CoinStats MCP Server

Instructions

Implementation Reference

• src/tools/toolConfigs.ts:406-423 (schema)

  Tool configuration including name, description, endpoint, HTTP method, and Zod input schema for parameters.
  { name: 'add-portfolio-transaction', description: 'Add a transaction to a manual portfolio.', endpoint: '/portfolio/transaction', method: 'POST', parameters: { shareToken: z.string().optional().describe('Portfolio share token'), // This endpoint requires a request body which would need to match the AddTransactionDto schema // For simplicity, we're defining a basic structure that matches the expected input coinId: z.string().describe('Coin ID'), type: z.string().describe('Transaction type'), date: z.string().describe('Transaction date in ISO format'), amount: z.number().describe('Transaction amount'), price: z.number().describe('Price per coin'), fee: z.number().optional().describe('Transaction fee'), notes: z.string().optional().describe('Transaction notes'), }, },
• src/index.ts:17-18 (registration)

  Registers the add-portfolio-transaction tool (included in allToolConfigs) with the MCP server by calling registerTools.
  // Register all tools from configurations registerTools(server, allToolConfigs);
• src/tools/toolFactory.ts:20-77 (handler)

  Generic handler for the tool: determines if local or API, for API calls universalApiHandler with appropriate params/body based on method (for POST uses params as body).
  toolConfigs.forEach((config) => { server.tool(config.name, config.description, config.parameters, async (params: Record<string, any>) => { // Handle local operations if (config.isLocal) { // Handle specific local tools if (config.name === 'save-share-token') { await saveToCache('shareToken', params.shareToken); return { content: [ { type: 'text', text: 'Share token saved successfully', }, ], }; } if (config.name === 'get-share-token') { const shareToken = await getFromCache('shareToken'); return { content: [ { type: 'text', text: shareToken ? shareToken : 'No share token found in cache', isError: !shareToken, }, ], }; } // Future local tools can be added here // Default response for unhandled local tools return { content: [ { type: 'text', text: 'Operation completed', }, ], }; } // Handle API operations const basePath = config.basePath || COINSTATS_API_BASE; const method = config.method || 'GET'; // Methods that typically have a request body const bodyMethods = ['POST', 'PUT', 'PATCH', 'DELETE']; // For GET/DELETE requests, all params go in the URL // For POST/PUT/PATCH, send params as the body if (bodyMethods.includes(method.toUpperCase())) { return universalApiHandler(basePath, config.endpoint, method, {}, params); } else { return universalApiHandler(basePath, config.endpoint, method, params); } });
• src/services/request.ts:35-97 (helper)

  Core HTTP request handler: processes path/query params, makes fetch to CoinStats API with API key, handles errors, returns MCP-formatted response (JSON string).
  export async function universalApiHandler<T>( basePath: string, endpoint: string, method: string = 'GET', params: Record<string, any> = {}, body?: any ): Promise<{ content: Array<{ type: 'text'; text: string; isError?: boolean }>; }> { try { // Handle path parameters - replace {paramName} in endpoint with actual values let processedEndpoint = endpoint; let processedParams = { ...params }; // Find all path parameters in the endpoint (e.g., {coinId}, {id}, {type}) const pathParamMatches = endpoint.match(/\{([^}]+)\}/g); if (pathParamMatches) { for (const match of pathParamMatches) { const paramName = match.slice(1, -1); // Remove { and } if (processedParams[paramName] !== undefined) { // Replace the placeholder with the actual value processedEndpoint = processedEndpoint.replace(match, processedParams[paramName]); // Remove the parameter from query params since it's now part of the path delete processedParams[paramName]; } else { throw new Error(`Required path parameter '${paramName}' is missing`); } } } // MCP clients might not support '~' in parameter names, so we replace '-' with '~' specifically for the /coins endpoint before making the request. if (endpoint === '/coins') { processedParams = Object.entries(processedParams).reduce((acc, [key, value]) => { acc[key.replace(/-/g, '~')] = value; return acc; }, {} as Record<string, any>); } const url = `${basePath}${processedEndpoint}`; const data = await makeRequestCsApi<T>(url, method, processedParams, body); if (!data) { return { content: [{ type: 'text', text: 'Something went wrong', isError: true }], }; } return { content: [ { type: 'text', text: JSON.stringify(data), }, ], }; } catch (error) { return { content: [{ type: 'text', text: `Error: ${error}`, isError: true }], }; } }