Resend for AI agents

Resend is a developer-focused email API for sending transactional and marketing email, managing domains, audiences, contacts, and templates. Connect it once through Arc0, and your agent, or Claude, ChatGPT and Cursor, can use it through one MCP endpoint, limited to what each user approved.

Connect Resend See the 66 actions ↓

EmailAPI keyMCP + RESTresend.com

AUDIT LOG · RESENDPOLICY: acme-support

09:41:07 · claude · u_8f2read

resend.list_emails

List Emails✓ allowed · 212ms

09:41:08 · claude · u_8f2read

resend.get_topic

Get Topic✓ allowed · 164ms

09:41:09 · claude · u_8f2write

resend.create_topic

Create Topic✓ approved · approved by user

09:41:12 · claude · u_8f2destructive

resend.delete_topic

Delete Topic✕ blocked · policy: deny

EVERY RESEND CALL, ON THE RECORD

01 · USE CASES

What agents do in Resend.

Send a broadcast to a segment

Create a draft broadcast for a segment of contacts before it goes out to their inboxes.

Check a domain's setup

Get a domain's verification status before relying on it to send email.

Confirm before deleting an audience

Look up an audience's contacts first, then delete the audience only after confirming it's unused.

02 · ACTIONS

66 Resend actions, graded by risk.

Every Resend action is tagged read, write or destructive, so one policy covers the whole app and new actions inherit the right default.

read

Look things up. Allowed by default.

resend.get_topic
Get Topic
resend.get_contact
Get Contact
resend.get_segment
Get Segment
resend.get_webhook
Get Webhook
resend.list_emails
List Emails
resend.list_topics
List Topics
resend.get_template
Get Template
resend.list_domains
List Domains
resend.get_broadcast
Get Broadcast
resend.list_api_keys
List API Keys
resend.list_contacts
List Contacts
resend.list_segments
List Segments
resend.list_webhooks
List Webhooks
resend.list_audiences
List Audiences
resend.list_templates
List Templates
resend.list_broadcasts
List Broadcasts

+ 13 MORE

write

Create and change things. Allow, or ask the user first.

resend.send_email
Send Email
resend.create_topic
Create Topic
resend.update_email
Update Email
resend.update_topic
Update Topic
resend.create_domain
Create Domain
resend.update_domain
Update Domain
resend.create_api_key
Create API Key
resend.create_contact
Create Contact
resend.create_segment
Create Segment
resend.create_webhook
Create Webhook
resend.update_contact
Update Contact
resend.update_webhook
Update Webhook
resend.create_audience
Create Audience
resend.create_template
Create Template
resend.update_template
Update Template
resend.update_broadcast
Update Broadcast

+ 9 MORE

destructive

Delete, cancel or archive. Ask first, or deny outright.

resend.cancel_email
Cancel Email
resend.delete_topic
Delete Topic
resend.delete_domain
Delete Domain
resend.delete_api_key
Delete API Key
resend.delete_contact
Delete Contact
resend.delete_segment
Delete Segment
resend.delete_webhook
Delete Webhook
resend.delete_audience
Delete Audience
resend.delete_template
Delete Template
resend.delete_contact_by_id
Delete Contact By ID
resend.delete_contact_property
Delete Contact Property
resend.remove_contact_from_segment
Remove Contact From Segment

03 · HOW IT WORKS

Resend in three steps.

01Your users connect ResendThey add their Resend api key on Arc0 Connect, under your brand. It goes straight into the vault.
02You set the rulesReads run, writes like “create Topic” can wait for the user, and “delete Topic” can be denied outright.
03Any agent can actYour agent calls Resend through the Arc0 SDK or MCP, and so can Claude, ChatGPT and Cursor. Every call lands on the audit log.

POLICY.TS

await arc0.policies.set('resend', {
  read: 'allow',
  write: 'ask',        // create_topic
  destructive: 'deny',  // delete_topic
})

# Claude Code: the same connection, one URL
$ claude mcp add --transport http arc0 \
    https://mcp.arc0.ai/u/u_8f2

04 · AUTH AND DATA

How Resend connects.

Users add their Resend api key on Arc0 Connect. It is encrypted in the vault, never shown to the model, and each user can rotate or revoke it at any time.

The same Resend connection serves your agent over MCP and your own backend over REST and the proxy, so a user connects once. How Arc0 handles credentials →

AUTH: API key
CREDENTIALS: Per-tenant encrypted vault
MODEL SEES: Results only, never credentials
AUDIT LOG: Every call, on every plan

05 · WORKS WITH

Use Resend from any agent.

Claude

ChatGPT

Cursor

Codex

VS Code

OpenAI Agents SDK

Claude Agent SDK

Vercel AI SDK

Mastra

LangGraph

06 · RELATED

More email apps.

Elastic Email91 actions Lettr60 actions

Postmark46 actions

Missive40 actions

ALL EMAIL APPS →

07 · FAQ

Resend and Arc0, answered.

Q01

Can I use Resend with Claude, ChatGPT or Cursor?

Yes. Connect Resend to Arc0 once, then add your Arc0 MCP URL to Claude, ChatGPT, Cursor, Claude Code or any other remote-MCP client. Each assistant only gets the Resend actions you allow.

Q02

How do users connect Resend?

Users add their Resend api key on Arc0 Connect. It is encrypted in the vault, never shown to the model, and each user can rotate or revoke it at any time.

Q03

Which Resend actions can my agent take?

66 in total: 29 read, 25 write and 12 destructive, such as “create Topic”. Your policies decide which of them each agent may call.

Q04

Can I stop my agent from deleting things in Resend?

Yes. Actions like “delete Topic” are graded destructive. Set destructive actions to deny, or to ask so the user approves each one, and blocked calls still show up on the audit log.

Q05

Can my own backend call Resend too?

Yes. The same Resend connection is available over REST and through the Arc0 proxy, so your product and your agent share one connection per user.

Get started

Plug Resend into your agent.

Your users connect Resend once, under your brand. Your agent gets 66 actions behind your policies, with every call on the record.

Connect Resend Browse all apps →

Free to build · MCP + REST · Audit log on every plan