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How to connect Kit to Claude

Connect Claude Web, Desktop and Cowork to Kit MCP. Add new subscriber to your welcome form, create a custom field for subscriber notes, and more using natural language, with authentication handled for you.

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Kit is a platform for creators and developers to automate tasks and publish apps on the Kit App Store. It helps streamline workflows so you can focus on what matters most.

42 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 Kit account to Claude via Composio Connect, enabling it to add new subscriber to your welcome form, create a custom field for subscriber notes, delete an outdated broadcast by its ID, and more such actions on your behalf without compromising your account security.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 Kit with

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

Connecting Kit 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 Kit account

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

For example, ask Claude to:

  • "Add new subscriber to your welcome form"
  • "Create a custom field for subscriber notes"
  • "Delete an outdated broadcast by its ID"

It will prompt you to authenticate and authorize access.

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

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

The Kit MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Kit account. It provides structured and secure access to your subscriber lists, tags, forms, and automations, so your agent can perform actions like managing subscribers, creating tags, updating custom fields, and handling broadcasts on your behalf.

  • Subscriber management and automation: Add new subscribers to forms, remove subscribers, or update their details to keep your audience lists accurate and engaged.
  • Custom field and tag creation: Automatically create, update, or delete custom fields and tags, making it easy to segment and personalize your communications.
  • Webhook and event setup: Set up or remove webhooks so your agent can listen for subscriber or purchase events and trigger automations as needed.
  • Broadcast and campaign control: Delete obsolete broadcasts or manage your messaging campaigns directly through your agent for streamlined outreach.
  • Account insights and configuration: Retrieve detailed account information, including plan details and primary contact, to keep your integrations and automations running smoothly.

Troubleshooting

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

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

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

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

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

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

3. Why does the Kit authorization link not work?

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

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

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

The Kit connection can expire or lose permission.

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

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

Claude can manage the Kit connection for you.

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

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

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

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

Supported Tools

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

Add Subscriber to Form

Add an existing subscriber to a form by their IDs.

Add Subscriber to Form by Email

Tool to add an existing subscriber to a form using their email address.

Create Broadcast

Tool to create a new broadcast (email campaign) to send to subscribers.

Create Custom Field

Tool to create a new custom field for subscriber data.

Create Subscriber

Tool to create a new subscriber or update an existing one (upsert).

Create Tag

Tool to create a new tag in the account.

Create Webhook

Creates a webhook subscription for real-time event notifications.

Delete Broadcast

Tool to delete a specific broadcast.

Delete Custom Field

Tool to delete a specific custom field.

Delete Subscriber

Unsubscribe a subscriber from all email communications by their ID.

Delete Tag

Tool to delete a tag by ID.

Delete Webhook

Tool to delete a webhook by ID.

Filter Subscribers

Tool to filter subscribers based on engagement criteria such as email opens, clicks, or delivery status.

Get Account

Tool to retrieve current account information.

Get Account Colors

Tool to retrieve list of colors associated with the account.

Get Broadcast

Tool to retrieve details of a specific broadcast by ID.

Get Broadcast Clicks

Tool to retrieve link click data for a specific broadcast by ID.

Get Broadcast Stats

Tool to retrieve statistics for a specific broadcast by ID.

Get Creator Profile

Tool to retrieve the creator profile information for the account.

Get Email Stats

Tool to retrieve email statistics for the account.

Get Growth Stats

Tool to retrieve growth statistics for the account over a date range.

Get Subscriber

Tool to retrieve a specific subscriber by their ID.

Get Subscriber Stats

Tool to retrieve email stats for a specific subscriber.

List Broadcasts

Tool to retrieve a paginated list of all broadcasts.

List Custom Fields

Tool to retrieve a paginated list of custom fields.

List Email Templates

Retrieve a paginated list of all email templates in the Kit account.

List Forms

Lists all forms in your Kit account with optional filtering and cursor-based pagination.

List Segments

Tool to retrieve a paginated list of segments.

List Sequences

Tool to retrieve a paginated list of all sequences.

List Subscribers

Tool to retrieve a list of subscribers.

List Subscribers For Form

Retrieves subscribers for a specific form by ID with optional filtering and cursor-based pagination.

List Tags

Retrieve a paginated list of all tags in the Kit account.

List Tag Subscribers

Tool to retrieve subscribers for a specific tag.

List Webhooks

Retrieve a paginated list of all webhooks configured in the Kit account.

Remove Tag From Subscriber

Tool to remove a tag from a subscriber using their subscriber ID.

Tag Subscriber

Tool to associate a subscriber with a specific tag by ID.

Tag Subscriber by Email

Assigns a tag to an existing subscriber using their email address.

Untag Subscriber by Email

Tool to remove a tag from a subscriber using their email address.

Update Account Colors

Tool to update the list of colors for the account.

Update Custom Field

Tool to update a custom field's label.

Update Subscriber

Tool to update an existing subscriber's information.

Update Tag

Tool to update a tag's name by ID.

FRAMEWORKS

How to build Kit MCP Agent with another framework

Claude Code logo

Claude Code

Use Kit MCP with Claude Code

OpenAI Agents SDK logo

OpenAI Agents SDK

Use Kit MCP with OpenAI Agents SDK

Claude Agent SDK logo

Claude Agent SDK

Use Kit MCP with Claude Agent SDK

Codex logo

Codex

Use Kit MCP with Codex

OpenClaw logo

OpenClaw

Use Kit MCP with OpenClaw

Hermes logo

Hermes

Use Kit MCP with Hermes

Atomic Agent logo

Atomic Agent

Use Kit MCP with Atomic Agent

Google ADK logo

Google ADK

Use Kit MCP with Google ADK

LangChain logo

LangChain

Use Kit MCP with LangChain

Vercel AI SDK logo

Vercel AI SDK

Use Kit MCP with Vercel AI SDK

Mastra AI logo

Mastra AI

Use Kit MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use Kit MCP with LlamaIndex

CrewAI logo

CrewAI

Use Kit MCP with CrewAI

Pydantic AI logo

Pydantic AI

Use Kit MCP with Pydantic AI

AutoGen logo

AutoGen

Use Kit MCP with AutoGen

FAQ

Frequently asked questions

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

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

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