File Operation MCP Server

import type { McpServer } from '@modelcontextprotocol/sdk/server/mcp.js'; import { z } from 'zod'; /** * Tool: Set Environment Variable * Registers the tool with the MCP server * @param server MCP server instance */ const registerTool = (server: McpServer) => { server.registerTool( 'set-environment-variable', { title: 'Set Environment Variable', description: "Sets or deletes an environment variable for the current session. System-wide scope is not supported.", inputSchema: { key: z.string().describe("The key of the environment variable."), value: z.string().optional().describe("The string value to set."), scope: z.enum(['session', 'system']).optional().default('session').describe("The scope of the variable. Only 'session' is currently supported."), delete: z.boolean().optional().default(false).describe("If true, deletes the environment variable."), } }, async ({ key, value, scope, delete: delete_var, }) => { if (scope === 'system') { return { content: [{ type: 'text', text: 'Error: Setting system-wide environment variables is not supported.' }], isError: true }; } try { if (delete_var) { if (key in process.env) { delete process.env[key]; return { content: [{ type: 'text', text: `Successfully deleted environment variable "${key}" for the current session.` }] }; } else { return { content: [{ type: 'text', text: `Info: Environment variable "${key}" was not set.` }] }; } } if (value === undefined) { return { content: [{ type: 'text', text: 'Error: A value must be provided to set an environment variable. To delete a variable, set the `delete` flag to true.' }], isError: true }; } process.env[key] = value; return { content: [{ type: 'text', text: `Successfully set environment variable "${key}" to "${value}" for the current session.` }] }; } catch (error: any) { return { content: [{ type: 'text', text: `Error setting environment variable: ${error.message}` }], isError: true }; } } ); }; export default registerTool;