server: reject agent commands in remote CLI

src/vs/server/node/server.cli.ts

@@ -16,6 +16,7 @@ import { PipeCommand } from '../../workbench/api/node/extHostCLIServer.js';
 import { hasStdinWithoutTty, getStdinFilePath, readFromStdin } from '../../platform/environment/node/stdin.js';
 import { DeferredPromise } from '../../base/common/async.js';
 import { FileAccess } from '../../base/common/network.js';
+import { hasAgentCommand } from './server.cliAgent.js';
 
 /*
  * Implements a standalone CLI app that opens VS Code from a remote terminal.
@@ -95,6 +96,12 @@ export async function main(desc: ProductDescription, args: string[]): Promise<vo
 		return;
 	}
 
+	if (hasAgentCommand(args)) {
+		console.error(`The 'agent' command is not supported by the remote CLI.`);
+		process.exitCode = 1;
+		return;
+	}
+
 	// take the local options and remove the ones that don't apply
 	const options: OptionDescriptions<Required<RemoteParsedArgs>> = { ...OPTIONS, gitCredential: { type: 'string' }, openExternal: { type: 'boolean' } };
 	const isSupported = cliCommand ? isSupportedForCmd : isSupportedForPipe;

src/vs/server/node/server.cliAgent.ts

@@ -0,0 +1,45 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import { OPTIONS, type Option } from '../../platform/environment/node/argv.js';
+
+export function hasAgentCommand(args: readonly string[]): boolean {
+	let valueForOption = false;
+	for (const arg of args) {
+		if (valueForOption) {
+			valueForOption = false;
+			continue;
+		}
+		if (arg === '--') {
+			return false;
+		}
+		if (arg === 'agent') {
+			return true;
+		}
+		const option = getOption(arg);
+		if (option?.type === 'string' || option?.type === 'string[]') {
+			valueForOption = true;
+		}
+	}
+	return false;
+}
+
+function getOption(arg: string): Option<'boolean'> | Option<'string'> | Option<'string[]'> | undefined {
+	if (!arg.startsWith('-') || arg.includes('=')) {
+		return undefined;
+	}
+	const id = arg.startsWith('--') ? arg.slice(2) : arg.slice(1);
+	for (const [optionId, option] of Object.entries(OPTIONS)) {
+		if (option.type !== 'subcommand' && (id === option.alias || id === optionId)) {
+			return option;
+		}
+	}
+	for (const [optionId, option] of Object.entries(OPTIONS['agent'].options)) {
+		if (id === option.alias || id === optionId) {
+			return option;
+		}
+	}
+	return undefined;
+}

src/vs/server/test/node/server.cliAgent.test.ts

@@ -0,0 +1,32 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import assert from 'assert';
+import { ensureNoDisposablesAreLeakedInTestSuite } from '../../../base/test/common/utils.js';
+import { hasAgentCommand } from '../../node/server.cliAgent.js';
+
+suite('Server CLI agent command guard', () => {
+	ensureNoDisposablesAreLeakedInTestSuite();
+
+	test('detects agent endpoints', () => {
+		assert.strictEqual(hasAgentCommand(['agent', 'endpoints', '--user-data-dir', '/home/tester/.vscode-remote']), true);
+	});
+
+	test('detects agent after global native CLI options', () => {
+		assert.strictEqual(hasAgentCommand(['--cli-data-dir', '/x', 'agent', 'endpoints', '--user-data-dir', '/y']), true);
+	});
+
+	test('ignores non-agent commands', () => {
+		assert.strictEqual(hasAgentCommand(['--version']), false);
+	});
+
+	test('does not treat a global option value as an agent command', () => {
+		assert.strictEqual(hasAgentCommand(['--profile', 'agent']), false);
+	});
+
+	test('does not detect agent after the option terminator', () => {
+		assert.strictEqual(hasAgentCommand(['--', 'agent', 'endpoints']), false);
+	});
+});