diff --git a/src/api/toolchain_routes.py b/src/api/toolchain_routes.py
index 930efb5..774af5b 100644
--- a/src/api/toolchain_routes.py
+++ b/src/api/toolchain_routes.py
@@ -372,6 +372,12 @@ async def _handle_issue_comment(payload: Dict[str, Any]) -> None:
     if not issue or not isinstance(issue, dict):
         logger.warning("issue_comment event missing issue field, skipping")
         return
+
+    # 已关闭的 Issue/PR 不再发送 CI 失败通知
+    if issue.get("state") == "closed":
+        logger.debug("Skipping CI failure notification for closed issue #%s", issue.get("number"))
+        return
+
     repo = _repo_fullname(payload)
     issue_number = issue.get("number", 0)