# Resend AI integration on Definable

> The universal API for sending emails.

## What this connects

The universal API for sending emails.

Vendor: https://resend.com

## Tools available

**62** tools available. First 12:

- `RESEND_ADD_CONTACT_TO_SEGMENT` — Add Contact To Segment — Add an existing contact to a segment in Resend. Use when you need to organize contacts into specific segments for targeted communication.
- `RESEND_CANCEL_EMAIL` — Cancel Email — Cancel a scheduled email.
- `RESEND_CREATE_API_KEY` — Create API Key — Create a new API key to authenticate communications with Resend. Use when you need to generate a new authentication token for API access.
- `RESEND_CREATE_AUDIENCE` — Create Audience — Create a list of contacts.
- `RESEND_CREATE_CONTACT` — Create Contact — Create a contact in Resend.
- `RESEND_CREATE_CONTACT_PROPERTY` — Create Contact Property — Tool to create a new contact property in Resend. Use when you need to define custom fields for contacts.
- `RESEND_CREATE_CONTACT_V2` — Create Contact V2 — Tool to create a new contact in Resend. Use when you need to add a contact to Resend without specifying an audience.
- `RESEND_CREATE_DOMAIN` — Create Domain — Create a domain through the Resend Email API. The domain is created in a pending/unverified state and cannot be used for sending emails until DNS verification is completed.
- `RESEND_CREATE_TEMPLATE` — Create Template — Tool to create a new email template in Resend. Use when you need to define reusable email templates with optional variables.
- `RESEND_CREATE_TOPIC` — Create Topic — Tool to create a new topic to segment your audience. Use when you need to create a topic for organizing contacts by interests or preferences.
- `RESEND_CREATE_WEBHOOK` — Create Webhook — Tool to create a webhook to receive real-time notifications about email events. Use when you need to set up automated notifications for email status changes.
- `RESEND_DELETE_API_KEY` — Delete API Key — Remove an existing API key from Resend. Use when you need to revoke or delete an API key.

## Auth

Auth schemes: `API_KEY`.

## How agents use Resend

Inside a Definable workflow, Resend is one of the tools the **Distributor specialist** can call. Example coordination patterns:

- **Researcher → Resend** — the Researcher (GPT-5.5) pulls context from Resend (records, threads, documents), synthesises findings, and briefs the rest of the team.
- **Writer → Distributor → Resend** — the Writer (Claude Opus 4.7) drafts copy in brand voice, the Verifier passes it, then the Distributor writes the result into Resend (create record, post message, draft email).
- **Designer / Engineer → Distributor → Resend** — the Designer ships an asset or the Engineer ships a code change, the Distributor delivers it via Resend (attach file, open PR comment, post status).

The Verifier checks every Resend call. On rate limit, schema drift, or auth refresh it self-heals and retries — the workflow completes without manual intervention.

## Categories

- email — https://definable.ai/apps/category/email/
- transactional email — https://definable.ai/apps/category/transactional-email/

## Related

- HTML page: https://definable.ai/apps/resend/
- Same category (email): https://definable.ai/apps/category/email/
- All integrations: https://definable.ai/apps/
- Workflow (multi-agent loop): https://definable.ai/workflow/
- Apps llms.txt index: https://definable.ai/llms-apps.txt