ci(evals): only run evals if prompts or tools changed

scripts/check_evals_trigger.js

@@ -0,0 +1,40 @@
+/**
+ * @license
+ * Copyright 2026 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+import { execSync } from 'node:child_process';
+
+function main() {
+  try {
+    // Fetch main branch to compare against. Use || true to avoid failing if already up to date or no remote.
+    execSync('git fetch https://github.com/google-gemini/gemini-cli.git main', {
+      stdio: 'ignore',
+    });
+
+    // Find the merge base with main
+    const mergeBase = execSync('git merge-base HEAD FETCH_HEAD', {
+      encoding: 'utf-8',
+    }).trim();
+
+    // Get changed files
+    const changedFiles = execSync(`git diff --name-only ${mergeBase} HEAD`, {
+      encoding: 'utf-8',
+    })
+      .split('\n')
+      .filter(Boolean);
+
+    const shouldRun = changedFiles.some(
+      (file) =>
+        file.startsWith('packages/core/src/prompts/') ||
+        file.startsWith('packages/core/src/tools/'),
+    );
+
+    console.log(shouldRun ? 'true' : 'false');
+  } catch (_error) {
+    // If anything fails (e.g., no git history), run evals to be safe
+    console.log('true');
+  }
+}
+
+main();