Marrow

Overview

Marrow is an MCP server that provides runtime governance, proof, outcome closure, and fleet intelligence for MCP-compatible AI agents. By speaking the Model Context Protocol, it lets AI assistants call Marrow as a set of tools directly, without manual context switching.

Marrow runs locally via the npm package @getmarrow/mcp, which communicates over stdio. Installation is straightforward with npx -y @getmarrow/mcp. You'll need to provide MARROW_API_KEY as an environment variable to authenticate. The latest release is v3.9.79, published under the MIT license with source code available at getmarrow/marrow-mcp on GitHub.

Marrow is listed in the AI & Agents category on mcp.site and works with any MCP-compatible client including Claude Desktop, Claude Code, Cursor, VS Code, Windsurf, and Zed. If you maintain Marrow, claim this listing to verify ownership and keep information up to date.

Installation

// claude_desktop_config.json
{
  "mcpServers": {
    "marrow": {
      "command": "npx",
      "args": [
        "-y",
        "@getmarrow/mcp"
      ],
      "env": {
        "MARROW_API_KEY": "<marrow-api-key>"
      }
    }
  }
}

Requires MARROW_API_KEY