Resend

Resend sends email from your server through one HTTP API (https://api.resend.com), the official SDKs that wrap it, SMTP, the resend CLI or its MCP server, and receives email for your domains through webhooks. Most outcomes come down to a few facts: the API key stays on the server (the API has no CORS on purpose), the from address is on a domain you verified, the Node SDK returns { data, error } instead of throwing, and every retry carries the same idempotency key. Templates as code are the react-email skill (react-email SKILL.md); deliverability, compliance and list practice beyond Resend's own settings are the email-practices skill (email-practices SKILL.md). Any Resend docs page reads as markdown by appending .md to its URL.

Apply only the routes and checks for the selected job. Read a linked skill's named file from its installed folder when available, or from the linked source. Report an unavailable required reference instead of inventing it. [skill-authoring, DISTRIBUTION.md#composing-skills]