How to connect Resend to Claude Cowork

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Introduction

Cowork is Anthropic's AI agent for knowledge work. Think of it as Claude Code for everything else. It works autonomously with your computer, local files, and applications to accomplish complex tasks.

This guide walks you through the easiest and most secure way to connect your Resend account to Cowork 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.

Also integrate Resend with

Connecting Resend to Claude Cowork

1. Open Customize

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

2. Add the Composio MCP server

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

3. 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 Cowork

4. Connect your Resend account

Back in Cowork, ask the agent to connect to Resend or give it any Resend-related task.

For example, ask Cowork 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 Cowork, and your Resend account is ready to use.

What is Claude Cowork?

Claude Cowork is Anthropic's agent for general knowledge work. It can use your computer, files, and connected applications to complete longer-running tasks across your work tools.

With Composio Connect, Cowork can securely access apps like Resend through MCP without you sharing account credentials directly with the agent.

What is the Resend MCP server, 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.

Supported Tools & Triggers

Tools
Cancel EmailCancel a scheduled email.
Create AudienceCreate a list of contacts.
Create ContactCreate a contact in resend.
Create DomainCreate a domain through the resend email api.
Delete AudienceRemove an existing audience.
Delete ContactDelete a contact in resend.
Delete DomainDelete a domain through the resend email api.
List AudiencesList all audiences.
List ContactsList contacts in resend.
List DomainsList all domains.
Retrieve AudienceRetrieve a single audience.
Retrieve ContactRetrieve a contact in resend.
Retrieve DomainRetrieve a single domain.
Retrieve EmailRetrieve a single email.
Send EmailSend an email using resend.
Update DomainUpdate an existing domain.
Update EmailUpdate a scheduled email.
Verify DomainVerify a domain through the resend email api.

How to build Resend MCP Agent with another framework

FAQ

What are the differences in Tool Router MCP and Resend MCP?

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.

Can I use Tool Router MCP with Claude Cowork?

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.

Can I manage the permissions and scopes for Resend while using Tool Router?

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.

How safe is my data with Composio Tool Router?

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.

Used by agents from

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Context
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glean
HubSpot
Agent.ai
Altera
DataStax
Entelligence
Rolai
Context
Letta
glean
HubSpot
Agent.ai
Altera
DataStax
Entelligence
Rolai

Never worry about agent reliability

We handle tool reliability, observability, and security so you never have to second-guess an agent action.