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How to integrate Resend MCP with CrewAI

Connect CrewAI 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.

113 Tools

Introduction

This guide walks you through connecting Resend to CrewAI using the Composio tool router. By the end, you'll have a working Resend agent that can send transactional and batch emails, run broadcasts, manage contacts and segments, verify sending domains, and edit email templates through natural language commands.

This guide will help you understand how to give your CrewAI agent real control over a Resend account through Composio's Resend MCP server.

Before we dive in, let's take a quick look at the key ideas and tools involved.

Also integrate Resend with

Claude CodeClaude CoworkOpenAI Agents SDKClaude Agent SDKCodexOpenClawHermesAtomic AgentGoogle ADKLangChainVercel AI SDKMastra AILlamaIndexPydantic AIAutoGen

TL;DR

Here's what you'll learn:
  • Get a Composio API key and configure your Resend connection
  • Set up CrewAI with an MCP enabled agent
  • Create a Tool Router session or standalone MCP server for Resend
  • Build a conversational loop where your agent can execute Resend operations

What is CrewAI?

CrewAI is a powerful framework for building multi-agent AI systems. It provides primitives for defining agents with specific roles, creating tasks, and orchestrating workflows through crews.

Key features include:

  • Agent Roles: Define specialized agents with specific goals and backstories
  • Task Management: Create tasks with clear descriptions and expected outputs
  • Crew Orchestration: Combine agents and tasks into collaborative workflows
  • MCP Integration: Connect to external tools through Model Context Protocol

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.

What is the Composio tool router, and how does it fit here?

What is Composio SDK?

Composio's Composio SDK helps agents find the right tools for a task at runtime. You can plug in multiple toolkits (like Gmail, HubSpot, and GitHub), and the agent will identify the relevant app and action to complete multi-step workflows. This can reduce token usage and improve the reliability of tool calls. Read more here: Getting started with Composio SDK

The tool router generates a secure MCP URL that your agents can access to perform actions.

How the Composio SDK works

The Composio SDK follows a three-phase workflow:

  1. Discovery: Searches for tools matching your task and returns relevant toolkits with their details.
  2. Authentication: Checks for active connections. If missing, creates an auth config and returns a connection URL via Auth Link.
  3. Execution: Executes the action using the authenticated connection.

Step-by-step Guide

Step by step08 STEPS
1

Prerequisites

Before starting, make sure you have:
  • Python 3.9 or higher
  • A Composio account and API key
  • A Resend connection authorized in Composio
  • An OpenAI API key for the CrewAI LLM
  • Basic familiarity with Python
2

Getting API Keys for OpenAI and Composio

OpenAI API Key
  • Go to the OpenAI dashboard and create an API key. You'll need credits to use the models, or you can connect to another model provider.
  • Keep the API key safe.
Composio API Key
  • Log in to the Composio dashboard.
  • Navigate to your API settings and generate a new API key.
  • Store this key securely as you'll need it for authentication.
3

Install dependencies

bash
pip install composio crewai crewai-tools[mcp] python-dotenv
What's happening:
  • composio connects your agent to Resend via MCP
  • crewai provides Agent, Task, Crew, and LLM primitives
  • crewai-tools[mcp] includes MCP helpers
  • python-dotenv loads environment variables from .env
4

Set up environment variables

bash
COMPOSIO_API_KEY=your_composio_api_key_here
USER_ID=your_user_id_here
OPENAI_API_KEY=your_openai_api_key_here

Create a .env file in your project root.

What's happening:

  • COMPOSIO_API_KEY authenticates with Composio
  • USER_ID scopes the session to your account
  • OPENAI_API_KEY lets CrewAI use your chosen OpenAI model
5

Import dependencies

python
import os
from composio import Composio
from crewai import Agent, Task, Crew
from crewai_tools import MCPServerAdapter
import dotenv

dotenv.load_dotenv()

COMPOSIO_API_KEY = os.getenv("COMPOSIO_API_KEY")
COMPOSIO_USER_ID = os.getenv("COMPOSIO_USER_ID")

if not COMPOSIO_API_KEY:
    raise ValueError("COMPOSIO_API_KEY is not set")
if not COMPOSIO_USER_ID:
    raise ValueError("COMPOSIO_USER_ID is not set")
What's happening:
  • CrewAI classes define agents and tasks, and run the workflow
  • MCPServerHTTP connects the agent to an MCP endpoint
  • Composio will give you a short lived Resend MCP URL
6

Create a Composio Tool Router session for Resend

python
composio_client = Composio(api_key=COMPOSIO_API_KEY)
session = composio_client.create(user_id=COMPOSIO_USER_ID, toolkits=["resend"])

url = session.mcp.url
What's happening:
  • You create a Resend only session through Composio
  • Composio returns an MCP HTTP URL that exposes Resend tools
7

Initialize the MCP Server

python
server_params = {
    "url": url,
    "transport": "streamable-http",
    "headers": {"x-api-key": COMPOSIO_API_KEY},
}

with MCPServerAdapter(server_params) as tools:
    agent = Agent(
        role="Search Assistant",
        goal="Help users search the internet effectively",
        backstory="You are a helpful assistant with access to search tools.",
        tools=tools,
        verbose=False,
        max_iter=10,
    )
What's Happening:
  • Server Configuration: The code sets up connection parameters including the MCP server URL, streamable HTTP transport, and Composio API key authentication.
  • MCP Adapter Bridge: MCPServerAdapter acts as a context manager that converts Composio MCP tools into a CrewAI-compatible format.
  • Agent Setup: Creates a CrewAI Agent with a defined role (Search Assistant), goal (help with internet searches), and access to the MCP tools.
  • Configuration Options: The agent includes settings like verbose=False for clean output and max_iter=10 to prevent infinite loops.
  • Dynamic Tool Usage: Once created, the agent automatically accesses all Composio Search tools and decides when to use them based on user queries.
8

Create a CLI Chatloop and define the Crew

python
print("Chat started! Type 'exit' or 'quit' to end.\n")

conversation_context = ""

while True:
    user_input = input("You: ").strip()

    if user_input.lower() in ["exit", "quit", "bye"]:
        print("\nGoodbye!")
        break

    if not user_input:
        continue

    conversation_context += f"\nUser: {user_input}\n"
    print("\nAgent is thinking...\n")

    task = Task(
        description=(
            f"Conversation history:\n{conversation_context}\n\n"
            f"Current request: {user_input}"
        ),
        expected_output="A helpful response addressing the user's request",
        agent=agent,
    )

    crew = Crew(agents=[agent], tasks=[task], verbose=False)
    result = crew.kickoff()
    response = str(result)

    conversation_context += f"Agent: {response}\n"
    print(f"Agent: {response}\n")
What's Happening:
  • Interactive CLI Setup: The code creates an infinite loop that continuously prompts for user input and maintains the entire conversation history in a string variable.
  • Input Validation: Empty inputs are ignored to prevent processing blank messages and keep the conversation clean.
  • Context Building: Each user message is appended to the conversation context, which preserves the full dialogue history for better agent responses.
  • Dynamic Task Creation: For every user input, a new Task is created that includes both the full conversation history and the current request as context.
  • Crew Execution: A Crew is instantiated with the agent and task, then kicked off to process the request and generate a response.
  • Response Management: The agent's response is converted to a string, added to the conversation context, and displayed to the user, maintaining conversational continuity.

Complete Code

Here's the complete code to get you started with Resend and CrewAI:

python
from crewai import Agent, Task, Crew, LLM
from crewai_tools import MCPServerAdapter
from composio import Composio
from dotenv import load_dotenv
import os

load_dotenv()

GOOGLE_API_KEY = os.getenv("GOOGLE_API_KEY")
COMPOSIO_API_KEY = os.getenv("COMPOSIO_API_KEY")
COMPOSIO_USER_ID = os.getenv("COMPOSIO_USER_ID")

if not GOOGLE_API_KEY:
    raise ValueError("GOOGLE_API_KEY is not set in the environment.")
if not COMPOSIO_API_KEY:
    raise ValueError("COMPOSIO_API_KEY is not set in the environment.")
if not COMPOSIO_USER_ID:
    raise ValueError("COMPOSIO_USER_ID is not set in the environment.")

# Initialize Composio and create a session
composio = Composio(api_key=COMPOSIO_API_KEY)
session = composio.create(
    user_id=COMPOSIO_USER_ID,
    toolkits=["resend"],
)
url = session.mcp.url

# Configure LLM
llm = LLM(
    model="gpt-5",
    api_key=os.getenv("OPENAI_API_KEY"),
)

server_params = {
    "url": url,
    "transport": "streamable-http",
    "headers": {"x-api-key": COMPOSIO_API_KEY},
}

with MCPServerAdapter(server_params) as tools:
    agent = Agent(
        role="Search Assistant",
        goal="Help users with internet searches",
        backstory="You are an expert assistant with access to Composio Search tools.",
        tools=tools,
        llm=llm,
        verbose=False,
        max_iter=10,
    )

    print("Chat started! Type 'exit' or 'quit' to end.\n")

    conversation_context = ""

    while True:
        user_input = input("You: ").strip()

        if user_input.lower() in ["exit", "quit", "bye"]:
            print("\nGoodbye!")
            break

        if not user_input:
            continue

        conversation_context += f"\nUser: {user_input}\n"
        print("\nAgent is thinking...\n")

        task = Task(
            description=(
                f"Conversation history:\n{conversation_context}\n\n"
                f"Current request: {user_input}"
            ),
            expected_output="A helpful response addressing the user's request",
            agent=agent,
        )

        crew = Crew(agents=[agent], tasks=[task], verbose=False)
        result = crew.kickoff()
        response = str(result)

        conversation_context += f"Agent: {response}\n"
        print(f"Agent: {response}\n")

Conclusion

You now have a CrewAI agent connected to Resend through Composio's Tool Router. The agent can perform Resend operations through natural language commands.

Next steps:

  • Add role-specific instructions to customize agent behavior
  • Plug in more toolkits for multi-app workflows
  • Chain tasks for complex multi-step operations
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.

Batch Add Suppressions

Add between 1 and 100 Resend suppressions to prevent sending to those emails.

Batch Remove Suppressions

Remove 1–100 Resend suppressions by email addresses or suppression IDs, but not both.

Cancel Broadcast

Cancel a queued or scheduled broadcast.

Cancel Email

Cancel a scheduled email.

Create API Key

Create a new API key to authenticate communications with Resend.

Create Audience

Create a segment using the legacy audience action and response shape.

Create Automation

Create a Resend automation from workflow steps and connections.

Create Contact

Create a global contact and add it to the segment identified by audienceId.

Create Contact Import

Create a contact import from a CSV file, optionally mapping columns and applying segments and topic subscriptions.

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 Domain Claim

Start a claim for a domain another Resend account has already verified.

Create Draft Broadcast

Create a broadcast and leave it as an unsent draft.

Create Event

Create a Resend event definition, optionally with a typed payload schema.

Create Segment

Create a new segment for contacts to be added to.

Create Suppression

Create a Resend suppression for an email address to prevent sending to it.

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 a segment using the legacy audience action and response shape.

Delete Automation

Remove an existing automation from Resend using its automation ID.

Delete Broadcast

Remove an existing broadcast that is in draft status.

Delete Contact

Remove a contact from the segment identified by audienceId, preserving the global contact.

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 Event

Delete an existing Resend event using its event ID (UUID) or event name.

Delete Segment

Remove an existing segment.

Delete Suppression

Remove a Resend suppression using its suppression ID or email address.

Delete Template

Remove an existing template.

Delete Topic

Delete an existing Resend topic by its topic ID.

Delete Webhook

Remove an existing webhook by ID.

Duplicate Automation

Duplicate an existing automation by its ID and return the new automation's ID.

Duplicate Broadcast

Create a new draft broadcast from an existing broadcast.

Duplicate Template

Duplicate an existing template through the Resend Email API.

Get Automation

Retrieve a Resend automation by ID, including its active workflow steps and connections.

Get Automation Run

Retrieve a Resend automation run by automation and run IDs, including its status and step executions in graph order.

Get Broadcast

Retrieve a single broadcast by its ID.

Get Contact

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

Get Contact Import

Retrieve a contact import by ID to check its status, timestamps, and processed row counts.

Get Contact Property

Tool to retrieve a single contact property from Resend.

Get Domain Claim

Retrieve the latest claim for a placeholder domain created by a claim.

Get Email Attachment

Retrieve a single attachment from a sent email.

Get Email Metrics

Retrieve account-level email metrics over a date range, with optional filters and dimension breakdowns.

Get Event

Retrieve a Resend event definition by UUID or event name.

Get Log

Retrieve a single Resend API log by its ID.

Get Received Email

Retrieve a single received email by ID, including its content, headers, recipients, and attachment metadata.

Get Received Email Attachment

Retrieve a single attachment from a received email, including its metadata and signed download URL.

Get Segment

Retrieve a single segment by its ID.

Get Suppression

Retrieve a Resend suppression by ID or email address.

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 Usage

Retrieve the account's current usage and plan limits for emails, contacts, segments, broadcasts, AI credits, automation runs, domains, and API requests.

Get Webhook

Retrieve a single webhook for the authenticated user.

Get Webhook Event

Retrieve a single webhook event by webhook ID and event ID.

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 segments using the legacy audience action and response shape.

List Automation Runs

Retrieve a page of runs for a Resend automation.

List Automations

Retrieve a page of Resend automations.

List Broadcast Clicked Links

Retrieve one page of a broadcast's clicked URLs and total and unique click counts.

List Broadcast Recipients

Retrieve a page of broadcast recipients filtered by a required event type.

List Broadcasts

Tool to retrieve a list of broadcasts.

List Contact Imports

Retrieve a page of Resend contact imports, optionally filtered by status.

List Contact Properties

Tool to retrieve a list of contact properties from Resend.

List Contacts

List contacts belonging to the segment identified by the legacy audienceId parameter.

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 Events

Retrieve a page of Resend event definitions and their payload schemas.

List Logs

Retrieve a page of Resend API request logs with optional cursor pagination.

List Received Email Attachments

Retrieve a paginated list of attachments for a received email, including metadata and signed download URLs.

List Received Emails

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

List Segments

Retrieve a page of Resend segments for audience management.

List Suppressions

Retrieve a page of suppressed email addresses from Resend, optionally filtered by bounce, complaint, or manual origin.

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 Webhook Event Attempts

Retrieve a page of delivery attempts for an event on a Resend webhook, including HTTP status codes, response bodies, and send timestamps.

List Webhook Events

Retrieve a page of events for a Resend webhook, including delivery status.

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.

Replay Webhook Event

Queue one more delivery of an event to an enabled webhook.

Retrieve Audience

Retrieve a segment using the legacy audience action and response shape.

Retrieve Contact

Retrieve a global contact by ID.

Retrieve Domain

Retrieve a single domain.

Retrieve Email

Retrieve a single email.

Send Batch Emails

Trigger up to 100 batch emails at once.

Send Broadcast

Send an existing Resend broadcast immediately or schedule it for a later ISO 8601 date.

Send Email

Send an email using Resend.

Send Event

Send an event associated with a contact ID or email, with an optional payload.

Share Email

Create a shareable link for a sent or received Resend email.

Stop Automation

Stop an automation by its ID and return its status after stopping.

Update Automation

Update a Resend automation's name, status, or workflow graph.

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 Contact Topics

Update topic subscriptions for a Resend contact by ID or email address.

Update Domain

Update an existing domain's click tracking, open tracking, and TLS settings.

Update Draft Broadcast

Update a broadcast that is still an unsent draft.

Update Email

Update the scheduled send time of a scheduled email by ID.

Update Event

Update a Resend event definition's payload schema by UUID or event name.

Update Segment

Update an existing segment in Resend.

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.

Verify Domain Claim

Trigger asynchronous DNS verification and ownership transfer for a domain claim.

FRAMEWORKS

How to build Resend MCP Agent with another framework

Claude Code logo

Claude Code

Use Resend MCP with Claude Code

Claude Cowork logo

Claude Cowork

Use Resend MCP with Claude Cowork

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

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. CrewAI 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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