File Operation MCP Server

import type { McpServer } from '@modelcontextprotocol/sdk/server/mcp.js'; import { z } from 'zod'; import fs from 'fs-extra'; export default function findAndReplace(server: McpServer) { server.registerTool( 'find-and-replace', { title: 'Find and Replace in File', description: 'Finds and replaces text in a file using a string or a regular expression.', inputSchema: { path: z.string().describe('The path to the file to modify.'), search: z.string().describe('The text or regex pattern to search for.'), replace: z.string().describe('The text to replace the search term with.'), isRegex: z.boolean().optional().default(false).describe('Set to true if the search term is a regular expression.'), replaceAll: z.boolean().optional().default(true).describe('Set to false to replace only the first occurrence.'), }, }, async (params: { path: string; search: string; replace: string; isRegex?: boolean; replaceAll?: boolean }) => { try { if (!(await fs.pathExists(params.path))) { return { content: [{ type: 'text', text: `Error: File does not exist: ${params.path}` }], isError: true }; } const fileContent = await fs.readFile(params.path, 'utf-8'); let newContent: string; if (params.isRegex) { const regex = new RegExp(params.search, params.replaceAll ? 'g' : ''); newContent = fileContent.replace(regex, params.replace); } else { if (params.replaceAll) { newContent = fileContent.split(params.search).join(params.replace); } else { newContent = fileContent.replace(params.search, params.replace); } } if (newContent === fileContent) { return { content: [{ type: 'text', text: 'No changes were made. The search term was not found.' }] }; } await fs.writeFile(params.path, newContent, 'utf-8'); return { content: [{ type: 'text', text: `Successfully replaced content in ${params.path}.` }] }; } catch (error: any) { return { content: [{ type: 'text', text: `An error occurred: ${error.message}` }], isError: true, }; } } ); }