diff --git a/app/gitea.js b/app/gitea.js
index 1a5c849..3d7bfe2 100644
--- a/app/gitea.js
+++ b/app/gitea.js
@@ -6,6 +6,13 @@ const httpsAgent = GITEA_SKIP_TLS_VERIFY ? new https.Agent({ rejectUnauthorized:
 const headers = () => ({ Authorization: `token ${GITEA_TOKEN}`, 'Content-Type': 'application/json' });
 const api = (path) => `${GITEA_SERVER_URL.replace(/\/$/, '')}/api/v1${path}`;
 
+function extractCommitMessage(payload) {
+  return payload?.message
+    || payload?.commit?.message
+    || payload?.commit?.commit?.message
+    || '';
+}
+
 /**
  * 取得 PR 的 Git Diff 內容，已自動排除 .gitea/ 資料夾。
  */
@@ -33,7 +40,9 @@ export async function getCommitMessageBySha(sha) {
       timeout: 30000,
       httpsAgent,
     });
-    return resp.data?.message || '';
+    const message = extractCommitMessage(resp.data);
+    console.log(`  🔎 bot-check: commit api sha=${sha} keys=${Object.keys(resp.data || {}).join(',') || 'empty'} message=${message ? 'found' : 'empty'}`);
+    return message;
   } catch (e) {
     console.log(`  ⚠️  bot-check: 讀取 commit sha=${sha} 失敗: ${e.message}`);
     return '';
@@ -49,6 +58,7 @@ export async function getBranchHeadCommitMessage(branch = PR_HEAD_BRANCH) {
       httpsAgent,
     });
     const sha = resp.data?.commit?.id || resp.data?.commit?.sha || '';
+    console.log(`  🔎 bot-check: branch api branch=${branch} keys=${Object.keys(resp.data || {}).join(',') || 'empty'} sha=${sha || 'empty'} message=${extractCommitMessage(resp.data?.commit) ? 'found' : 'empty'}`);
     return await getCommitMessageBySha(sha);
   } catch (e) {
     console.log(`  ⚠️  bot-check: 讀取 branch=${branch} head commit 失敗: ${e.message}`);
@@ -57,7 +67,7 @@ export async function getBranchHeadCommitMessage(branch = PR_HEAD_BRANCH) {
 }
 
 export async function shouldSkipBotCommit({ sha = PR_HEAD_SHA || process.env.GITHUB_SHA, branch = PR_HEAD_BRANCH } = {}) {
-  console.log(`  🔎 bot-check: start sha=${sha || 'empty'} branch=${branch || 'empty'}`);
+  console.log(`  🔎 bot-check: start PR_HEAD_SHA=${PR_HEAD_SHA || 'empty'} GITHUB_SHA=${process.env.GITHUB_SHA || 'empty'} sha=${sha || 'empty'} branch=${branch || 'empty'}`);
 
   const shaMessage = await getCommitMessageBySha(sha);
   if (sha) {