Marrow (skeletonarmytech) MCP Server

Give your AI agents read-only access to your own Apple Health data. Marrow is a free iOS app that tracks 178 health data series - 172 Apple Health types plus its own meal diary and set-by-set weightlifting log. This repo is its self-hosted companion server: one Python file, standard library only, that keeps a SQLite mirror of your data on hardware you own and serves it over the Model Context Protocol so agents can…. Its 7 documented tools cover metric, log.

People who work with metric and log and want it reachable from Claude, Cursor, VS Code, or another MCP client. The project is written in Python.

VERIFIED ACTIVE

LAST COMMIT 2026-09-12 · ★ 2 · #41 OF 71 MAINTAINED SCIENCE & HEALTH · VERIFIED 2026-09-18

MIT · Python servers · how we verify → /methodology

01 · Install Marrow (skeletonarmytech)

Claude Code

claude mcp add skeletonarmytech-marrow-mcp -- uvx marrow-mcp

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "skeletonarmytech-marrow-mcp": {
      "command": "uvx",
      "args": [
        "marrow-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

repo age created 2026-08-16 - young repo, little track record yet

license MIT - declared in the repository

pypi package marrow-mcp - check the name against the project README before installing (PyPI has no namespace ownership)

registry vendor namespace tech.skeletonarmy - domain-verified with the official MCP registry

03 · What Marrow (skeletonarmytech) can do

Prose above is summarized from the project's README and registry record - no invented capabilities.

What you can build

An agent gets 7 documented tools spanning metric, log, including health_summary, list_metrics, metric_daily, metric_samples.

Capability map

Tools grouped from the project's README - what Marrow (skeletonarmytech) lets an agent do.

Metric

2 tools - e.g. Daily values for any metric, up to 400 days; Raw records with timestamps and source devices

metric_daily · metric_samples

Health

1 tool - e.g. Recent days across activity, heart, sleep and nutrition

health_summary

read & search

1 tool - e.g. Every metric in the mirror, with units and coverage

list_metrics

Workouts

1 tool - e.g. Workouts, including set-by-set strength detail

workouts

Nutrition

1 tool - e.g. The meal diary: every logged food with full nutrient detail, by day

nutrition_log

Strength

1 tool - e.g. Every lifting set with estimated 1RM, per-exercise progression, and volume per muscle group

strength_log

Latest releases

v0.2.4 · 2026-08-18

Adds the two tools that shipped in the app but were missing from the published package: strength_log (every set, 1RM per exercise, volume per muscle group) and nutrition_log (the meal diary, whole-day replace on…

v0.2.2 · 2026-08-16

Repo moved to the skeletonarmytech organization. Functionally identical to 0.2.1; all links updated. · Generated with Claude Code

v0.2.1 · 2026-08-16

First packaged release. · pip install marrow-mcp (PyPI) · marrow.mcpb: one-click Claude Desktop extension. Install, then enter the URL and token shown by the Marrow app or your mirror. · Listed in the official MCP…

04 · Who maintains Marrow (skeletonarmytech)

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

05 · Facts

repository: github.com/skeletonarmytech/marrow-mcp
website: https://skeletonarmy.tech/mcp
category: science & health - ranked #41 of 71 actively-maintained science & health servers as of 2026-09-18.
release cadence: 3 releases in the last 90 days (latest 2026-08-18)
registry: tech.skeletonarmy/marrow (active, first published 2026-08-16 · 4 versions)
packages: pypi:marrow-mcp

06 · Marrow (skeletonarmytech) FAQ

Is Marrow (skeletonarmytech) still maintained?

Yes - as of 2026-09-18, its last commit was 2026-09-12 and it shipped 3 releases in the last 90 days. We re-verify nightly.

What can Marrow (skeletonarmytech) do?

An agent gets 7 documented tools spanning metric, log, including health_summary, list_metrics, metric_daily, metric_samples.

How do I install Marrow (skeletonarmytech)?

Run `uvx marrow-mcp`. You can also paste the ready-made client config above.

Does Marrow (skeletonarmytech) run locally?

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

07 · Alternatives to Marrow (skeletonarmytech)

Alternatives to Marrow (skeletonarmytech)

Maintained science & health servers if Marrow (skeletonarmytech) isn't the fit.

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