feat: Support custom response language (#510)

* feat: Support custom response language

* fix: Add default values for response language in config-manager.js

* chore: Update configuration file and add default response language settings

* feat: Support MCP/CLI custom response language

* chore: Update test comments to English for consistency

* docs: Auto-update and format models.md

* chore: fix format

---------

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: Ralph Khreish <35776126+Crunchyman-ralph@users.noreply.github.com>

mcp-server/src/core/direct-functions/response-language.js

@@ -0,0 +1,40 @@
+/**
+ * response-language.js
+ * Direct function for managing response language via MCP
+ */
+
+import { setResponseLanguage } from '../../../../scripts/modules/task-manager.js';
+import {
+	enableSilentMode,
+	disableSilentMode
+} from '../../../../scripts/modules/utils.js';
+import { createLogWrapper } from '../../tools/utils.js';
+
+export async function responseLanguageDirect(args, log, context = {}) {
+	const { projectRoot, language } = args;
+	const mcpLog = createLogWrapper(log);
+
+	log.info(
+		`Executing response-language_direct with args: ${JSON.stringify(args)}`
+	);
+	log.info(`Using project root: ${projectRoot}`);
+
+	try {
+		enableSilentMode();
+		return setResponseLanguage(language, {
+			mcpLog,
+			projectRoot
+		});
+	} catch (error) {
+		return {
+			success: false,
+			error: {
+				code: 'DIRECT_FUNCTION_ERROR',
+				message: error.message,
+				details: error.stack
+			}
+		};
+	} finally {
+		disableSilentMode();
+	}
+}

mcp-server/src/tools/index.js

@@ -29,6 +29,7 @@ import { registerRemoveTaskTool } from './remove-task.js';
 import { registerInitializeProjectTool } from './initialize-project.js';
 import { registerModelsTool } from './models.js';
 import { registerMoveTaskTool } from './move-task.js';
+import { registerResponseLanguageTool } from './response-language.js';
 import { registerAddTagTool } from './add-tag.js';
 import { registerDeleteTagTool } from './delete-tag.js';
 import { registerListTagsTool } from './list-tags.js';
@@ -83,6 +84,7 @@ export function registerTaskMasterTools(server) {
 		registerRemoveDependencyTool(server);
 		registerValidateDependenciesTool(server);
 		registerFixDependenciesTool(server);
+		registerResponseLanguageTool(server);
 
 		// Group 7: Tag Management
 		registerListTagsTool(server);

mcp-server/src/tools/response-language.js

@@ -0,0 +1,46 @@
+import { z } from 'zod';
+import {
+	createErrorResponse,
+	handleApiResult,
+	withNormalizedProjectRoot
+} from './utils.js';
+import { responseLanguageDirect } from '../core/direct-functions/response-language.js';
+
+export function registerResponseLanguageTool(server) {
+	server.addTool({
+		name: 'response-language',
+		description: 'Get or set the response language for the project',
+		parameters: z.object({
+			projectRoot: z
+				.string()
+				.describe(
+					'The root directory for the project. ALWAYS SET THIS TO THE PROJECT ROOT DIRECTORY. IF NOT SET, THE TOOL WILL NOT WORK.'
+				),
+			language: z
+				.string()
+				.describe(
+					'The new response language to set. like "中文" "English" or "español".'
+				)
+		}),
+		execute: withNormalizedProjectRoot(async (args, { log, session }) => {
+			try {
+				log.info(
+					`Executing response-language tool with args: ${JSON.stringify(args)}`
+				);
+
+				const result = await responseLanguageDirect(
+					{
+						...args,
+						projectRoot: args.projectRoot
+					},
+					log,
+					{ session }
+				);
+				return handleApiResult(result, log, 'Error setting response language');
+			} catch (error) {
+				log.error(`Error in response-language tool: ${error.message}`);
+				return createErrorResponse(error.message);
+			}
+		})
+	});
+}