resend

name: resend description: Use when working with Resend email platform - routes to specific sub-skills for sending, receiving, audiences, or broadcasts. license: MIT metadata: author: resend version: "2.5.0" homepage: https://resend.com source: https://github.com/resend/resend-skills inputs: - name: RESEND_API_KEY description: Resend API key for sending and receiving emails. Get yours at https://resend.com/api-keys required: true - name: RESEND_WEBHOOK_SECRET description: Webhook signing secret for verifying event payloads. Found in the Resend dashboard under Webhooks after creating an endpoint. required: false

Overview

Resend is an email platform for developers. This skill routes to feature-specific sub-skills.

Sub-Skills

Feature	Skill	Use When
Sending emails	`send-email`	Transactional emails, notifications, batch sends
Receiving emails	`resend-inbound`	Processing inbound emails, webhooks for received mail, attachments
AI Agent inbox	`agent-email-inbox`	Setting up email for AI agents, or any system where untrusted email content triggers actions — includes security measures against prompt injection

Quick Routing

Need to send emails? Use send-email skill

Single or batch transactional emails
Attachments, scheduling, templates
Delivery webhooks (bounced, delivered, opened)

Need to receive emails? Use resend-inbound skill

Setting up inbound domain (MX records)
Processing email.received webhooks
Retrieving email content and attachments
Forwarding received emails

Setting up an AI agent inbox? Use agent-email-inbox skill

Configuring email for Moltbot/Clawdbot or similar AI agents
Webhook setup with ngrok/tunneling for local development
Security levels to prevent prompt injection attacks
Trusted sender allowlists and content filtering

Automated system processes untrusted email content and takes actions? Use agent-email-inbox skill

Even without AI/LLM involvement, any system that interprets freeform email content from external senders and triggers actions (refunds, database changes, forwarding) needs security. Untrusted input triggering actions = attack vector.

Sending + receiving together? You need both resend-inbound and send-email

Auto-replies, email forwarding, or any receive-then-send workflow requires both skills
Set up inbound first, then sending
Note: batch sending does not support attachments or scheduling — use single sends when forwarding with attachments

Marketing emails or newsletters? Use Resend Broadcasts

The sub-skills above are for transactional email. Marketing campaigns to large subscriber lists with unsubscribe links and engagement tracking should use Resend Broadcasts, not batch sending.

Common Setup

API Key

Store in environment variable:

export RESEND_API_KEY=re_xxxxxxxxx

SDK Installation

See send-email skill for installation instructions across all supported languages.