Updating Your MCP Configuration

Now, let's update your MCP configuration in src/mastra/agents/index.ts to include the Zapier server:

const mcp = new MCPClient({
  servers: {
    zapier: {
      url: new URL(process.env.ZAPIER_MCP_URL || ''),
      requestInit: {
        headers: {
          Authorization: `Bearer ${process.env.ZAPIER_MCP_API_KEY}`,
        },
      },
    },
  },
})

This configuration tells your agent how to connect to the Zapier MCP server. Here is what each part does:

• zapier: A unique identifier for this server in your configuration
• url: The Zapier MCP server endpoint, read from your .env file
• requestInit.headers: HTTP headers sent with every request to the server
• Authorization: Bearer ...: Your API key, sent as a Bearer token to authenticate with Zapier

The new URL() constructor creates a URL object from the string provided by the environment variable. The || "" part provides a default empty string in case the environment variable is not set, which prevents your application from crashing if the environment variable is missing.

The requestInit option lets you customize HTTP requests to the MCP server. Zapier requires an Authorization header with your API key in Bearer {apiKey} format to verify your identity on every request.