Resend

​

At a glance

• Availability: Experimental (how to enable).
• Authentication: API key.
• Connection: The key comes from RESEND_API_KEY.
• Provider documentation: Authentication reference.

​

Credentials

Set these per environment. See Connect an integration.

​

Setup

1. Sign in to Resend: Go to https://resend.com and sign in. The free tier is sufficient for testing.
2. Verify a domain (or use onboarding sender): Add and verify a sending domain under https://resend.com/domains. For quick tests you can send from [email protected] to your own account email.
3. Create an API key: Open https://resend.com/api-keys and create a key with Full Access (Sending Access alone cannot read domains/audiences).
4. Set the environment variable: Add the key to your .env as RESEND_API_KEY=re_…
5. Verify access: Run List Domains to confirm the key works, then send a test email to yourself.

​

Provider notes

• Resend authenticates with ‘Authorization: Bearer re_…’
• Audiences and contacts power Broadcasts; transactional sending only requires a verified domain

Provider API reference.

​

Tools

​

Verify the connection

Call a read tool such as resend__get_email with arguments for your account. Confirm that the result comes from the intended account or workspace before enabling write tools.