mcp-resend - SKILL.md Agent Skill

name: mcp-resend description: Resend MCP wrapper. Activate for developer-first transactional email with React Email components. Routes to MCP tools if available, else generates React Email components for local rendering. allowed-tools: Read, Bash, Write

MCP Resend Wrapper

Resend email API integration. Developer-first, React Email native.

MCP Server

Server command: npx -y @modelcontextprotocol/server-resend (or community equivalent) Required env: RESEND_API_KEY, RESEND_FROM_EMAIL Setup: Resend API keys

Tools exposed (when MCP configured)

Tool	Purpose
`mcp__resend__sendEmail`	Send transactional email (React Email component → HTML)
`mcp__resend__sendBatch`	Batch send (up to 100 recipients)
`mcp__resend__getDomains`	List verified sending domains
`mcp__resend__addDomain`	Add + verify new sending domain
`mcp__resend__getDeliveryStats`	Delivery, open, click events

Common use patterns

Send with React Email component

Tool: mcp__resend__sendEmail
Args: {
  from: "hello@brand.com",
  to: "user@example.com",
  subject: "Welcome!",
  react: <WelcomeEmail firstName="..." />
}

Batch send

Tool: mcp__resend__sendBatch
Args: {
  from: "newsletter@brand.com",
  subject: "Weekly Update",
  recipients: [{to: "u1@x.com", data: {name: "Alice"}}, ...]
}

Error handling

Error	Cause	Fix
`403 Forbidden`	Domain not verified	Add + verify domain in Resend dashboard
`422 Validation Error`	Invalid email/recipient	Validate with regex; check `to` is array
`429 Too Many Requests`	Rate limit (2/sec default, 100/sec with batch)	Batch sends, implement backoff

Manual Fallback (no MCP server)

If mcp__resend__* tools not available:

Generate React Email components in plans/marketing/<campaign>/emails/<name>.tsx:

import { Html, Head, Body, Container, Text, Button } from "@react-email/components";

export default function WelcomeEmail({ firstName }: { firstName: string }) {
  return (
    <Html>
      <Head />
      <Body>
        <Container>
          <Text>Hi {firstName},</Text>
          <Button href="https://...">Get Started</Button>
        </Container>
      </Body>
    </Html>
  );
}

Install deps: npm install @react-email/components react
Render locally: Use React Email's preview server (email dev)

Send via curl:

curl -X POST https://api.resend.com/emails \
  -H "Authorization: Bearer $RESEND_API_KEY" \
  -d @{"from":"...","to":"...","subject":"...","html":"..."}

Cross-references

skills/automation/mcp-sendgrid/SKILL.md — alternative (full-featured email)
skills/marketing/emails/SKILL.md — email marketing methodology