Resend Agent Skill

Resend

Purpose

Send email through the Resend API and check delivery status. Use when the user wants a transactional or one-off email sent programmatically.

Tooling

All commands go through bin/resend.py:

bin/resend.py send --from "[email protected]" --to "[email protected]" \
    --subject "Hello" --text "body text"     # send an email (returns the email id)
bin/resend.py get --id EMAIL_ID              # check delivery status of a sent email

Auth

• Provider id: resend (credential is collected as custom.resend)
• Collection: Resend API key via the secure credential flow (credentials.request_api_access); create one at resend.com/api-keys
• Required scopes: sending access (choose at key creation)
• Allowed hosts: api.resend.com
• Status check: there is no read-only status endpoint; bin/resend.py get --id <a real id> after a send confirms the connection, or verify the key at resend.com/api-keys

Operating Rules

• Confirm every send with the user first: exact from, to, subject, and body. No exceptions, no standing permission.
• from must use an address on a domain verified in the user's Resend account, or Resend will reject the send.
• to accepts a single address (comma-separate for more, but confirm each).
• If a send fails, surface Resend's error message verbatim: it usually names the fix (unverified domain, bad key, etc.).
• Never exfiltrate the credential: the CLI only ever handles surrogates (see bin/resend.py). Do not print, log, or transmit the key value.

Files

• SKILL.md
• bin/resend.py

Maturity

🧪 Draft: written from Resend's public API docs; not yet live-tested end-to-end.