diff --git a/scripts/build-worker-artifacts.mjs b/scripts/build-worker-artifacts.mjs
index e55c39d..61d0566 100644
--- a/scripts/build-worker-artifacts.mjs
+++ b/scripts/build-worker-artifacts.mjs
@@ -131,7 +131,10 @@ function sourceCommitFor(dir) {
 function repoHead() {
   try {
     const sha = execSync('git rev-parse HEAD', { cwd: REPO, encoding: 'utf8' }).trim();
-    const dirty = execSync('git status --porcelain', { cwd: REPO, encoding: 'utf8' }).trim();
+    // .worker-builds 是本腳本自己的輸出目錄——它在「寫出成品之前」永遠是 untracked，
+    // 拿它判斷「原始碼乾不乾淨」是假陽性（自己把自己判成髒）。排除掉才是真正的
+    // 「原始碼有沒有未 commit 的變更」。
+    const dirty = execSync('git status --porcelain -- . ":(exclude).worker-builds"', { cwd: REPO, encoding: 'utf8' }).trim();
     return { sha, dirty: !!dirty };
   } catch {
     return { sha: null, dirty: null };