diff --git a/.github/workflows/pr-agent.yml b/.github/workflows/pr-agent.yml
index f1c709fb..18cbf16d 100644
--- a/.github/workflows/pr-agent.yml
+++ b/.github/workflows/pr-agent.yml
@@ -6,12 +6,15 @@ on:
   # 本 workflow 不 checkout / 执行 PR 分支代码，只让 digest-pinned PR-Agent 镜像通过 GitHub API 读取 diff。
   pull_request_target:
     types: [opened, reopened, ready_for_review, synchronize]
+
+  # 允许在 PR 或普通 Issue 里通过评论触发，例如 /ask
   issue_comment:
     types: [created]
 
 jobs:
   pr_agent_job:
-    # PR 与每次新 commit 自动运行；评论触发仍限制为可信成员，避免任意评论滥用 Secrets。
+    # PR 自动运行；
+    # 评论触发时限制为可信成员，允许 PR 评论和普通 Issue 评论使用 /ask。
     if: >-
       ${{
         github.event.sender.type != 'Bot' &&
@@ -19,8 +22,8 @@ jobs:
           github.event_name == 'pull_request_target' ||
           (
             github.event_name == 'issue_comment' &&
-            github.event.issue.pull_request &&
-            contains(fromJson('["OWNER","MEMBER","COLLABORATOR"]'), github.event.comment.author_association)
+            contains(fromJson('["OWNER","MEMBER","COLLABORATOR"]'), github.event.comment.author_association) &&
+            startsWith(github.event.comment.body, '/ask')
           )
         )
       }}
@@ -65,4 +68,4 @@ jobs:
           github_action_config.auto_improve: "false"
 
           # 允许 synchronize 事件触发 PR-Agent
-          github_action_config.pr_actions: '["opened", "reopened", "ready_for_review", "synchronize"]'
+          github_action_config.pr_actions: '["opened", "reopened", "ready_for_review", "synchronize"]'
\ No newline at end of file