nutmeg

A Claude Code plugin that makes Claude an expert at football data analytics.

Who it's for: Anyone who works with football data — analysts, developers, journalists, researchers, hobbyists. If you've ever spent an hour figuring out which Opta qualifier is xG, or why your StatsBomb coordinates are upside down, or how to normalise a heatmap properly, this is for you.

What it does: Gives Claude deep, verified knowledge of football data providers, libraries, and conventions. Claude looks up the actual docs instead of guessing from training data, writes code adapted to your stack, and catches football-specific mistakes in your work.

Why not just ask Claude directly? Claude knows football data exists but its knowledge is frozen and often wrong on specifics — qualifier IDs, API endpoints, coordinate systems, method signatures. These change. nutmeg connects Claude to a live, searchable index of real provider documentation so it gets the details right.

Capabilities

nutmeg gives Claude deep knowledge of football data so it can help you:

• Acquire data from Opta, StatsBomb, Wyscout, SportMonks, FBref, Understat, and more
• Wrangle event streams, transform coordinates, join datasets, handle large files
• Route entity-resolution work to the right public surface: provider facts in football-docs, public ID lookup in Reep Register, reusable matching code in reep-scripts
• Compute derived metrics like xG, PPDA, passing networks, expected threat
• Store data in the right format and publish results via Streamlit, Observable, or static sites
• Analyse matches, players, and teams with statistical rigour
• Learn football analytics concepts, from xG basics to academic research

It adapts to your experience level, preferred programming language, and available data sources.

Install

Full install (Claude Code plugin)

Includes skills, agents, and the football docs MCP server.

# From Claude Code — add the marketplace first (one-time), then install
/plugin marketplace add withqwerty/plugins
/plugin install nutmeg@withqwerty

Skills only (any AI coding agent)

Works with Claude Code, Cursor, Codex, Windsurf, and 40+ other agents via the Agent Skills standard.

npx skills add withqwerty/nutmeg

This installs the 10 skills but not the agents or MCP docs server. For the full experience (searchable provider docs, pipeline builder agent, data reviewer agent), use the plugin install above.

Setup

Run /nutmeg and describe what you want to do. On first run, it creates your profile (experience, tools, data access) so all skills adapt accordingly.

Skills

Most users only need two commands — /nutmeg routes everything else automatically.

Entry points

Skill	What it does
/nutmeg	Start here. Describe what you want — it handles setup, routing, and dispatch
/nutmeg-learn	Concepts, resources, provider docs, learning paths

Sub-skills (auto-dispatched or direct)

These are invoked automatically by /nutmeg based on what you're doing. Power users can call them directly.

Skill	What it does
/nutmeg-acquire	Fetch, scrape, or download data + manage API keys
/nutmeg-wrangle	Transform, filter, reshape data
/nutmeg-compute	Calculate derived metrics (xG, PPDA, passing networks)
/nutmeg-analyse	Explore and interpret football data
/nutmeg-brainstorm	Research-backed visualisation ideation and chart design
/nutmeg-store	Choose storage format and publishing method
/nutmeg-review	Review data code and charts for correctness and conventions
/nutmeg-heal	Fix broken scrapers, submit upstream issues

Football Docs MCP Server

nutmeg includes a searchable index of football data provider documentation. Think Context7 for football data. Provider-specific facts, including identity surfaces and ID-scheme quirks, should come from this index rather than from Nutmeg's own prompts.

The server is published as the football-docs npm package and starts automatically when nutmeg is loaded (via npx -y football-docs). No local build step is required.

Adding provider docs

Provider docs and the search index live in the football-docs repository. Drop markdown files in docs/{provider}/ there and run pnpm ingest to rebuild data/docs.db:

docs/providers/
  opta/
    event-types.md
    qualifiers.md
    coordinate-system.md
    api-access.md
  statsbomb/
    event-types.md
    data-model.md
    ...

Providers covered

Provider	Event data	Stats	xG	Tracking	Free?
StatsBomb	Yes	Yes	Yes	No	Open data (select comps)
Opta/Perform	Yes	Yes	Yes (xGOT too)	Yes	No (unofficial feed exists)
Wyscout	Yes	Yes	No	No	No
SportMonks	Partial	Yes	No	No	Free tier
FBref	No	Yes	Yes (via StatsBomb)	No	Yes (scraping)
Understat	No	Partial	Yes	No	Yes (scraping)
ClubElo	No	No	No	No	Yes (API)

License

MIT