mcp-git

import type {McpServer, ToolCallback} from '@modelcontextprotocol/sdk/server/mcp.js'; import type {ToolConfig} from '../types.js'; import {HTTP_FETCH_INPUT_SCHEMA, inputToRequestOptions} from './common.js'; const JSON_ACCEPT_HEADER = 'application/json, text/json, */*;q=0.8'; const BROWSER_USER_AGENT = 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36'; export class FetchJsonTool { get name() { return 'fetch-json'; } readonly config: ToolConfig<typeof HTTP_FETCH_INPUT_SCHEMA, never> = { description: 'Fetch a URI over HTTP and return the raw response body as text with response metadata.', inputSchema: HTTP_FETCH_INPUT_SCHEMA, annotations: { title: 'Fetch JSON', readOnlyHint: false, openWorldHint: true, }, }; register(srv: McpServer) { srv.registerTool(this.name, this.config, this.#handle); } readonly #handle: ToolCallback<typeof HTTP_FETCH_INPUT_SCHEMA> = async (input) => { const options = inputToRequestOptions(input); options.headers = new Headers(options.headers); if (!options.headers.has('Accept')) { options.headers.set('Accept', JSON_ACCEPT_HEADER); } if (!options.headers.has('User-Agent')) { options.headers.set('User-Agent', BROWSER_USER_AGENT); } const response = await fetch(input.uri, options); const metadata: Record<string, unknown> = { status: response.status, statusText: response.statusText, headers: Object.fromEntries(response.headers.entries()), url: response.url, type: response.type, redirected: response.redirected, }; return { content: [ { type: 'text', text: JSON.stringify(metadata), }, { type: 'text', text: await response.text(), }, ], }; }; }