IteraTools MCP

Instructions

Implementation Reference

• index.js:40-40 (registration)

  The tool 'crypto_price' is defined in the TOOLS array with its endpoint, schema, and description.

  { name: 'crypto_price', description: 'Get current cryptocurrency price', inputSchema: { type: 'object', properties: { coin: { type: 'string', default: 'bitcoin', description: 'Coin name (e.g. bitcoin, ethereum)' } }, required: [] }, endpoint: '/crypto/price', price: '$0.001' },

• index.js:94-115 (handler)

  The tool request handler dynamically dispatches to 'callTool' based on the tool definition.

  server.setRequestHandler(CallToolRequestSchema, async (request) => {
    const { name, arguments: args } = request.params;
    
    if (!API_KEY) {
      return {
        content: [{ type: 'text', text: 'Error: ITERATOOLS_API_KEY environment variable not set. Get a key at https://iteratools.com' }],
        isError: true,
      };
    }
    
    const tool = TOOLS.find(t => t.name === name);
    if (!tool) {
      return { content: [{ type: 'text', text: `Unknown tool: ${name}` }], isError: true };
    }
    
    try {
      const result = await callTool(tool.endpoint, args);
      return { content: [{ type: 'text', text: JSON.stringify(result, null, 2) }] };
    } catch (err) {
      return { content: [{ type: 'text', text: `Error: ${err.message}` }], isError: true };
    }
  });

• index.js:50-79 (helper)

  The 'callTool' helper function executes the API request for the specified endpoint.

  async function callTool(endpoint, params) {
    const fetch = (await import('node-fetch')).default;
    const isGet = ['GET'].includes((TOOLS.find(t => t.endpoint === endpoint) || {}).method);
    
    const url = isGet 
      ? `${BASE_URL}${endpoint}?${new URLSearchParams(params)}`
      : `${BASE_URL}${endpoint}`;
    
    const res = await fetch(url, {
      method: isGet ? 'GET' : 'POST',
      headers: {
        'Content-Type': 'application/json',
        'Authorization': `Bearer ${API_KEY}`,
      },
      body: isGet ? undefined : JSON.stringify(params),
    });
    
    const text = await res.text();
    let data;
    try { data = JSON.parse(text); } catch { data = { raw: text }; }
    
    if (!res.ok) {
      if (res.status === 402) {
        throw new Error(`Insufficient credits. Add credits at https://iteratools.com. Cost: ${TOOLS.find(t=>t.endpoint===endpoint)?.price || 'see docs'}`);
      }
      throw new Error(`API error ${res.status}: ${text.substring(0, 200)}`);
    }
    
    return data;
  }