spb/skills-spboucher-ai

1#!/usr/bin/env node2// Minimal MCP server over stdio: JSON-RPC 2.0, one message per line.3// One tool, `echo`. No dependencies, no network, no filesystem access.4import { createInterface } from "node:readline";56const SUPPORTED = ["2025-06-18", "2025-03-26", "2024-11-05"];7const TOOLS = [8  {9    name: "echo",10    description: "Returns the text it receives, unchanged.",11    inputSchema: {12      type: "object",13      properties: { text: { type: "string", description: "Text to echo back." } },14      required: ["text"],15      additionalProperties: false,16    },17  },18];1920const send = (message) => process.stdout.write(JSON.stringify(message) + "\n");21const result = (id, value) => send({ jsonrpc: "2.0", id, result: value });22const error = (id, code, message) => send({ jsonrpc: "2.0", id, error: { code, message } });2324function handle(message) {25  const isRequest = message.id !== undefined && message.id !== null;26  if (message.jsonrpc !== "2.0" || typeof message.method !== "string") {27    if (isRequest) error(message.id, -32600, "Invalid Request");28    return;29  }30  if (!isRequest) return; // notifications (for example notifications/initialized) need no reply31  const params = message.params ?? {};32  switch (message.method) {33    case "initialize":34      return result(message.id, {35        protocolVersion: SUPPORTED.includes(params.protocolVersion) ? params.protocolVersion : SUPPORTED[0],36        capabilities: { tools: {} },37        serverInfo: { name: "echo-mcp-server", version: "1.0.1" },38      });39    case "ping":40      return result(message.id, {});41    case "tools/list":42      return result(message.id, { tools: TOOLS });43    case "tools/call": {44      if (params.name !== "echo") return error(message.id, -32602, `Unknown tool: ${String(params.name)}`);45      const text = params.arguments?.text;46      if (typeof text !== "string") {47        return result(message.id, { content: [{ type: "text", text: "The `text` argument must be a string." }], isError: true });48      }49      return result(message.id, { content: [{ type: "text", text }], isError: false });50    }51    default:52      return error(message.id, -32601, `Method not found: ${message.method}`);53  }54}5556createInterface({ input: process.stdin, crlfDelay: Infinity }).on("line", (line) => {57  if (!line.trim()) return;58  let message;59  try {60    message = JSON.parse(line);61  } catch {62    return error(null, -32700, "Parse error");63  }64  if (Array.isArray(message)) return error(null, -32600, "Batch requests are not supported");65  handle(message);66});67