Muffed

An AI asked a football question today either answers from whenever its training stopped, or finds a blog post. It cannot realistically download ten seasons of play-by-play and run a rushing-yards-over-expected model.

Muffed already did that. This server makes the result callable.

Every figure comes back with the rank its source gave it and the population it was ranked against, so a claim arrives as"358.16 rushing yards over expectation, 1st of 49"rather than as a number with nothing behind it. Each response also carries a complete, quotable sentence, its own attribution, and an as-of date.

Coverage:520 verified metrics, 2016–2025 — EPA splits, CPOE, rushing yards over expectation, pressure and blitz rates, coverage splits, snap and target share, red zone and down-conversion rates, and more. Each metric reports the seasons it actually has.

Claude(web, desktop, mobile) — one click:

That opens the Add-custom-connector dialog with the name and URL already filled; you still review and confirm. By hand: Settings → Connectors → Add custom connector → pastehttps://muffed.ai/api/mcp. There is no sign-in step, because there is nothing to authorize.

Claude Code— install the plugin rather than the bare connector:

/plugin marketplace add cfagan17/muffed-mcp /plugin install muffed@muffed

claude mcp add --transport http muffed https://muffed.ai/api/mcp

ChatGPT— Settings → Connectors (or Developer mode) → add an MCP server → paste the same URL, no authentication.

{ "mcpServers": { "muffed": { "type": "http", "url": "https://muffed.ai/api/mcp" } } }

Every tool is read-only. Nothing writes, and no tool returns anything about a Muffed user.

1 · The panel is a reshaping, never a computation.Figures are normalized from a gated verified layer. A build gate re-derives every row back to its source coordinate and fails the build on any drift, so a source refresh that moves a number breaks CI rather than a published sentence.

2 · Verify the query template, not the sentence.A handful of parameterized queries are the templates; every instantiation inherits the gate the sources already passed. There is no arbitrary-compute endpoint and there never will be — a tool that computes a novel number on request returns a figure no gate has seen, to a model that will round it, recombine it, and attribute the result.

3 · The server ranks, filters and rounds. The model never computes.Few rows, pre-sorted, rank and population already attached. Most "the AI got the stat wrong" failures are a model doing arithmetic on returned data.

Where the source had no unambiguous rank,no rank is returned at allrather than one derived from the result set's ordering.

Rushing yards over expectation exists from2018, not 2016 — it is tracking-dependent and there is no pre-NGS version. Ask for a decade and the server returns the metric's real coverage instead of eight rows labelled as ten.

Every metric's registry entry carries the seasons it actually has, andget_metric_definitionis how a model finds that out before making a claim.

Hand it a figure your AI has already stated:

Individuals, use it freely. If you are calling it at volume or building it into a product, get in touch first so it stays up for everyone. The underlying nflverse data is CC-BY and free — what Muffed adds is verification, structure, freshness, and the story layer.

This repo holds the server's public manifests, the Claude Code plugin, and the documentation. The server itself runs as part of muffed.ai, which is closed-source — the plugin is a pointer to the hosted endpoint plus the skill, not a copy of the server.

.claude-plugin/marketplace.json the marketplace /plugin marketplace add reads .claude-plugin/plugin.json the plugin manifest .mcp.json the endpoint the plugin installs skills/muffed-figures/SKILL.md how to quote the figures correctly server.json MCP Registry manifest (ai.muffed/muffed) glama.json maintainer declaration for the Glama listing

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