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marginal

Official registry Productivity

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

Website

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http marginal 'https://marginal.sh/mcp' --header 'Authorization: <Bearer token with your marginal API key from https://marginal.sh/dashboard>'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "marginal": {
            "type": "http",
            "url": "https://marginal.sh/mcp",
            "headers": {
                "Authorization": "<Bearer token with your marginal API key from https://marginal.sh/dashboard>"
            }
        }
    }
}

Frequently asked questions

What is marginal?

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

How do I install marginal?

It runs as a remote server. In Claude Code: claude mcp add --transport http marginal 'https://marginal.sh/mcp' --header 'Authorization: <Bearer token with your marginal API key from https://marginal.sh/dashboard>'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does marginal need an API key?

Yes. It expects Authorization, which you set in its configuration.

Who maintains marginal?

It is published by sh.marginal. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.