task-master-marcus-ver/mcp-server/src/tools/write-code.js

A task management system for ambitious AI-driven development that doesn't overwhelm and confuse Cursor.

/**
 * tools/write-code.js
 * Tool to find the next task to work on
 */

import { z } from 'zod';
import {
	handleApiResult,
	createErrorResponse,
	withNormalizedProjectRoot
} from './utils.js';
import { writeCodeDirect } from '../core/task-master-core.js';
import {
	findTasksJsonPath,
	findComplexityReportPath
} from '../core/utils/path-utils.js';

/**
 * Register the next-task tool with the MCP server
 * @param {Object} server - FastMCP server instance
 */
export function registerWriteCodeTool(server) {
	server.addTool({
		name: 'write_code',
		description:
			'Find the next task to work on based on dependencies and status. Then, write code according to the task details.',
		parameters: z.object({
			file: z.string().optional().describe('relative path to the tasks file'),
			complexityReport: z
				.string()
				.optional()
				.describe(
					'Path to the complexity report file (relative to project root or absolute)'
				),
			projectRoot: z
				.string()
				.describe('The directory of the project. Must be an relative path.'), 
			old_string: z
				.string()
				.describe('The old code to search from the file'),
			new_string: z
				.string()
				.describe('The new code to replace the old code in the file'),
			expected_replacements: z
				.number()
				.optional()
				.default(1)
				.describe('Number of identical old code replacements to perform')
		}),
		execute: withNormalizedProjectRoot(async (args, { log, session }) => {
			try {
				log.info(`Finding next task with args: ${JSON.stringify(args)}`);

				// Use args.projectRoot directly (guaranteed by withNormalizedProjectRoot)
				let tasksJsonPath;
				try {
					tasksJsonPath = findTasksJsonPath(
						{ projectRoot: args.projectRoot, file: args.file },
						log
					);
				} catch (error) {
					log.error(`Error finding tasks.json: ${error.message}`);
					return createErrorResponse(
						`Failed to find tasks.json: ${error.message}`
					);
				}

				// Resolve the path to complexity report
				let complexityReportPath;
				try {
					complexityReportPath = findComplexityReportPath(
						args.projectRoot,
						args.complexityReport,
						log
					);
				} catch (error) {
					log.error(`Error finding complexity report: ${error.message}`);
				}
				const result = await writeCodeDirect(
					{
						tasksJsonPath: tasksJsonPath,
						reportPath: complexityReportPath,
						oldString: old_string,
						newString: new_string,
						expectedReplacements: expected_replacements
					},
					log
				);

				if (result.success) {
					log.info(
						`Successfully found next task: ${result.data?.task?.id || 'No available tasks'}`
					);
				} else {
					log.error(
						`Failed to find next task: ${result.error?.message || 'Unknown error'}`
					);
				}

				return handleApiResult(result, log, 'Error finding next task');
			} catch (error) {
				log.error(`Error in nextTask tool: ${error.message}`);
				return createErrorResponse(error.message);
			}
		})
	});
}