ContractSpec docs

OSS-first docs

These docs teach the open system first: contracts, generated surfaces, runtimes, governance, and incremental adoption. Studio shows up as the operating layer on top, not as the source of truth.

AI index

Resend

Resend is a modern email API built for developers. It provides a simple, reliable way to send transactional emails with React Email templates.

Setup

# .env
RESEND_API_KEY=re_...
RESEND_FROM_EMAIL=onboarding@resend.dev

Sending emails

capabilityId: resend-send-email
provider:
  type: resend
  operation: sendEmail

inputs:
  to:
    type: string
  subject:
    type: string
  html:
    type: string
  text:
    type: string
    optional: true
  replyTo:
    type: string
    optional: true

outputs:
  id:
    type: string

Best practices

  • Use React Email for type-safe templates

  • Verify your domain for better deliverability

  • Monitor email analytics in the Resend dashboard

Previous: Postmark

Next: Gmail API