Fix noise in headless mode on STDOUT (#1184)

packages/cli/src/gemini.tsx

@@ -30,7 +30,6 @@ import {
 export async function main() {
   const workspaceRoot = process.cwd();
   const settings = loadSettings(workspaceRoot);
-  setWindowTitle(basename(workspaceRoot), settings);
 
   await cleanupCheckpoints();
   if (settings.errors.length > 0) {
@@ -84,6 +83,7 @@ export async function main() {
 
   // Render UI, passing necessary config values. Check that there is no command line question.
   if (process.stdin.isTTY && input?.length === 0) {
+    setWindowTitle(basename(workspaceRoot), settings);
     render(
       <React.StrictMode>
         <AppWrapper

packages/cli/src/nonInteractiveCli.ts

@@ -27,6 +27,11 @@ function getResponseText(response: GenerateContentResponse): string | null {
       candidate.content.parts &&
       candidate.content.parts.length > 0
     ) {
+      // We are running in headless mode so we don't need to return thoughts to STDOUT.
+      const thoughtPart = candidate.content.parts[0];
+      if (thoughtPart?.thought) {
+        return null;
+      }
       return candidate.content.parts
         .filter((part) => part.text)
         .map((part) => part.text)

packages/cli/src/utils/sandbox.ts

@@ -203,6 +203,7 @@ export async function start_sandbox(config: SandboxConfig) {
       );
       process.exit(1);
     }
+    // Log on STDERR so it doesn't clutter the output on STDOUT
     console.error(`using macos seatbelt (profile: ${profile}) ...`);
     // if DEBUG is set, convert to --inspect-brk in NODE_OPTIONS
     const args = [