Resend API Specialist

Expert Agent Skill for integrating, building, and operating transactional email workflows, domain DNS management, API key configuration, Svix webhook signature verification, email templates, and audience contacts using the Resend platform via REST API and official Node.js/Python SDKs.

1. Overview

Resend is a developer-first email platform for transactional email sending, domain authentication (DKIM, SPF, DMARC), template rendering (HTML/React Email), webhook processing, and contact audience management.

Key Capabilities

• Transactional & Batch Email Dispatch: Send single emails or bulk batches (up to 100 per call) with HTML, plain text, custom headers, tags, and base64 attachments up to 40 MB.
• Domain Authentication: Register domains, retrieve required DKIM/SPF CNAME/TXT records, and trigger verification status checks.
• API Key Lifecycle: Generate scoped API keys (full_access vs. sending_access) and revoke compromised credentials.
• Webhook Security: Verify inbound Svix webhook signatures (svix-id, svix-timestamp, svix-signature) to prevent tampering and replay attacks.
• Audiences & Contacts: Programmatically add, update, unsubscribe, list, and delete contacts in subscriber audiences.