refactor(stdio): always patch stdout and use createWorkingStdio for clean output

packages/cli/src/gemini.test.tsx

@@ -50,7 +50,7 @@ vi.mock('@google/gemini-cli-core', async (importOriginal) => {
       ),
     ),
     patchStdio: vi.fn(() => () => {}),
-    createInkStdio: vi.fn(() => ({
+    createWorkingStdio: vi.fn(() => ({
       stdout: {
         write: vi.fn((...args) =>
           process.stdout.write(

packages/cli/src/gemini.tsx

@@ -47,7 +47,7 @@ import {
   recordSlowRender,
   coreEvents,
   CoreEvent,
-  createInkStdio,
+  createWorkingStdio,
   patchStdio,
   writeToStdout,
   writeToStderr,
@@ -203,7 +203,7 @@ export async function startInteractiveUI(
   consolePatcher.patch();
   registerCleanup(consolePatcher.cleanup);
 
-  const { stdout: inkStdout, stderr: inkStderr } = createInkStdio();
+  const { stdout: inkStdout, stderr: inkStderr } = createWorkingStdio();
 
   // Create wrapper component to use hooks inside render
   const AppWrapper = () => {

packages/cli/src/gemini_cleanup.test.tsx

@@ -24,7 +24,7 @@ vi.mock('@google/gemini-cli-core', async (importOriginal) => {
     ...actual,
     writeToStdout: vi.fn(),
     patchStdio: vi.fn(() => () => {}),
-    createInkStdio: vi.fn(() => ({
+    createWorkingStdio: vi.fn(() => ({
       stdout: {
         write: vi.fn(),
         columns: 80,

packages/cli/src/nonInteractiveCli.test.ts

@@ -68,6 +68,10 @@ vi.mock('@google/gemini-cli-core', async (importOriginal) => {
       getMetrics: vi.fn(),
     },
     coreEvents: mockCoreEvents,
+    createWorkingStdio: vi.fn(() => ({
+      stdout: process.stdout,
+      stderr: process.stderr,
+    })),
   };
 });
 

packages/cli/src/nonInteractiveCli.ts

@@ -28,6 +28,7 @@ import {
   debugLogger,
   coreEvents,
   CoreEvent,
+  createWorkingStdio,
 } from '@google/gemini-cli-core';
 
 import type { Content, Part } from '@google/genai';
@@ -70,7 +71,8 @@ export async function runNonInteractive({
         coreEvents.emitConsoleLog(msg.type, msg.content);
       },
     });
-    const textOutput = new TextOutput();
+    const { stdout: workingStdout } = createWorkingStdio();
+    const textOutput = new TextOutput(workingStdout);
 
     const handleUserFeedback = (payload: UserFeedbackPayload) => {
       const prefix = payload.severity.toUpperCase();

packages/cli/src/ui/AppContainer.test.tsx

@@ -65,7 +65,7 @@ vi.mock('@google/gemini-cli-core', async (importOriginal) => {
       ),
     ),
     patchStdio: vi.fn(() => () => {}),
-    createInkStdio: vi.fn(() => ({
+    createWorkingStdio: vi.fn(() => ({
       stdout: process.stdout,
       stderr: process.stderr,
     })),

packages/cli/src/ui/utils/textOutput.ts

@@ -13,6 +13,11 @@ import stripAnsi from 'strip-ansi';
 
 export class TextOutput {
   private atStartOfLine = true;
+  private outputStream: NodeJS.WriteStream;
+
+  constructor(outputStream: NodeJS.WriteStream = process.stdout) {
+    this.outputStream = outputStream;
+  }
 
   /**
    * Writes a string to stdout.
@@ -22,7 +27,7 @@ export class TextOutput {
     if (str.length === 0) {
       return;
     }
-    process.stdout.write(str);
+    this.outputStream.write(str);
     const strippedStr = stripAnsi(str);
     if (strippedStr.length > 0) {
       this.atStartOfLine = strippedStr.endsWith('\n');

packages/cli/src/zed-integration/zedIntegration.ts

@@ -30,6 +30,7 @@ import {
   debugLogger,
   ReadManyFilesTool,
   getEffectiveModel,
+  createWorkingStdio,
   startupProfiler,
 } from '@google/gemini-cli-core';
 import * as acp from './acp.js';
@@ -51,15 +52,10 @@ export async function runZedIntegration(
   settings: LoadedSettings,
   argv: CliArgs,
 ) {
-  const stdout = Writable.toWeb(process.stdout) as WritableStream;
+  const { stdout: workingStdout } = createWorkingStdio();
+  const stdout = Writable.toWeb(workingStdout) as WritableStream;
   const stdin = Readable.toWeb(process.stdin) as ReadableStream<Uint8Array>;
 
-  // Stdout is used to send messages to the client, so console.log/console.info
-  // messages to stderr so that they don't interfere with ACP.
-  console.log = console.error;
-  console.info = console.error;
-  console.debug = console.error;
-
   new acp.AgentSideConnection(
     (client: acp.Client) => new GeminiAgent(config, settings, argv, client),
     stdout,

packages/core/src/code_assist/oauth2.test.ts

@@ -48,7 +48,7 @@ vi.mock('../utils/browser.js', () => ({
 vi.mock('../utils/stdio.js', () => ({
   writeToStdout: vi.fn(),
   writeToStderr: vi.fn(),
-  createInkStdio: vi.fn(() => ({
+  createWorkingStdio: vi.fn(() => ({
     stdout: process.stdout,
     stderr: process.stderr,
   })),

packages/core/src/code_assist/oauth2.ts

@@ -33,7 +33,7 @@ import { FORCE_ENCRYPTED_FILE_ENV_VAR } from '../mcp/token-storage/index.js';
 import { debugLogger } from '../utils/debugLogger.js';
 import {
   writeToStdout,
-  createInkStdio,
+  createWorkingStdio,
   writeToStderr,
 } from '../utils/stdio.js';
 import {
@@ -334,7 +334,7 @@ async function authWithUserCode(client: OAuth2Client): Promise<boolean> {
     const code = await new Promise<string>((resolve, _) => {
       const rl = readline.createInterface({
         input: process.stdin,
-        output: createInkStdio().stdout,
+        output: createWorkingStdio().stdout,
         terminal: true,
       });
 

packages/core/src/utils/stdio.test.ts

@@ -5,7 +5,7 @@
  */
 
 import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
-import { patchStdio, createInkStdio } from './stdio.js';
+import { patchStdio, createWorkingStdio } from './stdio.js';
 import { coreEvents } from './events.js';
 
 vi.mock('./events.js', () => ({
@@ -53,14 +53,14 @@ describe('stdio utils', () => {
     expect(process.stderr.write).toBe(originalStderrWrite);
   });
 
-  it('createInkStdio writes to real stdout/stderr bypassing patch', () => {
+  it('createWorkingStdio writes to real stdout/stderr bypassing patch', () => {
     const cleanup = patchStdio();
-    const { stdout: inkStdout, stderr: inkStderr } = createInkStdio();
+    const { stdout, stderr } = createWorkingStdio();
 
-    inkStdout.write('ink stdout');
+    stdout.write('working stdout');
     expect(coreEvents.emitOutput).not.toHaveBeenCalled();
 
-    inkStderr.write('ink stderr');
+    stderr.write('working stderr');
     expect(coreEvents.emitOutput).not.toHaveBeenCalled();
 
     cleanup();

packages/core/src/utils/stdio.ts

@@ -80,9 +80,9 @@ export function patchStdio(): () => void {
 /**
  * Creates proxies for process.stdout and process.stderr that use the real write methods
  * (writeToStdout and writeToStderr) bypassing any monkey patching.
- * This is used by Ink to render to the real output.
+ * This is used to write to the real output even when stdio is patched.
  */
-export function createInkStdio() {
+export function createWorkingStdio() {
   const inkStdout = new Proxy(process.stdout, {
     get(target, prop, receiver) {
       if (prop === 'write') {