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Resend

Send emails programmatically with modern APIs, built-in analytics, and reliable delivery.

Installation Instructions →

How to Use Model Context Protocol (MCP) in Cursor

What is MCP?

Model Context Protocol (MCP) is an open protocol that allows you to provide custom tools to agentic LLMs (Large Language Models) in Cursor's Composer feature.

Installation Steps

  1. Open Cursor Settings
    • Navigate to Cursor Settings > Features > MCP
    • Click the "+ Add New MCP Server" button
  2. Configure the Server
    • Name: Give your server a nickname
    • Type: Select the transport type (stdio or sse)
    • Command/URL: Enter either:
      • For SSE servers: The URL of the SSE endpoint
      • For stdio servers: A valid shell command to run the server

Example Configurations

For stdio Server (Resend Example):

Command: node ~/mcp-quickstart/resend-server/build/index.js --api-key $RESEND_API_KEY --from $RESEND_FROM_EMAIL

For SSE Server:

URL: https://api.resend.com/sse

Using MCP Tools

Tool Availability

  • • After adding a server, it will appear in your MCP servers list
  • • You may need to click the refresh button to populate the tool list

Using Tools in Composer

  • • The Composer Agent automatically uses MCP tools when relevant
  • • You can explicitly prompt tool usage by:
    • Referring to the tool by name
    • Describing the tool's function

Tool Execution Process

  • • Displays a message in chat requesting approval
  • • Shows tool call arguments (expandable)
  • • Executes the tool upon user approval
  • • Displays the tool's response in the chat

Important Notes

  • • MCP tools may not work with all models
  • • MCP tools are only available to the Agent in Composer
  • • For Resend integration, you need to set up RESEND_API_KEY and RESEND_FROM_EMAIL environment variables
  • • Create an account on Resend and get your API key from the dashboard
  • • Verify your domain or use a Resend-provided email address for testing
  • • Set up your default FROM email address in RESEND_FROM_EMAIL
  • • For security, use a wrapper script that sets the environment variables before running the server
  • • Monitor email delivery status and handle bounces appropriately
  • • Consider implementing email templates for consistent formatting
  • • Be mindful of daily sending limits and API rate limits
  • • Implement proper error handling for failed email sends
  • • Use HTML sanitization for user-generated content in emails
  • • Follow email best practices for deliverability and spam prevention
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