marginal MCP Server: Install & Setup

Install marginal in Claude Code

Claude Code

claude mcp add --transport http marginal https://marginal.sh/mcp

mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)

{
  "mcpServers": {
    "marginal": {
      "url": "https://marginal.sh/mcp"
    }
  }
}

Frequently asked questions

What does the marginal MCP server do?

Email A/B tests for AI agents: subject lines, managed sends, open/click tracking, and results.

Is the marginal MCP server free?

The server is free, but you will likely need an account. The server itself is free, but it connects to a service that needs an account or API key, which may have paid tiers. Check the provider for current pricing.

Does marginal run locally or remotely?

Remote. Hosted by the provider. You connect with a URL, nothing to install.

How do I add marginal to Claude Code?

Run: claude mcp add --transport http marginal https://marginal.sh/mcp

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