File Operation MCP Server

import type { McpServer } from '@modelcontextprotocol/sdk/server/mcp.js'; import { z } from 'zod'; function jsonToCsv(jsonData: any[]): string { if (!Array.isArray(jsonData) || jsonData.length === 0) { throw new Error('Input must be a non-empty array of objects.'); } const headers = Object.keys(jsonData[0]); const csvRows = [headers.join(',')]; for (const row of jsonData) { const values = headers.map(header => { const value = row[header]; // Basic escaping for values containing commas return typeof value === 'string' && value.includes(',') ? `"${value}"` : value; }); csvRows.push(values.join(',')); } return csvRows.join('\n'); } function csvToJson(csvData: string): any[] { const lines = csvData.trim().split('\n'); if (lines.length < 2) { throw new Error('CSV data must have a header row and at least one data row.'); } const headers = lines[0].split(','); const jsonData = []; for (let i = 1; i < lines.length; i++) { const values = lines[i].split(','); const rowObject: { [key: string]: string } = {}; for (let j = 0; j < headers.length; j++) { rowObject[headers[j]] = values[j]; } jsonData.push(rowObject); } return jsonData; } export default function dataTransformation(server: McpServer) { server.registerTool( 'data-transformation', { title: 'Data Transformation', description: 'Converts data between different formats (e.g., JSON to CSV). Handles simple data structures only.', inputSchema: { from_format: z.enum(['json', 'csv']).describe('The source data format.'), to_format: z.enum(['json', 'csv']).describe('The target data format.'), data: z.string().describe('The string representation of the data to convert.'), }, }, async (params: { from_format: 'json' | 'csv'; to_format: 'json' | 'csv'; data: string }) => { const { from_format, to_format, data } = params; if (from_format === to_format) { return { content: [{ type: 'text', text: 'Source and target formats cannot be the same.' }], isError: true }; } try { let resultData: string; if (from_format === 'json' && to_format === 'csv') { const jsonData = JSON.parse(data); resultData = jsonToCsv(jsonData); } else if (from_format === 'csv' && to_format === 'json') { const jsonData = csvToJson(data); resultData = JSON.stringify(jsonData, null, 2); } else { return { content: [{ type: 'text', text: `Unsupported conversion from ${from_format} to ${to_format}.` }], isError: true }; } return { content: [{ type: 'text', text: resultData }] }; } catch (error: any) { return { content: [{ type: 'text', text: `An error occurred during transformation: ${error.message}` }], isError: true, }; } } ); }