Open Source MCP Server Connects Claude to Mailchimp API

A developer has created an open-source MCP (Model Context Protocol) server that enables Claude to interact directly with Mailchimp accounts. The server was built entirely using Claude Code, which handled project scaffolding, API integration with Mailchimp's Marketing API v3, and packaging including pyproject.toml and entry points.

Key Features and Tools

The server provides 53 tools covering these Mailchimp areas:

• Campaigns
• Audiences
• Members
• Reports
• Automations
• Templates
• Landing pages
• E-commerce
• Batch operations

Reporting capabilities include per-link click analytics, domain performance breakdowns, member-level activity tracking, and e-commerce revenue attribution.

Example Use Cases

Users can perform queries like:

• "Show me all campaigns sent this month with their open rates"
• "Which links got the most clicks in my last newsletter?"
• "Tag all subscribers from segment X with 'VIP'"
• "Create a draft campaign for my main audience with subject 'March Update'"
• "What does my audience growth look like over the past 6 months?"
• "Pause my welcome automation"

Safety Features

Since the server includes write actions (adding contacts, managing tags, scheduling sends), it includes built-in safety modes:

• MAILCHIMP_READ_ONLY=true — blocks all write operations, recommended for exploration and shared setups
• MAILCHIMP_DRY_RUN=true — previews what a write action would do without calling the API, useful for testing prompts

The API key is stored in an environment variable and never persisted.

Setup Requirements

The server is free to use and open source. Users need:

• A Mailchimp API key (free to generate)
• Compatibility with both Claude Desktop and Claude Code

The GitHub repository includes setup instructions for both clients with a recommended read-only configuration.