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Muffed — verified NFL stats and fantasy context

REMOTE · MUFFED.AI · SCANNED SEP 22

Verified NFL stats and Sleeper league context. Every figure carries its own source rank.

Available components

0 this week 81 Trust /100
Trust breakdown (7 categories)

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. How we score → Why this is hard to score →

Endpoint Security80
Transport & Reachability100
Schema Quality & AI Usability56
  • AI-judged instruction clarity (good).Pass
  • Context-footprint check failed: tool/resource definitions use about 2660 tokens (~190/item across 14 items; 14 tools + 0 resources), over budget; trim descriptions and params. See how to fix → Fail
  • Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management100
  • No destabilizing schema changes in the last 30 days.Pass
Tool Coverage67
  • 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
  • 0% of tool parameters carry a description.Fail
Tool Safety100
  • No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
  • We read all 14 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
  • An AI judge read all 15 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
  • Implements a current MCP spec version (2026-07-28).Pass
Install

How do I install the Muffed — verified NFL stats and fantasy context MCP server?

Muffed — verified NFL stats and fantasy context is a hosted endpoint at https://muffed.ai/api/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

remote · muffed.ai

# add to Claude Code
claude mcp add --transport http ai-muffed-muffed 'https://muffed.ai/api/mcp'
// .cursor/mcp.json
{
  "mcpServers": {
    "ai-muffed-muffed": {
      "url": "https://muffed.ai/api/mcp"
    }
  }
}
// .vscode/mcp.json
{
  "servers": {
    "ai-muffed-muffed": {
      "type": "http",
      "url": "https://muffed.ai/api/mcp"
    }
  }
}
# ~/.codex/config.toml
[mcp_servers.ai-muffed-muffed]
url = "https://muffed.ai/api/mcp"
// opencode.json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "ai-muffed-muffed": {
      "type": "remote",
      "url": "https://muffed.ai/api/mcp",
      "enabled": true
    }
  }
}
# add to OpenClaw
openclaw mcp add ai-muffed-muffed --url 'https://muffed.ai/api/mcp' --transport streamable-http
# ~/.hermes/config.yaml
mcp_servers:
  ai-muffed-muffed:
    url: "https://muffed.ai/api/mcp"
// ~/.netclaw/config/netclaw.json
{
  "McpServers": {
    "ai-muffed-muffed": {
      "Transport": "http",
      "Url": "https://muffed.ai/api/mcp"
    }
  }
}
# add to Vellum
assistant mcp add ai-muffed-muffed -t streamable-http -u 'https://muffed.ai/api/mcp'
// mcp.json
{
  "mcpServers": {
    "ai-muffed-muffed": {
      "type": "http",
      "url": "https://muffed.ai/api/mcp"
    }
  }
}

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

Changelog

Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.

  • 18 Sept 26 0
    • Tool “compare_entities” rewrote its description, which is the text the model reads security
    • Tool “run_stat_query” rewrote its description, which is the text the model reads security
  • 6 Sept 26 +8
    • Judged manipulation: unverified → pass security
    • Schema quality: unverified → good functional
  • 5 Sept 26 −9
    • Judged manipulation: pass → unverified security
    • The server rewrote its instructions, which are the text every model session reads security
    • Schema quality: good → unverified functional
    • “get_entity_metrics” added an optional parameter “scope” cosmetic
  • 2 Sept 26 +1
    • Stability: fail → pass security
  • 30 Aug 26 +1
    • The server rewrote its instructions, which are the text every model session reads security
  • 28 Aug 26 +1

    No change was recorded against any check on this day. Stability & Change Management went from 81 to 85.

  • 26 Aug 26 +2
    • We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
  • 25 Aug 26 +1

    No change was recorded against any check on this day. Stability & Change Management went from 71 to 75.

Diagnostics

Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.

Captured 22 Sept 2026 · Probed https://muffed.ai/api/mcp

TLS valid

Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .

Subject Issuer Valid from Valid until Key Signature Serial
CN=muffed.ai CN=YR2,O=Let's Encrypt,C=US 19 Aug 2026 17 Nov 2026 RSA 2048 SHA256-RSA 6be69cac38e073d7a42236fbe60d1754a15
SANs: muffed.ai
CN=YR2,O=Let's Encrypt,C=US (CA) CN=Root YR,O=ISRG,C=US 3 Sept 2025 2 Sept 2028 RSA 2048 SHA256-RSA 4ebd24947e24d394802d84a52fd5b319
CN=Root YR,O=ISRG,C=US (CA) CN=ISRG Root X1,O=Internet Security Research Group,C=US 13 May 2026 2 Sept 2032 RSA 4096 SHA256-RSA f24b6d17f9d9ad7cb1c9fea78782699f

Background: What to check on a remote MCP endpoint →

DNSSEC insecure

Validation of muffed.ai. Not signed

Zone DS Keys Algorithms Outcome
. trust_anchor 20326, 38696 8, 8 Verified
ai. present 3799 8 Verified
muffed.ai. absent Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation
Authentication No authorisation required

The endpoint answered without asking for a token. Anyone who knows the URL can reach it.

Result No authorisation required
HTTP status 200
Header Value
strict-transport-security max-age=63072000

Background: How OAuth 2.1 works in the 2026 MCP spec →

Transports 2 probes
Transport URL Outcome Status Location
streamable-http https://muffed.ai/api/mcp Verified 200
http (plaintext) http://muffed.ai/api/mcp HTTPS enforced 308 https://muffed.ai/api/mcp
MCP tools · 14 exposed · ~1,421 tokens

The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →

Tool Tokens
compare_entities ~164

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.

NameTypeReqDescription
astringyes
allboolean
bstringyes
entity_kindstring
metricsarray
seasoninteger

No output schema declared.

No examples provided.

get_backfield ~57

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.

NameTypeReqDescription
teamstringyes

No output schema declared.

No examples provided.

get_current_insights ~59

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.

NameTypeReqDescription
limitinteger
subjectstring

No output schema declared.

No examples provided.

get_entity_metrics ~106

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.

NameTypeReqDescription
entitystringyes
entity_kindstring
metricstring
scopestring
seasoninteger

No output schema declared.

No examples provided.

get_metric_definition ~101

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.

NameTypeReqDescription
metricstringyes

No output schema declared.

No examples provided.

list_metrics ~84

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.

NameTypeReqDescription
detailboolean
entity_kindstring
limitinteger
searchstring
seasoninteger

No output schema declared.

No examples provided.

query_stat_leaders ~92

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.

NameTypeReqDescription
entity_kindstring
limitinteger
metricstringyes
orderstring
positionstring
seasoninteger

No output schema declared.

No examples provided.

run_stat_query ~407

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.

NameTypeReqDescription
measureobjectyes
opyes
populationobjectyes
scoringstring
windowyes

No output schema declared.

No examples provided.

sleeper_find_leagues ~57

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.

NameTypeReqDescription
seasonstring
usernamestringyes

No output schema declared.

No examples provided.

sleeper_get_league ~52

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.

NameTypeReqDescription
league_idstringyes

No output schema declared.

No examples provided.

sleeper_matchup_preview ~71

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.

NameTypeReqDescription
league_idstringyes
teamstringyes
weekinteger

No output schema declared.

No examples provided.

sleeper_roster_stories ~57

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.

NameTypeReqDescription
league_idstringyes
teamstringyes

No output schema declared.

No examples provided.

sleeper_standings_story ~56

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.

NameTypeReqDescription
league_idstringyes

No output schema declared.

No examples provided.

verify_claim ~58

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.

NameTypeReqDescription
claimsarrayyes

No output schema declared.

No examples provided.

Common questions

What is the Muffed — verified NFL stats and fantasy context MCP server?

Muffed — verified NFL stats and fantasy context is an MCP server listed in the public MCP registry as ai.muffed/muffed. Verified NFL stats and Sleeper league context. Every figure carries its own source rank. This page covers its hosted endpoint (https://muffed.ai/api/mcp).

Is the Muffed — verified NFL stats and fantasy context MCP server safe to use?

Muffed — verified NFL stats and fantasy context scores 81 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

What tools does the Muffed — verified NFL stats and fantasy context MCP server expose?

Muffed — verified NFL stats and fantasy context exposes 14 tools: get_current_insights, query_stat_leaders, get_entity_metrics, compare_entities, get_metric_definition, and 9 more. Their descriptions and schemas cost roughly 1,421 tokens of context every time the server is loaded.

Does the Muffed — verified NFL stats and fantasy context MCP server require authentication?

No. We connected to Muffed — verified NFL stats and fantasy context without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

Is the Muffed — verified NFL stats and fantasy context MCP server still maintained?

Muffed — verified NFL stats and fantasy context is still listed as active in the MCP registry. We last reached this channel on 22 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.