feat(cli): conditionally exclude ask_user tool in ACP mode

This prevents IDEs like IntelliJ from intercepting the ask_user tool call and presenting confusing allow/reject permission dialogs to the user, forcing the model to fallback to plain text conversational queries instead.

packages/cli/src/config/config.test.ts

@@ -2225,6 +2225,18 @@ describe('loadCliConfig tool exclusions', () => {
     expect(config.getExcludeTools()).toContain('ask_user');
   });
 
+  it('should exclude ask_user in interactive mode when --acp is provided', async () => {
+    process.stdin.isTTY = true;
+    process.argv = ['node', 'script.js', '--acp'];
+    const argv = await parseArguments(createTestMergedSettings());
+    const config = await loadCliConfig(
+      createTestMergedSettings(),
+      'test-session',
+      argv,
+    );
+    expect(config.getExcludeTools()).toContain('ask_user');
+  });
+
   it('should not exclude shell tool in non-interactive mode when --allowed-tools="ShellTool" is set', async () => {
     process.stdin.isTTY = false;
     process.argv = [

packages/cli/src/config/config.ts

@@ -648,12 +648,16 @@ export async function loadCliConfig(
 
   const allowedTools = argv.allowedTools || settings.tools?.allowed || [];
 
+  const isAcpMode = !!argv.acp || !!argv.experimentalAcp;
+
   // In non-interactive mode, exclude tools that require a prompt.
   const extraExcludes: string[] = [];
-  if (!interactive) {
+  if (!interactive || isAcpMode) {
     // The Policy Engine natively handles headless safety by translating ASK_USER
     // decisions to DENY. However, we explicitly block ask_user here to guarantee
     // it can never be allowed via a high-priority policy rule when no human is present.
+    // We also exclude it in ACP mode as IDEs intercept tool calls and ask for permission,
+    // breaking conversational flows.
     extraExcludes.push(ASK_USER_TOOL_NAME);
   }
 
@@ -737,7 +741,6 @@ export async function loadCliConfig(
     }
   }
 
-  const isAcpMode = !!argv.acp || !!argv.experimentalAcp;
   let clientName: string | undefined = undefined;
   if (isAcpMode) {
     const ide = detectIdeFromEnv();