Marrow MCP Server

Marrow is the runtime control and proof layer for teams running AI agents. It applies policy and prior lessons before consequential actions, then records the evidence and outcome afterward. It runs locally over stdio via the published package.

People connecting this server to Claude, Cursor, VS Code, or another MCP client. The project is written in JavaScript.

VERIFIED ACTIVE

LAST COMMIT 2026-08-23 · ★ 5 · #62 OF 848 MAINTAINED OTHER · VERIFIED 2026-08-25

MIT · JavaScript servers · how we verify → /methodology

01 · Install Marrow

before you install - you'll need

MARROW_API_KEY

Environment variables documented in the project's README - it lists which are required and which have defaults.

Claude Code

claude mcp add getmarrow-marrow-mcp -- npx -y @getmarrow/mcp

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "getmarrow-marrow-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@getmarrow/mcp"
      ]
    }
  }
}

Same JSON for Cursor. For VS Code, rename the top-level key from `mcpServers` to `servers`.

Using another client? Same JSON, different key

Claude Desktop · mcpServers

Cursor · mcpServers

VS Code · servers

Windsurf · mcpServers

Zed · context_servers

Cline · mcpServers

Roo Code · mcpServers

Continue · mcpServers

LibreChat · mcpServers

Gemini CLI · mcpServers

Codex CLI · mcp_servers

Full setup guides: every client.

02 · Evidence

Security posture

What to check before giving this server access to your agent - from the registry, GitHub, and our own probes. We don't score safety; we show what's verifiable.

runs as local process (stdio) - runs on your machine with your user's permissions

license MIT - declared in the repository

npm package @getmarrow/mcp - published under the repo owner's npm scope (@getmarrow)

registry namespace io.github.getmarrow is GitHub-verified and matches the repo owner

03 · Who maintains Marrow

marrow is maintained by getmarrow. It's the only MCP server we track from this author; the repo dates to Apr 2026.

04 · Facts

repository: github.com/getmarrow/marrow-mcp
category: other - ranked #62 of 848 actively-maintained other servers as of 2026-08-25.
registry: io.github.getmarrow/marrow (active, first published 2026-07-28 · 27 versions)
packages: npm:@getmarrow/mcp

05 · Marrow FAQ

What is Marrow?

Is Marrow still maintained?

Yes - as of 2026-08-25, its last commit was 2026-08-23. We re-verify nightly.

How do I install Marrow?

Run `npx -y @getmarrow/mcp`. The README documents one environment variable (MARROW_API_KEY) to set first. You can also paste the ready-made client config above.

Does Marrow run locally?

Yes - it's a stdio server: it runs on your machine (via npx) with your user's permissions. Your data stays local unless the server itself calls external APIs.

06 · Alternatives to Marrow

Alternatives to Marrow

Maintained other servers if Marrow isn't the fit.

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