diff --git a/src/daemon/toolchain_handler.py b/src/daemon/toolchain_handler.py
index 16152e1..8e33799 100644
--- a/src/daemon/toolchain_handler.py
+++ b/src/daemon/toolchain_handler.py
@@ -6,9 +6,9 @@ from __future__ import annotations
 
 import json
 import logging
-import subprocess
+import urllib.request
 from pathlib import Path
-from typing import Dict, List
+from typing import Dict
 
 from src.daemon.base_task_handler import BaseTaskHandler, VerifyResult
 from src.daemon.prompt_composer import PromptComposer, PromptContext
@@ -129,7 +129,7 @@ class ToolchainHandler(BaseTaskHandler):
         """auto_working：pending → working"""
         return self._auto_mark_working(task_id, db_path)
 
-    def get_sections(self) -> List:
+    def get_sections(self) -> list:
         """返回 3 个 Toolchain PromptSection 实例"""
         return [
             ToolchainContextSection(),
@@ -176,31 +176,81 @@ class ToolchainHandler(BaseTaskHandler):
         """验证失败 → 标 failed + Mail API 通知主公"""
         self._mark_task_status(db_path, task_id, "failed")
         logger.info("Toolchain %s: verify failed (%s), marked failed", task_id, verify.reason)
-        self._notify_via_mail_api(task_id, verify.reason, verify.evidence)
 
-    def _notify_via_mail_api(self, task_id: str, reason: str, evidence: str) -> None:
-        """通过 Mail API 发通知给主公"""
+        # 从 db 读取事件上下文
+        event_type = ""
+        event_data: Dict = {}
+        try:
+            conn = get_connection(db_path)
+            row = conn.execute(
+                "SELECT must_haves FROM tasks WHERE id=?", (task_id,)
+            ).fetchone()
+            if row and row["must_haves"]:
+                meta = json.loads(row["must_haves"])
+                event_type = meta.get("event_type", "")
+                raw = meta.get("event_data", "{}")
+                event_data = json.loads(raw) if isinstance(raw, str) else raw
+            conn.close()
+        except Exception:
+            pass
+
+        self._notify_via_mail_api(
+            task_id, verify.reason, verify.evidence,
+            event_type, event_data,
+        )
+
+    def _notify_via_mail_api(
+        self,
+        task_id: str,
+        reason: str,
+        evidence: str,
+        event_type: str,
+        event_data: Dict,
+    ) -> None:
+        """通过 Mail API 发送丰富的失败通知给主公。"""
+        # 构建行动指引
+        action_hint = "请检查黑板任务并手动处理。"
+        et_lower = event_type.lower()
+        if "ci" in et_lower or "deploy" in et_lower:
+            action_hint = "建议创建任务派给 jiangwei-infra 检查 CI/部署问题。"
+        elif "review" in et_lower:
+            action_hint = "建议查看 PR review 状态，必要时通知相关开发者。"
+        elif "issue" in et_lower:
+            action_hint = "建议创建任务派给对应开发者处理 Issue。"
+
+        # 构建事件详情
+        event_details = ""
+        if event_data:
+            event_details = "\n".join(
+                f"  - {k}: {v}" for k, v in event_data.items()
+            )
+
+        title = f"[toolchain-handler] 工具链事件处理失败: {task_id}"
+        text = (
+            f"任务 {task_id} 验证失败\n\n"
+            f"事件类型: {event_type or '未知'}\n"
+            f"事件详情:\n{event_details or '  (无)'}\n\n"
+            f"失败原因: {reason}\n"
+            f"证据: {evidence}\n\n"
+            f"黑板任务: http://localhost:8083/ → 项目 _toolchain → 任务 {task_id}\n\n"
+            f"行动指引: {action_hint}"
+        )
+
         payload = json.dumps({
             "from": "daemon",
             "to": "pangtong-fujunshi",
-            "title": f"工具链事件处理失败: {task_id}",
-            "text": (
-                f"任务 {task_id} 验证失败: {reason}\n"
-                f"证据: {evidence}\n\n请人工检查。"
-            ),
+            "title": title,
+            "text": text,
             "type": "inform",
-        }, ensure_ascii=False)
+        }, ensure_ascii=False).encode("utf-8")
+
         try:
-            subprocess.run(
-                [
-                    "curl", "-s", "-X", "POST",
-                    "http://localhost:8083/api/mail",
-                    "-H", "Content-Type: application/json",
-                    "-d", payload,
-                ],
-                timeout=5,
-                capture_output=True,
+            req = urllib.request.Request(
+                "http://localhost:8083/api/mail",
+                data=payload,
+                headers={"Content-Type": "application/json"},
             )
-            logger.info("Toolchain %s: sent failure notification to pangtong-fujunshi via Mail API", task_id)
+            urllib.request.urlopen(req, timeout=5)
+            logger.info("Toolchain %s: sent failure notification via Mail API", task_id)
         except Exception as e:
             logger.warning("Toolchain %s: failed to notify via Mail API: %s", task_id, e)