MCP Kit Server

Architecture

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An MCP (Model Context Protocol) server that connects AI assistants like Claude to the Kit.com (formerly ConvertKit) email marketing platform. Manage your email lists, subscribers, broadcasts, sequences, and more through natural language.

[!WARNING] This project is deprecated and no longer maintained. Kit now ships official, first-party MCP servers that supersede it with broader API coverage and managed authentication. Please migrate — see below.

⚠️ Deprecated — use Kit's official MCP servers

This community server was built before Kit offered its own MCP. Kit now maintains official servers that cover far more of the Kit API v4 surface (including analytics, commerce, segments, and bulk operations), handle auth for you, and stay current with API changes. New and existing users should migrate.

Migrate in Claude Code

# Remove this deprecated server (if you added it as "kit")
claude mcp remove kit

# Add the official operational Kit MCP
claude mcp add --transport http kit https://app.kit.com/mcp

# Optional: add Kit's developer-docs MCP for building integrations
claude mcp add --transport http kit-docs https://developers.kit.com/mcp

Official setup guides (Claude Desktop, Cursor, Windsurf, Cline, and more): <https://developers.kit.com/mcp/kit-developer-docs-mcp/mcp/overview>

<details> <summary>📦 Legacy documentation (for historical reference)</summary>

Why Use This?

If you run a newsletter or email marketing on Kit.com, this MCP server lets you:

• Manage subscribers - List, create, update, and organize your email subscribers
• Handle tags efficiently - Create tags, add/remove tags from subscribers, list subscribers by tag
• Work with sequences - View email sequences and add subscribers to automated sequences
• Create broadcasts - Draft and manage email campaigns
• Analyze your list - Query subscriber data with filters (status, date ranges, custom fields)
• Automate workflows - Let Claude handle repetitive email marketing tasks

Features

Complete Tool Reference

Account

• kit_get_account - Get Kit.com account information

Subscribers (7 tools)

• kit_list_subscribers - List subscribers with filters (status, date ranges, pagination)
• kit_get_subscriber - Get a specific subscriber by ID
• kit_create_subscriber - Create a new subscriber
• kit_update_subscriber - Update subscriber details
• kit_get_subscriber_tags - Get all tags for a subscriber
• kit_add_tag_to_subscriber - Add a tag to a subscriber
• kit_remove_tag_from_subscriber - Remove a tag from a subscriber

Tags (6 tools)

• kit_list_tags - List all tags
• kit_get_tag - Get a specific tag
• kit_create_tag - Create a new tag
• kit_update_tag - Rename a tag
• kit_delete_tag - Delete a tag
• kit_list_tag_subscribers - List all subscribers with a specific tag

Sequences (3 tools)

• kit_list_sequences - List all email sequences
• kit_get_sequence - Get sequence details
• kit_add_subscriber_to_sequence - Add subscriber to a sequence

Broadcasts (5 tools)

• kit_list_broadcasts - List all broadcasts
• kit_get_broadcast - Get broadcast details
• kit_create_broadcast - Create a new broadcast
• kit_update_broadcast - Update a broadcast
• kit_delete_broadcast - Delete a broadcast

Forms (3 tools)

• kit_list_forms - List all forms
• kit_get_form - Get form details
• kit_add_subscriber_to_form - Add subscriber via form

Custom Fields (1 tool)

• kit_list_custom_fields - List all custom fields

Webhooks (3 tools)

• kit_list_webhooks - List configured webhooks
• kit_create_webhook - Create a new webhook
• kit_delete_webhook - Delete a webhook

Prerequisites

• Node.js 18+
• A Kit.com account
• Your Kit.com API key (v4 API)

Installation

Option 1: Install from npm (recommended)

npx kit-mcp-server

Or install globally:

npm install -g kit-mcp-server

Option 2: Clone and Build

git clone https://github.com/aplaceforallmystuff/mcp-kit.git
cd mcp-kit
npm install
npm run build

Configuration

1. Get Your Kit.com API Key

1. Log in to Kit.com
2. Navigate to Settings > Developer
3. Create a new API key or copy an existing v4 API key

2. Configure Your MCP Client

#### For Claude Desktop

Add to your Claude Desktop config file:

macOS: ~/Library/Application Support/Claude/claude_desktop_config.json

Windows: %APPDATA%\Claude\claude_desktop_config.json

{
  "mcpServers": {
    "kit": {
      "command": "node",
      "args": ["/path/to/mcp-kit/dist/index.js"],
      "env": {
        "KIT_API_KEY": "your-api-key-here"
      }
    }
  }
}

#### For Claude Code

claude mcp add kit -e KIT_API_KEY=your-api-key-here -- node /path/to/mcp-kit/dist/index.js

Or add to ~/.claude.json:

{
  "mcpServers": {
    "kit": {
      "command": "node",
      "args": ["/path/to/mcp-kit/dist/index.js"],
      "env": {
        "KIT_API_KEY": "your-api-key-here"
      }
    }
  }
}

Usage Examples

Once configured, you can interact with Kit.com through natural language:

Subscriber Management

"Show me all active subscribers from the last 30 days"

"Create a new subscriber with email [email protected] and tag them as 'newsletter'"

"What tags does [email protected] have?"

Tag Operations

"List all my tags and how many subscribers each has"

"Create a tag called 'VIP Customers'"

"Add the 'engaged' tag to all subscribers who signed up this month"

Email Sequences

"Show me all my email sequences"

"Add [email protected] to the welcome sequence"

Broadcasts

"Create a draft broadcast with subject 'Weekly Update' and preview text 'This week in AI...'"

"List all my recent broadcasts and their stats"

Forms

"Show me all active forms"

"Add a subscriber to my main signup form"

Development

# Run in development mode (watches for changes)
npm run dev

# Build for production
npm run build

# Run the built version
npm start

Troubleshooting

"KIT_API_KEY environment variable is required"

Ensure you have set the KIT_API_KEY environment variable in your MCP configuration.

"Kit API error (401)"

Your API key is invalid or expired. Generate a new one from Kit.com Settings > Developer.

"Kit API error (403)"

Your API key doesn't have permission for this operation. Check that you're using a v4 API key with appropriate scopes.

"Kit API error (404)"

The resource (subscriber, tag, broadcast, etc.) was not found. Verify the ID is correct.

"Kit API error (422)"

Invalid request data. Check that email addresses are valid and required fields are provided.

API Reference

This server uses the Kit.com API v4. All tools support pagination where applicable using per_page and after cursor parameters.

Contributing

This project is deprecated and not accepting contributions. Please use Kit's official MCP servers instead.

License

MIT License - see LICENSE for details.

Links

• Kit.com
• Kit.com API Documentation
• Model Context Protocol
• MCP Specification

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