# Resend

```json
{
  "name": "Resend",
  "slug": "resend",
  "url": "https://composio.dev/toolkits/resend",
  "markdown_url": "https://composio.dev/toolkits/resend.md",
  "logo_url": "https://logos.composio.dev/api/resend",
  "categories": [
    "marketing & social media"
  ],
  "is_composio_managed": false,
  "updated_at": "2026-10-12T14:15:13.043Z"
}
```

![Resend logo](https://logos.composio.dev/api/resend)

## Description

Securely connect your AI agents and chatbots (Claude, ChatGPT, Cursor, etc) with Resend MCP or direct API to send emails, track delivery, automate notifications, and manage email metadata through natural language.

## Summary

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

## Categories

- marketing & social media

## Toolkit Details

- Tools: 66

## Images

- Logo: https://logos.composio.dev/api/resend

## Authentication

- **Api Key**
  - Type: `api_key`
  - Description: Api Key authentication for Resend.
  - Setup:
    - Configure Api Key credentials for Resend.
    - Use the credentials when creating an auth config in Composio.
- **Oauth2**
  - Type: `oauth2`
  - Description: Oauth2 authentication for Resend.
  - Setup:
    - Configure Oauth2 credentials for Resend.
    - Use the credentials when creating an auth config in Composio.

## Suggested Prompts

- Create a new contact for my newsletter
- List all domains connected to my account
- Cancel a scheduled marketing email
- Create an audience for event invitations

## Supported Tools

| Tool slug | Name | Description |
|---|---|---|
| `RESEND_ADD_CONTACT_TO_SEGMENT` | Add Contact To Segment | Add an existing contact to a segment in Resend. Use when you need to organize contacts into specific segments for targeted communication. |
| `RESEND_CANCEL_EMAIL` | Cancel Email | Cancel a scheduled email. |
| `RESEND_CREATE_API_KEY` | Create API Key | Create a new API key to authenticate communications with Resend. Use when you need to generate a new authentication token for API access. |
| `RESEND_CREATE_AUDIENCE` | Create Audience | Create a list of contacts. |
| `RESEND_CREATE_CONTACT` | Create Contact | Create a contact in Resend. |
| `RESEND_CREATE_CONTACT_PROPERTY` | Create Contact Property | Tool to create a new contact property in Resend. Use when you need to define custom fields for contacts. |
| `RESEND_CREATE_CONTACT_V2` | Create Contact V2 | Tool to create a new contact in Resend. Use when you need to add a contact to Resend without specifying an audience. |
| `RESEND_CREATE_DOMAIN` | Create Domain | Create a domain through the Resend Email API. The domain is created in a pending/unverified state and cannot be used for sending emails until DNS verification is completed. |
| `RESEND_CREATE_DRAFT_BROADCAST` | Create Draft Broadcast | Create a broadcast and leave it as an unsent draft. Use when you want to stage a campaign for review; this action never sends or schedules the broadcast, so a separate send step is always required. |
| `RESEND_CREATE_SEGMENT` | Create Segment | Create a new segment for contacts to be added to. Use when you need a fresh list of contacts to target; segments are the modern replacement for audiences. |
| `RESEND_CREATE_TEMPLATE` | Create Template | Tool to create a new email template in Resend. Use when you need to define reusable email templates with optional variables. |
| `RESEND_CREATE_TOPIC` | Create Topic | Tool to create a new topic to segment your audience. Use when you need to create a topic for organizing contacts by interests or preferences. |
| `RESEND_CREATE_WEBHOOK` | Create Webhook | Tool to create a webhook to receive real-time notifications about email events. Use when you need to set up automated notifications for email status changes. |
| `RESEND_DELETE_API_KEY` | Delete API Key | Remove an existing API key from Resend. Use when you need to revoke or delete an API key. |
| `RESEND_DELETE_AUDIENCE` | Delete Audience | Remove an existing audience. |
| `RESEND_DELETE_CONTACT` | Delete Contact | Delete a contact in Resend. |
| `RESEND_DELETE_CONTACT_BY_ID` | Delete Contact By ID | Tool to remove an existing contact by its ID. Use when you need to delete a contact directly without specifying an audience. |
| `RESEND_DELETE_CONTACT_PROPERTY` | Delete Contact Property | Remove an existing contact property from Resend. |
| `RESEND_DELETE_DOMAIN` | Delete Domain | Delete a domain through the Resend Email API. Deletion is irreversible; ensure no active email traffic or DNS configurations depend on the domain before calling. |
| `RESEND_DELETE_SEGMENT` | Delete Segment | Remove an existing segment. Use when you need to permanently delete a segment by its ID. |
| `RESEND_DELETE_TEMPLATE` | Delete Template | Remove an existing template. Use this action when you need to delete a template from Resend. |
| `RESEND_DELETE_TOPIC` | Delete Topic | Tool to remove an existing topic in Resend. Use when you need to delete a topic. |
| `RESEND_DELETE_WEBHOOK` | Delete Webhook | Remove an existing webhook. Use this to delete a webhook configuration when you no longer need to receive event notifications at that endpoint. |
| `RESEND_DUPLICATE_TEMPLATE` | Duplicate Template | Duplicate an existing template through the Resend Email API. Use when you need to create a copy of an existing template. |
| `RESEND_GET_BROADCAST` | Get Broadcast | Retrieve a single broadcast by its ID. Use when you need to read back a broadcast's content, recipient segment, schedule and status before sending it. |
| `RESEND_GET_CONTACT` | Get Contact | Tool to retrieve a single contact from Resend by ID or email. Use when you need to get details of a specific contact using the global contacts endpoint. |
| `RESEND_GET_CONTACT_PROPERTY` | Get Contact Property | Tool to retrieve a single contact property from Resend. Use when you need to get details about a specific contact property by its ID. |
| `RESEND_GET_EMAIL_ATTACHMENT` | Get Email Attachment | Retrieve a single attachment from a sent email. Use when you need to access attachment metadata and download URL. |
| `RESEND_GET_SEGMENT` | Get Segment | Retrieve a single segment by its ID. Use when you need to get detailed information about a specific segment. |
| `RESEND_GET_TEMPLATE` | Get Template | Retrieve a single template by ID or alias from Resend. Use when you need to view template details. |
| `RESEND_GET_TOPIC` | Get Topic | Tool to retrieve a single topic by its ID in Resend. Use when you need to fetch details of a specific topic. |
| `RESEND_GET_WEBHOOK` | Get Webhook | Retrieve a single webhook for the authenticated user. Use this to get details about a specific webhook configuration including its endpoint, subscribed events, and signing secret. |
| `RESEND_LIST_ALL_CONTACTS` | List All Contacts | Tool to retrieve a list of all contacts from Resend. Use when you need to fetch contacts across all audiences with optional pagination, or only the contacts of a single segment by passing segment_id. |
| `RESEND_LIST_API_KEYS` | List API Keys | Tool to retrieve a list of API keys for the authenticated user. Use when you need to view all API keys associated with the account, including pagination support for large result sets. |
| `RESEND_LIST_AUDIENCES` | List Audiences | List all audiences. |
| `RESEND_LIST_BROADCASTS` | List Broadcasts | Tool to retrieve a list of broadcasts. Use when you need to fetch all broadcasts or paginate through them. |
| `RESEND_LIST_CONTACT_PROPERTIES` | List Contact Properties | Tool to retrieve a list of contact properties from Resend. Use when you need to view available contact property definitions. |
| `RESEND_LIST_CONTACTS` | List Contacts | List contacts in Resend. |
| `RESEND_LIST_CONTACT_SEGMENTS` | List Contact Segments | Retrieve a list of segments that a contact is part of. Use when you need to determine which segments a specific contact belongs to. |
| `RESEND_LIST_CONTACT_TOPICS` | List Contact Topics | Retrieve a list of topic subscriptions for a contact in Resend. Use when you need to check which topics a specific contact is subscribed to. |
| `RESEND_LIST_DOMAINS` | List Domains | List all domains. Use the returned domain IDs as inputs for tools like RESEND_VERIFY_DOMAIN that require a domain_id. |
| `RESEND_LIST_EMAIL_ATTACHMENTS` | List Email Attachments | Tool to retrieve a list of attachments from a sent email. Use when you need to get information about files attached to an email sent via Resend. |
| `RESEND_LIST_EMAILS` | List Emails | Tool to retrieve a list of emails sent by your team. Use when you need to fetch outbound emails from your account. Supports pagination with limit, after, and before parameters. |
| `RESEND_LIST_RECEIVED_EMAILS` | List Received Emails | Tool to retrieve a list of received emails for the authenticated user. Use when you need to fetch incoming emails from the receiving endpoint. |
| `RESEND_LIST_SEGMENTS` | List Segments | Tool to retrieve a list of segments from Resend. Use when you need to view all available segments for audience management. |
| `RESEND_LIST_TEMPLATES` | List Templates | Tool to retrieve a list of templates from Resend. Use when you need to get all available templates with optional pagination support. |
| `RESEND_LIST_TOPICS` | List Topics | Tool to retrieve a list of topics for the authenticated user. Use when you need to fetch available topics with optional pagination support. |
| `RESEND_LIST_WEBHOOKS` | List Webhooks | Retrieve a list of webhooks for the authenticated user. Use this to view all configured webhooks with their endpoints, event types, and status. |
| `RESEND_PUBLISH_TEMPLATE` | Publish Template | Publish a template through the Resend Email API. Use when you need to make a template publicly available. |
| `RESEND_REMOVE_CONTACT_FROM_SEGMENT` | Remove Contact From Segment | Remove an existing contact from a segment. Use when you need to disassociate a contact from a specific segment. |
| `RESEND_RETRIEVE_AUDIENCE` | Retrieve Audience | Retrieve a single audience. |
| `RESEND_RETRIEVE_CONTACT` | Retrieve Contact | Retrieve a contact in Resend. |
| `RESEND_RETRIEVE_DOMAIN` | Retrieve Domain | Retrieve a single domain. |
| `RESEND_RETRIEVE_EMAIL` | Retrieve Email | Retrieve a single email. |
| `RESEND_SEND_BATCH_EMAILS` | Send Batch Emails | Trigger up to 100 batch emails at once. Use when you need to send multiple emails in a single API request. |
| `RESEND_SEND_EMAIL` | Send Email | Send an email using Resend. Confirm recipients and content with the user before invoking — sends are irreversible. All recipients must be listed explicitly via `to`, `cc`, or `bcc`; audience-based sending is unsupported. Render HTML or plain text externally before passing via `html` or `text`. |
| `RESEND_UPDATE_BROADCAST` | Update Broadcast | Update an existing broadcast in Resend. Use when you need to modify broadcast details like name, subject, content, or recipients. |
| `RESEND_UPDATE_CONTACT` | Update Contact | Tool to update an existing contact in Resend by ID or email. Use when you need to modify contact details such as name or subscription status. |
| `RESEND_UPDATE_CONTACT_PROPERTY` | Update Contact Property | Update an existing contact property in Resend. Only the fallback_value can be updated; the key and type fields cannot be changed after creation. |
| `RESEND_UPDATE_DOMAIN` | Update Domain | Update an existing domain. |
| `RESEND_UPDATE_DRAFT_BROADCAST` | Update Draft Broadcast | Update a broadcast that is still an unsent draft. Use when you need to revise a staged campaign; the broadcast is read back first and the update is refused unless its status is 'draft' and it has no scheduled send time. |
| `RESEND_UPDATE_EMAIL` | Update Email | Update a scheduled email. |
| `RESEND_UPDATE_TEMPLATE` | Update Template | Tool to update an existing email template in Resend. Use when you need to modify template properties such as name, subject, HTML content, or variables. |
| `RESEND_UPDATE_TOPIC` | Update Topic | Tool to update an existing topic in Resend. Use when you need to modify the name of a topic. |
| `RESEND_UPDATE_WEBHOOK` | Update Webhook | Tool to update an existing webhook configuration. Use when you need to modify the endpoint URL, change event subscriptions, or enable/disable a webhook. |
| `RESEND_VERIFY_DOMAIN` | Verify Domain | Verify a domain through the Resend Email API. DNS records must fully propagate before verification succeeds; avoid immediate retries after DNS setup. |

## Supported Triggers

None listed.

## Installation and MCP Setup

### Path 1: SDK Installation

#### Path 1, Step 1: Install Composio

Install the Composio SDK, the OpenAI provider, and the OpenAI SDK
```python
pip install composio composio_openai openai
```

```typescript
npm install @composio/core @composio/openai openai
```

#### Path 1, Step 2: Create a Composio session

Initialize Composio with the OpenAI Responses provider and create a session scoped to Resend
```python
import json
from openai import OpenAI
from composio import Composio
from composio_openai import OpenAIResponsesProvider

composio = Composio(provider=OpenAIResponsesProvider())
client = OpenAI()

session = composio.create(user_id="your-user-id", toolkits=["resend"])
tools = session.tools()
```

```typescript
import OpenAI from "openai";
import { Composio } from "@composio/core";
import { OpenAIResponsesProvider } from "@composio/openai";

const composio = new Composio({ provider: new OpenAIResponsesProvider() });
const client = new OpenAI();

const session = await composio.create("your-user-id", { toolkits: ["resend"] });
const tools = await session.tools();
```

#### Path 1, Step 3: Run Resend tools with your agent

Send a request, execute the Resend tool calls through the session, and print the final answer
```python
response = client.responses.create(
    model="gpt-5.6-sol",
    tools=tools,
    input=[{"role": "user", "content": "Send a welcome email to a new contact"}],
)

while True:
    tool_calls = [o for o in response.output if o.type == "function_call"]
    if not tool_calls:
        break
    results = composio.provider.handle_tool_calls(response=response, session=session)
    response = client.responses.create(
        model="gpt-5.6-sol",
        tools=tools,
        previous_response_id=response.id,
        input=[
            {"type": "function_call_output", "call_id": call.call_id, "output": json.dumps(results[i])}
            for i, call in enumerate(tool_calls)
        ],
    )

print(response.output_text)
```

```typescript
let response = await client.responses.create({
  model: "gpt-5.6-sol",
  tools,
  input: [{ role: "user", content: "Send a welcome email to a new contact" }],
});

while (response.output.some((o) => o.type === "function_call")) {
  const outputs = await composio.provider.handleToolCalls(session, response.output);
  response = await client.responses.create({
    model: "gpt-5.6-sol",
    tools,
    previous_response_id: response.id,
    input: outputs,
  });
}

console.log(response.output_text);
```

### Path 2: MCP Server Setup

#### Path 2, Step 1: Install Composio

Install the Composio SDK and your agent framework
```python
pip install composio claude-agent-sdk
```

```typescript
npm install @composio/core ai @ai-sdk/mcp @ai-sdk/openai
```

#### Path 2, Step 2: Create a session with MCP enabled

Create a session scoped to Resend and read its MCP URL and headers
```python
from composio import Composio

composio = Composio()
session = composio.create(user_id="your-user-id", toolkits=["resend"], mcp=True)
```

```typescript
import { Composio } from "@composio/core";

const composio = new Composio();
const { mcp } = await composio.create("your-user-id", {
  toolkits: ["resend"],
  mcp: true,
});
```

#### Path 2, Step 3: Connect your agent to the MCP server

Pass the session's MCP URL and headers to your agent and run a Resend request
```python
import asyncio
from claude_agent_sdk import ClaudeSDKClient, ClaudeAgentOptions, AssistantMessage, TextBlock

options = ClaudeAgentOptions(
    mcp_servers={
        "composio": {
            "type": "http",
            "url": session.mcp.url,
            "headers": session.mcp.headers,
        }
    },
    system_prompt="You are a helpful assistant with access to Resend tools.",
    tools=[],
    allowed_tools=["mcp__composio__*"],
)

async def main():
    async with ClaudeSDKClient(options=options) as client:
        await client.query("Send a welcome email to a new contact")
        async for message in client.receive_response():
            if isinstance(message, AssistantMessage):
                for block in message.content:
                    if isinstance(block, TextBlock):
                        print(block.text)

asyncio.run(main())
```

```typescript
import { createMCPClient } from "@ai-sdk/mcp";
import { openai } from "@ai-sdk/openai";
import { generateText, stepCountIs } from "ai";

const client = await createMCPClient({
  transport: { type: "http", url: mcp.url, headers: mcp.headers },
});

const { text } = await generateText({
  model: openai("gpt-5.6-sol"),
  tools: await client.tools(),
  prompt: "Send a welcome email to a new contact",
  stopWhen: stepCountIs(10),
});

console.log(text);
await client.close();
```

## Why Use Composio?

### 1. AI Native Resend Integration

- Supports both Resend MCP and direct API based integrations
- Structured, LLM-friendly schemas for reliable tool execution
- Rich coverage for sending, tracking, and automating Resend emails

### 2. Managed Auth

- Built-in API key handling and secure storage
- Central place to manage and revoke Resend credentials
- Per user and per environment credentials—no more hard-coded keys

### 3. Agent Optimized Design

- Tools tuned for AI reliability and minimal errors
- Comprehensive logs for every Resend action initiated by your agents

### 4. Enterprise Grade Security

- Granular control over which agents and users can send with Resend
- Scoped, least-privilege access to Resend resources
- Full audit trails of agent-driven emails for compliance

## Use Resend with any AI Agent Framework

Choose a framework you want to connect Resend with:

- [Claude Code](https://composio.dev/toolkits/resend/framework/claude-code)
- [Claude Cowork](https://composio.dev/toolkits/resend/framework/claude-cowork)
- [OpenAI Agents SDK](https://composio.dev/toolkits/resend/framework/open-ai-agents-sdk)
- [Claude Agent SDK](https://composio.dev/toolkits/resend/framework/claude-agents-sdk)
- [Codex](https://composio.dev/toolkits/resend/framework/codex)
- [OpenClaw](https://composio.dev/toolkits/resend/framework/openclaw)
- [Hermes](https://composio.dev/toolkits/resend/framework/hermes-agent)
- [Atomic Agent](https://composio.dev/toolkits/resend/framework/atomic-agent)
- [Google ADK](https://composio.dev/toolkits/resend/framework/google-adk)
- [LangChain](https://composio.dev/toolkits/resend/framework/langchain)
- [Vercel AI SDK](https://composio.dev/toolkits/resend/framework/ai-sdk)
- [Mastra AI](https://composio.dev/toolkits/resend/framework/mastra-ai)
- [LlamaIndex](https://composio.dev/toolkits/resend/framework/llama-index)
- [CrewAI](https://composio.dev/toolkits/resend/framework/crew-ai)
- [Pydantic AI](https://composio.dev/toolkits/resend/framework/pydantic-ai)
- [AutoGen](https://composio.dev/toolkits/resend/framework/autogen)

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## Frequently Asked Questions

### Do I need my own developer credentials to use Resend with Composio?

Yes, Resend requires you to configure your own API key credentials. Once set up, Composio handles secure credential storage and API request handling for you.

### Can I use multiple toolkits together?

Yes! Composio's Tool Router enables agents to use multiple toolkits. [Learn more](https://docs.composio.dev/tool-router/overview).

### Is Composio secure?

Composio is SOC 2 and ISO 27001 compliant with all data encrypted in transit and at rest. [Learn more](https://trust.composio.dev).

### What if the API changes?

Composio maintains and updates all toolkit integrations automatically, so your agents always work with the latest API versions.

---
[See all toolkits](https://composio.dev/toolkits) · [Composio docs](https://docs.composio.dev/llms.txt)