From fbc79c34c9eb05dcefa4618a6863360ec2b46277 Mon Sep 17 00:00:00 2001
From: Allen Hutchison <adh@google.com>
Date: Wed, 18 Jun 2025 11:40:15 -0700
Subject: [PATCH] Fix noise in headless mode on STDOUT (#1184)

---
 packages/cli/src/gemini.tsx                | 2 +-
 packages/cli/src/nonInteractiveCli.ts      | 5 +++++
 packages/cli/src/utils/sandbox.ts          | 1 +
 packages/core/src/utils/gitIgnoreParser.ts | 3 ++-
 4 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/packages/cli/src/gemini.tsx b/packages/cli/src/gemini.tsx
index 148f18bf..d87a8a6a 100644
--- a/packages/cli/src/gemini.tsx
+++ b/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
diff --git a/packages/cli/src/nonInteractiveCli.ts b/packages/cli/src/nonInteractiveCli.ts
index 3efb8452..c5a89575 100644
--- a/packages/cli/src/nonInteractiveCli.ts
+++ b/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)
diff --git a/packages/cli/src/utils/sandbox.ts b/packages/cli/src/utils/sandbox.ts
index 9e9ab1a7..48386357 100644
--- a/packages/cli/src/utils/sandbox.ts
+++ b/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 = [
diff --git a/packages/core/src/utils/gitIgnoreParser.ts b/packages/core/src/utils/gitIgnoreParser.ts
index 69797282..caa11f8b 100644
--- a/packages/core/src/utils/gitIgnoreParser.ts
+++ b/packages/core/src/utils/gitIgnoreParser.ts
@@ -49,7 +49,8 @@ export class GitIgnoreParser implements GitIgnoreFilter {
       .map((p) => p.trim())
       .filter((p) => p !== '' && !p.startsWith('#'));
     if (patterns.length > 0) {
-      console.log(
+      // Log the number of patterns loaded on STDERR so it doesn't clutter the output on STDOUT
+      console.error(
         `Loaded ${patterns.length} patterns from ${patternsFilePath}`,
       );
     }