diff --git a/actions/setup/js/create_pull_request.test.cjs b/actions/setup/js/create_pull_request.test.cjs
index c9ee905a6ff..fee0b962b2a 100644
--- a/actions/setup/js/create_pull_request.test.cjs
+++ b/actions/setup/js/create_pull_request.test.cjs
@@ -14,22 +14,31 @@ const { getBundlePathForBranch, getBundlePathForBranchInRepo } = require("./gene
 // The privileged handler derives patch/bundle paths from `branch` (and `repo`)
 // via resolveTransportPaths, so tests must write transport files at the
 // canonical derived location and let the handler discover them.
+//
+// `/tmp/gh-aw` is a process-global path shared by every test file. Vitest runs
+// test files in parallel processes, so a cleanup that globbed the whole
+// directory would delete another file's in-flight transport files mid-test.
+// Track only the paths this file created and delete just those.
+const createdTransportPaths = new Set();
 function canonicalPatchPath(branch, repo) {
   fs.mkdirSync("/tmp/gh-aw", { recursive: true });
-  return repo ? getPatchPathForBranchInRepo(branch, repo) : getPatchPathForBranch(branch);
+  const p = repo ? getPatchPathForBranchInRepo(branch, repo) : getPatchPathForBranch(branch);
+  createdTransportPaths.add(p);
+  return p;
 }
 function canonicalBundlePath(branch, repo) {
   fs.mkdirSync("/tmp/gh-aw", { recursive: true });
-  return repo ? getBundlePathForBranchInRepo(branch, repo) : getBundlePathForBranch(branch);
+  const p = repo ? getBundlePathForBranchInRepo(branch, repo) : getBundlePathForBranch(branch);
+  createdTransportPaths.add(p);
+  return p;
 }
 function cleanupCanonicalTransports() {
-  try {
-    for (const f of fs.readdirSync("/tmp/gh-aw")) {
-      if (/^aw-.*\.(patch|bundle)$/.test(f)) {
-        fs.rmSync(`/tmp/gh-aw/${f}`, { force: true });
-      }
-    }
-  } catch {}
+  for (const p of createdTransportPaths) {
+    try {
+      fs.rmSync(p, { force: true });
+    } catch {}
+  }
+  createdTransportPaths.clear();
 }
 
 beforeEach(() => {
diff --git a/actions/setup/js/handle_noop_message.test.cjs b/actions/setup/js/handle_noop_message.test.cjs
index c6adf5de507..5f21d0a07e6 100644
--- a/actions/setup/js/handle_noop_message.test.cjs
+++ b/actions/setup/js/handle_noop_message.test.cjs
@@ -20,6 +20,12 @@ describe("handle_noop_message", () => {
     // Create temp directory for test files
     tempDir = fs.mkdtempSync(path.join(os.tmpdir(), "handle-noop-test-"));
 
+    // getPromptPath() throws unless GH_AW_PROMPTS_DIR or RUNNER_TEMP is set.
+    // On CI RUNNER_TEMP is ambient, but it is not set in local dev, so set the
+    // prompts dir explicitly to make the suite environment-independent. The
+    // actual path is irrelevant because fs.readFileSync is mocked below.
+    process.env.GH_AW_PROMPTS_DIR = tempDir;
+
     // Mock fs.readFileSync to return template content
     originalReadFileSync = fs.readFileSync;
     fs.readFileSync = vi.fn((filePath, encoding) => {
diff --git a/actions/setup/js/push_to_pull_request_branch.test.cjs b/actions/setup/js/push_to_pull_request_branch.test.cjs
index 7eaaa380acc..30245d667b9 100644
--- a/actions/setup/js/push_to_pull_request_branch.test.cjs
+++ b/actions/setup/js/push_to_pull_request_branch.test.cjs
@@ -9,22 +9,31 @@ const { getBundlePathForBranch, getBundlePathForBranchInRepo } = require("./gene
 // The privileged handler derives patch/bundle paths from `branch` (and `repo`)
 // via resolveTransportPaths, so tests must write transport files at the
 // canonical derived location and let the handler discover them.
+//
+// `/tmp/gh-aw` is a process-global path shared by every test file. Vitest runs
+// test files in parallel processes, so a cleanup that globbed the whole
+// directory would delete another file's in-flight transport files mid-test.
+// Track only the paths this file created and delete just those.
+const createdTransportPaths = new Set();
 function canonicalPatchPath(branch, repo) {
   fs.mkdirSync("/tmp/gh-aw", { recursive: true });
-  return repo ? getPatchPathForBranchInRepo(branch, repo) : getPatchPathForBranch(branch);
+  const p = repo ? getPatchPathForBranchInRepo(branch, repo) : getPatchPathForBranch(branch);
+  createdTransportPaths.add(p);
+  return p;
 }
 function canonicalBundlePath(branch, repo) {
   fs.mkdirSync("/tmp/gh-aw", { recursive: true });
-  return repo ? getBundlePathForBranchInRepo(branch, repo) : getBundlePathForBranch(branch);
+  const p = repo ? getBundlePathForBranchInRepo(branch, repo) : getBundlePathForBranch(branch);
+  createdTransportPaths.add(p);
+  return p;
 }
 function cleanupCanonicalTransports() {
-  try {
-    for (const f of fs.readdirSync("/tmp/gh-aw")) {
-      if (/^aw-.*\.(patch|bundle)$/.test(f)) {
-        fs.rmSync(`/tmp/gh-aw/${f}`, { force: true });
-      }
-    }
-  } catch {}
+  for (const p of createdTransportPaths) {
+    try {
+      fs.rmSync(p, { force: true });
+    } catch {}
+  }
+  createdTransportPaths.clear();
 }
 
 beforeEach(() => {