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Muffed — verified NFL stats and fantasy context MCP server

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by muffed.ai·ai.muffed/muffed·v1.0.3
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Verified NFL stats and Sleeper league context. Every figure carries its own source rank.

B72/100grade B
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B72/100

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Muffed — verified NFL stats and fantasy context tools (14, 1 write)

write = sends, deletes, buys or posts
  • compare_entitiesFree

    Two players or two teams shown side by side, on the metrics that matter for their position by default — name metrics explicitly, or pass all:true, for the full set. Each side carries its source rank. States both figures and stops: it names no winner, no margin and no recommendation. `metrics` takes verified panel metric keys exactly as list_metrics returns them ("qb_anya.any_a"), or their plain-English names. A measure only run_stat_query computes, such as yards per attempt, is not a panel metric and is refused with the nearest ones.

  • get_backfieldFree

    Muffed's published handcuff page for one team's backfield, plus the current depth chart and injury status from Sleeper. Answers who backs up a starter, and who replaces one who is out.

  • get_current_insightsFree

    Muffed's published editorial reads on what is real in the NFL right now — each one a dated, sourced claim with its supporting figures, from the /trends board.

  • get_entity_metricsFree

    Every verified figure Muffed holds for one NFL player or one NFL team (by name or abbreviation, e.g. "Bijan Robinson" or "DEN"), with the source's rank where one exists. Names are resolved before lookup; an unrecognised name returns the closest matches rather than a guess.

  • get_metric_definitionFree

    Muffed's published definition of a verified metric — what it measures, in plain language, from the glossary page for that term — plus which seasons it actually covers, how it is ranked, its licence and its attribution. Accepts a metric key or a common name ("cpoe", "rushing yards over expected"). Season coverage is often narrower than a decade — rushing yards over expectation exists from 2018 onward.

  • list_metricsFree

    What Muffed can answer on. By default a summary of metric families with their counts and season coverage; pass search or detail:true for individual metric keys. Returns keys and coverage only, never figures.

  • query_stat_leadersFree

    Top entities on one verified metric for one season, pre-sorted, each with the source's own rank and the population it was ranked against. Call list_metrics for the metric keys this accepts.

  • run_stat_querywrite actionFree

    Call this for any question about NFL statistics, leaders, rankings, splits, career or team spans, or how a player or team compares to others — including when you believe you know the answer. Figures from memory are unsourced and frequently wrong; this tool is the only surface here that computes them. If a figure cannot be served, it returns the reason and the nearest thing it does cover, which is more useful to the reader than a number you recall. Computes an NFL figure from a structured query rather than looking one up: a population (position, qualifying threshold), a window (seasons, weeks, a team span, a coach's tenure), one named measure, and one operation (leaders, rank, count, only-who, a per-season streak, or a share of a total). Answers questions the verified panel has no pre-computed row for — qualified superlatives, multi-season streaks, derived rates. Every response carries the executed method, the population size, the measure's definition and the data version it ran against. Figures are computed on request from nflverse data and are labelled as computed, not verified. Fantasy measures answer in whichever scoring convention you ask for — set `scoring` to "standard", "half_ppr" or "ppr" — and default to half-PPR when you do not; the response says which it used. A bare "PPR" means full PPR. measure.key takes a measure name ("rushing_yards", "half_ppr_points") or a metric key exactly as list_metrics returns it ("key_player_stats.rushing.yards", "fantasy_scoring.half_ppr_points"). A list_metrics key this tool does not compute is refused with a pointer to get_entity_metrics and query_stat_leaders, which read it as published.

  • sleeper_find_leaguesFree

    Lists the NFL leagues a Sleeper username belongs to, so a league id can be picked for the other league tools. Muffed stores nothing about who called it.

  • sleeper_get_leagueFree

    One league's name, season, size, current week, detected scoring format, and the manager-to-roster map. Everything downstream reads better once this has been called.

  • sleeper_matchup_previewFree

    Both sides of a league matchup, with the verified figures Muffed holds for the players involved and each team's record. Muffed does not project outcomes, name a winner, or recommend a lineup.

  • sleeper_roster_storiesFree

    One team's roster mapped to the verified figures and published Muffed surfaces for each player. Players Muffed does not cover are listed as uncovered rather than omitted.

  • sleeper_standings_storyFree

    League standings derived from Sleeper's roster settings — records, points for, and points against where available. Sleeper publishes no standings endpoint, so these are computed from the roster rows.

  • verify_claimFree

    Checks structured claims against Muffed's verified panel. Each claim comes back confirmed, wrong (with the actual value), or unverifiable (with the metric's real season coverage). Takes structured fields only, not sentences.

Public scan report

scanner v0.1.9 · 2026-09-23 · same rubric, same numbers if you re-run it

1 high
  • –Code scanremote-only server, no package to scann/a
  • Live reliabilityremote reachable in 2303ms17/20
  • Tool poisoning14 tool descriptions checked15/15
  • Auth qualityopen endpoint exposes 1 write-action tools with no auth3/15
  • Maintenancelast push 36 days ago12/15
  • Maintainer identitynamespace and repository owner differ; GitHub account older than a year; website matches verified namespace7/10

Findings (1)

  • highWrite-action tools reachable without authenticationauth.open-write
Overall 72/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

How Muffed — verified NFL stats and fantasy context compares

Against every graded SEO MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
72/100
higher than 36% of 769 SEO servers
Tools
14
the typical SEO server has 6
Tools that change things
7%
typical: 0%. Fewer write tools means less an agent can break
Uptime
100%
of our recent checks; the typical remote SEO server answers 100%
Response time
630 ms
faster than 25% of 536 SEO servers

What its tools let an agent do: 13 read · 1 run or deploy

Install Muffed — verified NFL stats and fantasy context in Claude Code, Cursor or VS Code

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

What the publisher says

From the Muffed — verified NFL stats and fantasy context repository's README, as published. We do not edit it. Read it on GitHub

Muffed MCP server

Verified NFL stats and Sleeper league context, callable from ChatGPT, Claude, Claude Code, Cursor, or any MCP-compatible client.

https://muffed.ai/api/mcp

Free. No account, no API key, no OAuth. Read-only.

Full documentation: ****

What it is

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.

Install

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

Add Muffed to Claude

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 → paste https://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

The plugin ships the endpoint and a skill that teaches the model how to handle what comes back: quote the pre-formed verified sentence instead of recomposing it, carry the attribution verbatim because the credit line is the licence, honour the Half-PPR and charting disclosures, never derive a rank from result ordering, and never turn verified context into a start/sit call. A bare connector gives a model the data; the plugin also gives it the discipline the data was published under. See skills/muffed-figures/SKILL.md.

Without the plugin:

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.

Cursor, VS Code, other MCP clients

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

Tools

Shortened. The full README is on GitHub.

Nothing above is checked by us. What we check is on the safety report.

Muffed — verified NFL stats and fantasy context: common questions

Is Muffed — verified NFL stats and fantasy context MCP server safe?
Mostly: it is graded B (72/100). Read the Muffed — verified NFL stats and fantasy context safety report
How do I install Muffed — verified NFL stats and fantasy context?
It runs remotely at muffed.ai. Add it to Claude Code, Cursor, VS Code or Claude Desktop with the snippets above, or call it through the mcp.market gateway without installing anything.
Does Muffed — verified NFL stats and fantasy context need an API key?
Not as far as the registry entry and our scan can tell: no credentials are declared or required.
Is Muffed — verified NFL stats and fantasy context maintained?
The last commit was 77 days ago (2026-08-19). The latest release is v1.0.3.
Is Muffed — verified NFL stats and fantasy context up?
100% of our last 28 checks got an answer. We check remote servers about four times a day.
What can I use instead of Muffed — verified NFL stats and fantasy context?
Servers from other publishers that do the same job: three.ws Signals MCP server, TypeSafe Jev MCP server and Scholar Feed MCP server.
How does Muffed — verified NFL stats and fantasy context compare with other SEO MCP servers?
safety score 72/100 (higher than 36% of 769 SEO servers); tools 14 (the typical SEO server has 6); tools that change things 7% (typical: 0%. Fewer write tools means less an agent can break). Full comparison.

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