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 }],
          };
      }
  }