marginal for Claude Code

sh.marginal/mcp

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

client:Claude Code transport:streamable-http

Install marginal in Claude Code

run in your project directory

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

Adds it for this project only. Append --scope user to make it available everywhere. Claude Code docs