Official MCP RegistryHosted servermarginal.sh

Marginal

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

Connect to Claude Code

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

Vendor-hosted remote server: nothing to install locally. If it uses OAuth, Claude opens the vendor login on first use.

Endpoints

Published in the official MCP registry as “Marginal”. Verified through the vendor namespace.