Mailchimp MCP Server

by cyanheadsio.github.cyanheads/mailchimp-mcp-serverv0.3.11

Mailchimp via MCP: draft, test, and send campaigns; manage audiences and subscribers; pull reports.

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Active14d ago

Install Mailchimp MCP server

claude mcp add mailchimp-cyanheads -e MAILCHIMP_API_KEY='<mailchimp-api-key>' -- npx -y @cyanheads/mailchimp-mcp-server run start:stdio

{
  "mcpServers": {
    "mailchimp-cyanheads": {
      "command": "npx",
      "args": [
        "-y",
        "@cyanheads/mailchimp-mcp-server",
        "run",
        "start:stdio"
      ],
      "env": {
        "MAILCHIMP_API_KEY": "<mailchimp-api-key>"
      }
    }
  }
}

Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (project).

{
  "mcpServers": {
    "mailchimp-cyanheads": {
      "command": "npx",
      "args": [
        "-y",
        "@cyanheads/mailchimp-mcp-server",
        "run",
        "start:stdio"
      ],
      "env": {
        "MAILCHIMP_API_KEY": "<mailchimp-api-key>"
      }
    }
  }
}

Settings → Developer → Edit Config (claude_desktop_config.json), then restart.

{
  "servers": {
    "mailchimp-cyanheads": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@cyanheads/mailchimp-mcp-server",
        "run",
        "start:stdio"
      ],
      "env": {
        "MAILCHIMP_API_KEY": "<mailchimp-api-key>"
      }
    }
  }
}

Add to .vscode/mcp.json in your workspace.

{
  "mcpServers": {
    "mailchimp-cyanheads": {
      "command": "npx",
      "args": [
        "-y",
        "@cyanheads/mailchimp-mcp-server",
        "run",
        "start:stdio"
      ],
      "env": {
        "MAILCHIMP_API_KEY": "<mailchimp-api-key>"
      }
    }
  }
}

Add to ~/.codeium/windsurf/mcp_config.json.

Configuration

Variable	Required	Secret	Description
MAILCHIMP_API_KEY	yes	—	Mailchimp Marketing API key, including the '-dc' data-center suffix (e.g. 'abc...-us22'). Generate at Mailchimp → Account → Extras → API keys.
MAILCHIMP_BASE_URL	—	—	Override the API base URL (for mock servers or testing). Defaults to 'https://{dc}.api.mailchimp.com/3.0' derived from the API key suffix.
MAILCHIMP_TIMEOUT_MS	—	—	Per-request timeout in milliseconds.
MAILCHIMP_MAX_RETRIES	—	—	Max retry attempts for transient upstream failures (0-10).
MAILCHIMP_CONCURRENCY_LIMIT	—	—	Max in-flight upstream requests across this process (1-10).
MAILCHIMP_ASSETS_DIR	—	—	Absolute path to a local assets directory. When set (Node-only — Workers ignored), enables the `mailchimp_assets` tool and auto-uploads `@assets/<path>` references in campaign HTML to Mailchimp File Manager at send time. Cache at <dir>/.mailchimp-cache.json.
MAILCHIMP_TEMPLATES_DIR	—	—	Absolute path to a local templates directory. When set (Node-only), enables the `mailchimp_local_templates` tool and support for `content.localTemplate` on campaign tools. Templates are `.eta` files with optional YAML frontmatter; legacy `<name>.meta.yaml` sidecars are read when frontmatter is absent. Canonical write path on free-tier Mailchimp.
MCP_LOG_LEVEL	—	—	Minimum log level for output: debug, info, notice, warning, or error.
MCP_HTTP_HOST	—	—	The hostname for the HTTP server.
MCP_HTTP_PORT	—	—	The port to run the HTTP server on.
MCP_HTTP_ENDPOINT_PATH	—	—	The endpoint path for the MCP server.
MCP_AUTH_MODE	—	—	Authentication mode to use: 'none', 'jwt', or 'oauth'.

Freshness

Active — last maintenance signal 14d ago. The newest of the signals below sets the band.

Last commit (default branch)
2026-09-26 · 14d ago · GitHub
Latest release
2026-09-26 · 14d ago · GitHub · v0.3.11
Package published
no data · npm/PyPI
Registry entry updated
2026-09-26 · 14d ago · official registry · v0.3.11

FAQ

›How do I install the Mailchimp MCP server in Claude Code?

Run: claude mcp add mailchimp-cyanheads -e MAILCHIMP_API_KEY='<mailchimp-api-key>' -- npx -y @cyanheads/mailchimp-mcp-server run start:stdio. For Cursor, VS Code, Claude Desktop and Windsurf, use the install tabs above.

›Does Mailchimp require an API key?

Yes. It expects MAILCHIMP_API_KEY.

›Can I use Mailchimp as a remote (hosted) MCP server?

Yes — it offers both a hosted endpoint and a local stdio package.

›Is Mailchimp in the official MCP registry?

Yes, as io.github.cyanheads/mailchimp-mcp-server.