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How to connect Resend to Claude

Connect Claude Web, Desktop and Cowork to Resend MCP. Create a new contact for your newsletter, list all domains connected to your account, and more using natural language, with authentication handled for you.

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Resend is a universal API for sending emails using a single, modern endpoint. It streamlines transactional and marketing email delivery for developers and teams.

62 Tools

Introduction

Claude is Anthropic's AI assistant, available on the web, in the desktop app, and on mobile. Cowork is its agent for knowledge work, and it runs on all of those surfaces too. Connected to your apps, Claude can work with your files and services to accomplish complex tasks on your behalf.

This guide walks you through the easiest and most secure way to connect your Resend account to Claude via Composio Connect, enabling it to create a new contact for your newsletter, list all domains connected to your account, cancel a scheduled marketing email, and more such actions on your behalf without compromising your account security.

Setup is the same on Claude Web, Desktop, and Cowork, and you only need to do it once. The connector is tied to your account, so it's available in all three.

Also integrate Resend with

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Connecting Resend to Claude Web, Desktop, and Cowork

Two ways to add the Composio connector. Pick whichever you prefer.

1. Add with one click

Click the button. Claude opens with the Composio connector filled in. Click Add, then go to step 2.

Add to Claude

Add manually

In Claude Desktop, click Customize in the left sidebar, then select Connectors and click the + icon at the top.

Claude Desktop connectors screen with Add custom connector selected

Click Add custom connector and paste in the Composio MCP server URL:

bash
https://connect.composio.dev/mcp
Add custom connector dialog with Composio MCP server URL

2. Authorize in your browser

Click Connect. You'll be redirected to a browser window where you can authorize Composio to continue.

Composio authorization screen for Claude Web, Desktop, and Cowork

3. Connect your Resend account

Back in Claude, ask it to connect to Resend or give it any Resend-related task.

For example, ask Claude to:

  • "Create a new contact for your newsletter"
  • "List all domains connected to your account"
  • "Cancel a scheduled marketing email"

It will prompt you to authenticate and authorize access.

That's it. Composio's tools are now available in Claude, and your Resend account is ready to use.

What is the Resend Claude Connector, and what's possible with it?

The Resend MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Resend account. It provides structured and secure access to your email sending and contact management capabilities, so your agent can perform actions like sending emails, managing audiences, creating domains, and handling contacts on your behalf.

  • Automated email delivery and scheduling: Ask your agent to send emails instantly or schedule them for later, and even cancel scheduled messages if needed.
  • Audience and contact management: Let your agent create, list, or delete audiences and individual contacts, keeping your recipient lists organized without manual effort.
  • Domain administration: Easily have your agent set up, list, or remove email sending domains, streamlining onboarding or maintenance for your email infrastructure.
  • Seamless recipient segmentation: Direct your agent to group contacts into audiences for targeted campaigns or communications, improving personalization and reach.
  • Bulk operations and cleanups: Enable your agent to quickly list, update, or delete multiple contacts, audiences, or domains to maintain a tidy and up-to-date email system.

Troubleshooting

1. Why does Claude not use the Composio connector for Resend?

The connector can show as connected, but Claude must use it in each Resend conversation.

  • Click + at the lower left of the chat, or type /.
  • Hover Connectors.
  • Turn on Composio.
  • Ask Claude to connect to Resend again.

2. Why does Claude show an MCP server error before Resend connects?

Claude can show Couldn't reach the MCP server or Authorization with the MCP server failed when you add the connector for Resend.

  • Check that the connector URL is https://connect.composio.dev/mcp.
  • Connectors run from Anthropic's cloud, so your device network is usually not the problem.
  • Add the connector again from Customize > Connectors, then ask Claude to connect Resend.
  • If it fails again, send the error and the ofid_ reference id to support@composio.dev.

3. Why does the Resend authorization link not work?

The Composio connector is one server. Your Resend account connects separately when Claude asks for it.

  • If the browser does not open, or the link expires, ask Claude to retry the Resend connection.
  • Composio creates a fresh Resend authorization link.
  • Open that link in your browser and finish the Resend sign-in.

4. Why do Resend actions fail after they worked before?

The Resend connection can expire or lose permission.

  • Ask Claude to inspect the Resend connection.
  • If the connection is unhealthy, disconnect it when Claude prompts you.
  • Reconnect the Resend account and retry the action.
  • If Claude shows a permission prompt, approve it before Claude changes data in Resend.
  • If the action still fails with a permission error, check that the connected account has that permission in Resend itself.

5. How do I switch to a different Resend account?

Claude can manage the Resend connection for you.

  • Ask Claude to disconnect or delete the current Resend account.
  • Ask Claude to connect Resend again.
  • Open the new Composio authorization link for Resend.
  • Sign in with the other Resend account in the browser.
  • After the account connects, ask Claude to retry the Resend task.

6. Why is my Resend connection missing in Claude Desktop or on a Team plan?

The connector belongs to your Claude account, so your Resend connection works in Claude Web, Desktop, and Cowork.

  • In Claude Desktop, open Customize > Connectors.
  • Next to Composio, click ⋮ and click Clear cache.
  • If Resend tools still do not appear, click ⋮, disconnect, remove the connector, and add it again.
  • On Team or Enterprise, an Owner or Primary Owner must enable the connector before you can connect Resend.
TOOLS

Supported Tools

Every Resend action and event your agent gets out of the box.

Add Contact To Segment

Add an existing contact to a segment in Resend.

Cancel Email

Cancel a scheduled email.

Create API Key

Create a new API key to authenticate communications with Resend.

Create Audience

Create a list of contacts.

Create Contact

Create a contact in Resend.

Create Contact Property

Tool to create a new contact property in Resend.

Create Contact V2

Tool to create a new contact in Resend.

Create Domain

Create a domain through the Resend Email API.

Create Template

Tool to create a new email template in Resend.

Create Topic

Tool to create a new topic to segment your audience.

Create Webhook

Tool to create a webhook to receive real-time notifications about email events.

Delete API Key

Remove an existing API key from Resend.

Delete Audience

Remove an existing audience.

Delete Contact

Delete a contact in Resend.

Delete Contact By ID

Tool to remove an existing contact by its ID.

Delete Contact Property

Remove an existing contact property from Resend.

Delete Domain

Delete a domain through the Resend Email API.

Delete Segment

Remove an existing segment.

Delete Template

Remove an existing template.

Delete Topic

Tool to remove an existing topic in Resend.

Delete Webhook

Remove an existing webhook.

Duplicate Template

Duplicate an existing template through the Resend Email API.

Get Contact

Tool to retrieve a single contact from Resend by ID or email.

Get Contact Property

Tool to retrieve a single contact property from Resend.

Get Email Attachment

Retrieve a single attachment from a sent email.

Get Segment

Retrieve a single segment by its ID.

Get Template

Retrieve a single template by ID or alias from Resend.

Get Topic

Tool to retrieve a single topic by its ID in Resend.

Get Webhook

Retrieve a single webhook for the authenticated user.

List All Contacts

Tool to retrieve a list of all contacts from Resend.

List API Keys

Tool to retrieve a list of API keys for the authenticated user.

List Audiences

List all audiences.

List Broadcasts

Tool to retrieve a list of broadcasts.

List Contact Properties

Tool to retrieve a list of contact properties from Resend.

List Contacts

List contacts in Resend.

List Contact Segments

Retrieve a list of segments that a contact is part of.

List Contact Topics

Retrieve a list of topic subscriptions for a contact in Resend.

List Domains

List all domains.

List Email Attachments

Tool to retrieve a list of attachments from a sent email.

List Emails

Tool to retrieve a list of emails sent by your team.

List Received Emails

Tool to retrieve a list of received emails for the authenticated user.

List Segments

Tool to retrieve a list of segments from Resend.

List Templates

Tool to retrieve a list of templates from Resend.

List Topics

Tool to retrieve a list of topics for the authenticated user.

List Webhooks

Retrieve a list of webhooks for the authenticated user.

Publish Template

Publish a template through the Resend Email API.

Remove Contact From Segment

Remove an existing contact from a segment.

Retrieve Audience

Retrieve a single audience.

Retrieve Contact

Retrieve a contact in Resend.

Retrieve Domain

Retrieve a single domain.

Retrieve Email

Retrieve a single email.

Send Batch Emails

Trigger up to 100 batch emails at once.

Send Email

Send an email using Resend.

Update Broadcast

Update an existing broadcast in Resend.

Update Contact

Tool to update an existing contact in Resend by ID or email.

Update Contact Property

Update an existing contact property in Resend.

Update Domain

Update an existing domain.

Update Email

Update a scheduled email.

Update Template

Tool to update an existing email template in Resend.

Update Topic

Tool to update an existing topic in Resend.

Update Webhook

Tool to update an existing webhook configuration.

Verify Domain

Verify a domain through the Resend Email API.

FRAMEWORKS

How to build Resend MCP Agent with another framework

Claude Code logo

Claude Code

Use Resend MCP with Claude Code

OpenAI Agents SDK logo

OpenAI Agents SDK

Use Resend MCP with OpenAI Agents SDK

Claude Agent SDK logo

Claude Agent SDK

Use Resend MCP with Claude Agent SDK

Codex logo

Codex

Use Resend MCP with Codex

OpenClaw logo

OpenClaw

Use Resend MCP with OpenClaw

Hermes logo

Hermes

Use Resend MCP with Hermes

Atomic Agent logo

Atomic Agent

Use Resend MCP with Atomic Agent

Google ADK logo

Google ADK

Use Resend MCP with Google ADK

LangChain logo

LangChain

Use Resend MCP with LangChain

Vercel AI SDK logo

Vercel AI SDK

Use Resend MCP with Vercel AI SDK

Mastra AI logo

Mastra AI

Use Resend MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use Resend MCP with LlamaIndex

CrewAI logo

CrewAI

Use Resend MCP with CrewAI

Pydantic AI logo

Pydantic AI

Use Resend MCP with Pydantic AI

AutoGen logo

AutoGen

Use Resend MCP with AutoGen

FAQ

Frequently asked questions

With a standalone Resend MCP server, the agents and LLMs can only access a fixed set of Resend tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Resend and many other apps based on the task at hand, all through a single MCP endpoint.

Yes, you can. Claude Cowork fully supports MCP integration. You get structured tool calling, message history handling, and model orchestration while Tool Router takes care of discovering and serving the right Resend tools.

Yes, absolutely. You can configure which Resend scopes and actions are allowed when connecting your account to Composio. You can also bring your own OAuth credentials or API configuration so you keep full control over what the agent can do.

All sensitive data such as tokens, keys, and configuration is fully encrypted at rest and in transit. Composio is SOC 2 Type 2 compliant and follows strict security practices so your Resend data and credentials are handled as safely as possible.

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