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How to connect Sendfox to Claude

Connect Claude Web, Desktop and Cowork to Sendfox MCP. List all active campaigns this week, unsubscribe a contact by email address, and more using natural language, with authentication handled for you.

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Sendfox is an email marketing platform focused on simple, affordable campaign management for creators and small businesses. It lets you grow and engage your audience with automated newsletters and easy contact organization.

17 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 Sendfox account to Claude via Composio Connect, enabling it to list all active campaigns this week, unsubscribe a contact by email address, retrieve all contacts from your main list, 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 Sendfox with

Claude CodeOpenAI Agents SDKClaude Agent SDKCodexOpenClawHermesAtomic AgentGoogle ADKLangChainVercel AI SDKMastra AILlamaIndexCrewAIPydantic AIAutoGen

Connecting Sendfox 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 Sendfox account

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

For example, ask Claude to:

  • "List all active campaigns this week"
  • "Unsubscribe a contact by email address"
  • "Retrieve all contacts from your main list"

It will prompt you to authenticate and authorize access.

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

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

The Sendfox MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Sendfox account. It provides structured and secure access to your contact lists, campaigns, automations, and more, so your agent can fetch contacts, manage lists, retrieve campaign data, and automate subscriber actions on your behalf.

  • Contact management and lookup: Instantly retrieve contact details by email or ID, fetch all contacts, or discover specific fields to personalize your outreach.
  • List organization and updates: Ask your agent to fetch all your Sendfox lists, get details for a specific list, or remove contacts from lists as needed.
  • Campaign and automation insights: Effortlessly retrieve paginated lists of campaigns or automations, so you can stay on top of your email marketing performance.
  • Subscription and unsubscribe actions: Let your agent globally unsubscribe a contact or handle opt-outs automatically for better list hygiene.
  • Discover contact field metadata: Pull all available contact fields to help with dynamic contact creation or targeted updates.

Troubleshooting

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

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

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

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

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

  • 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 Sendfox.
  • If it fails again, send the error and the ofid_ reference id to support@composio.dev.

3. Why does the Sendfox authorization link not work?

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

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

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

The Sendfox connection can expire or lose permission.

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

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

Claude can manage the Sendfox connection for you.

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

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

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

  • In Claude Desktop, open Customize > Connectors.
  • Next to Composio, click ⋮ and click Clear cache.
  • If Sendfox 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 Sendfox.
TOOLS

Supported Tools

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

Delete Contact from List

Tool to remove a contact from a specific list in SendFox.

Get Automations

Tool to retrieve a list of automations.

Get Campaign by ID

Retrieve details for a specific campaign by its ID from SendFox.

Get Campaigns

Retrieve a paginated list of email campaigns from SendFox.

Get Contact by ID

Retrieves a contact's details by their unique ID from SendFox.

Get Contact Fields

Retrieves all contact fields available in the SendFox account.

Get Contacts

Tool to retrieve a paginated list of contacts.

Get Contacts in List

Tool to retrieve contacts in a specific list.

Get Current User

Tool to retrieve information about the authenticated user from SendFox.

Get Forms

Tool to retrieve a paginated list of forms from SendFox.

Get List by ID

Retrieves details of a specific contact list by its ID from SendFox.

Get Lists

Retrieve all contact lists from your SendFox account with pagination support.

List Contact Fields

Tool to list all custom contact fields defined by the user.

List Unsubscribed Contacts

Tool to retrieve a paginated list of contacts who have unsubscribed.

Unsubscribe Contact

Unsubscribe a contact from all email communications in your SendFox account.

Create Contact

Create a new contact (subscriber) in your SendFox account.

Create List

Create a new contact list in your SendFox account.

FRAMEWORKS

How to build Sendfox MCP Agent with another framework

Claude Code logo

Claude Code

Use Sendfox MCP with Claude Code

OpenAI Agents SDK logo

OpenAI Agents SDK

Use Sendfox MCP with OpenAI Agents SDK

Claude Agent SDK logo

Claude Agent SDK

Use Sendfox MCP with Claude Agent SDK

Codex logo

Codex

Use Sendfox MCP with Codex

OpenClaw logo

OpenClaw

Use Sendfox MCP with OpenClaw

Hermes logo

Hermes

Use Sendfox MCP with Hermes

Atomic Agent logo

Atomic Agent

Use Sendfox MCP with Atomic Agent

Google ADK logo

Google ADK

Use Sendfox MCP with Google ADK

LangChain logo

LangChain

Use Sendfox MCP with LangChain

Vercel AI SDK logo

Vercel AI SDK

Use Sendfox MCP with Vercel AI SDK

Mastra AI logo

Mastra AI

Use Sendfox MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use Sendfox MCP with LlamaIndex

CrewAI logo

CrewAI

Use Sendfox MCP with CrewAI

Pydantic AI logo

Pydantic AI

Use Sendfox MCP with Pydantic AI

AutoGen logo

AutoGen

Use Sendfox MCP with AutoGen

FAQ

Frequently asked questions

With a standalone Sendfox MCP server, the agents and LLMs can only access a fixed set of Sendfox tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Sendfox 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 Sendfox tools.

Yes, absolutely. You can configure which Sendfox 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 Sendfox data and credentials are handled as safely as possible.

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