Marketstack MCP Server

Instructions

Implementation Reference

• src/tools/referenceData/listExchanges.ts:33-52 (handler)

  The handler function for the 'list_exchanges' tool that fetches exchange data from Marketstack API using provided search, limit, and offset parameters.

  const listExchangesHandler = async (input: Input, client: MarketstackClient): Promise<Output> => {
    try {
      const { search, limit, offset } = input;
  
      const apiRequestParams: MarketstackApiParams = {
        endpoint: 'exchanges',
        ...(search && { search }), // Include if search is provided
        ...(limit && { limit }), // Include if limit is provided
        ...(offset && { offset }), // Include if offset is provided
      };
  
      const data = await client.fetchApiData(apiRequestParams);
  
      return data;
    } catch (error: unknown) {
      console.error('listExchanges tool error:', error);
      const message = error instanceof Error ? error.message : 'An unknown error occurred.';
      throw new Error(`listExchanges tool failed: ${message}`);
    }
  };

• src/tools/referenceData/listExchanges.ts:5-26 (schema)

  Zod-based input schema shape for the 'list_exchanges' tool, defining optional search, limit, and offset parameters.

  const listExchangesInputSchemaShape = {
    search: z.string().optional().describe('Use this parameter to search stock exchanges by name or MIC.'),
    limit: z
      .number()
      .int()
      .min(1)
      .max(1000)
      .optional()
      .default(100)
      .describe(
        'Specify a pagination limit (number of results per page) for your API request. Default limit value is `100`, maximum allowed limit value is `1000`.'
      ),
    offset: z
      .number()
      .int()
      .min(0)
      .optional()
      .default(0)
      .describe(
        'Specify a pagination offset value for your API request. Example: An offset value of `100` combined with a limit value of 10 would show results 100-110. Default value is `0`, starting with the first available result.'
      ),
  };

• src/tools/referenceData/index.ts:43-48 (registration)

  Registration of the 'list_exchanges' tool with the MCP server using server.tool(), wrapping the handler for client injection.

  server.tool(
    listExchangesTool.name,
    listExchangesTool.description,
    listExchangesTool.inputSchemaShape,
    wrapToolHandler((input) => listExchangesTool.handler(input, client))
  );

• src/tools/referenceData/listExchanges.ts:62-67 (helper)

  Tool definition object exporting name, description, input schema, and handler for the 'list_exchanges' tool.

  export const listExchangesTool: MarketstackToolDefinition = {
    name: 'list_exchanges',
    description: 'Look up information any of the 2700+ stock exchanges supported by this endpoint.',
    inputSchemaShape: listExchangesInputSchemaShape,
    handler: listExchangesHandler,
  };