Muffed — verified NFL stats and fantasy context

Official13 tools

by muffed

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

MCP Server: ai.muffed/muffed

This MCP server provides verified NFL statistics along with Sleeper league context. Its description indicates that every figure includes its own source rank, tying returned data to an explicit provenance level for each metric.

🛠️ Key Features

Verified NFL stats
Sleeper league context
Per-figure source rank for returned figures

🚀 Use Cases

Looking up NFL statistical figures that are verified
Using stats in the context of Sleeper leagues

⚡ Developer Benefits

Source rank attached to each data figure
Clear association between metrics and their source standing

⚠️ Limitations

Limited public metadata provided: no tool list, topics, or README excerpt available from the provided data

Captured live from the server via tools/list.

get_current_insights

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.

Parameters2

limit	integer	optional
subject	string	optional

Raw schema

{
  "type": "object",
  "properties": {
    "limit": {
      "type": "integer",
      "minimum": 1,
      "maximum": 10
    },
    "subject": {
      "type": "string"
    }
  },
  "$schema": "https://json-schema.org/draft/2020-12/schema"
}

query_stat_leaders

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.

Parameters6

metric	string	required
season	integer	optional
position	string	optional
entity_kind	string	optional
limit	integer	optional
order	string	optional

Raw schema

{
  "type": "object",
  "properties": {
    "metric": {
      "type": "string"
    },
    "season": {
      "type": "integer",
      "minimum": 2016,
      "maximum": 2025
    },
    "position": {
      "type": "string"
    },
    "entity_kind": {
      "type": "string",
      "enum": [
        "player",
        "team",
        "route",
        "personnel_group",
        "box_count",
        "rusher_count",
        "coverage_type",
        "regression_rule",
        "metric",
        "league"
      ]
    },
    "limit": {
      "type": "integer",
      "minimum": 1,
      "maximum": 25
    },
    "order": {
      "type": "string",
      "enum": [
        "desc",
        "asc"
      ]
    }
  },
  "required": [
    "metric"
  ],
  "$schema": "https://json-schema.org/draft/2020-12/schema"
}

get_player_metrics

Every verified figure Muffed holds for one player or team, with the source's rank where one exists. Names are resolved before lookup; an unrecognised name returns the closest matches rather than a guess.

Parameters4

player	string	required
entity_kind	string	optional
metric	string	optional
season	integer	optional

Raw schema

{
  "type": "object",
  "properties": {
    "player": {
      "type": "string"
    },
    "entity_kind": {
      "type": "string",
      "enum": [
        "player",
        "team"
      ]
    },
    "metric": {
      "type": "string"
    },
    "season": {
      "type": "integer",
      "minimum": 2016,
      "maximum": 2025
    }
  },
  "required": [
    "player"
  ],
  "$schema": "https://json-schema.org/draft/2020-12/schema"
}

compare_entities

Two players or two teams shown side by side on the verified metrics both have, with each side's source rank. States both figures and stops: it names no winner, no margin and no recommendation.

Parameters5

a	string	required
b	string	required
entity_kind	string	optional
metrics	array	optional
season	integer	optional

Raw schema

{
  "type": "object",
  "properties": {
    "a": {
      "type": "string"
    },
    "b": {
      "type": "string"
    },
    "entity_kind": {
      "type": "string",
      "enum": [
        "player",
        "team"
      ]
    },
    "metrics": {
      "maxItems": 25,
      "type": "array",
      "items": {
        "type": "string"
      }
    },
    "season": {
      "type": "integer",
      "minimum": 2016,
      "maximum": 2025
    }
  },
  "required": [
    "a",
    "b"
  ],
  "$schema": "https://json-schema.org/draft/2020-12/schema"
}

get_metric_definition

What a verified metric measures, which seasons it actually covers, how it is ranked, its licence and its attribution. Season coverage is often narrower than a decade — rushing yards over expectation, for instance, exists from 2018 onward.

Parameters1

metric

string

required

Raw schema

{
  "type": "object",
  "properties": {
    "metric": {
      "type": "string"
    }
  },
  "required": [
    "metric"
  ],
  "$schema": "https://json-schema.org/draft/2020-12/schema"
}

list_metrics

The metric keys Muffed can answer on, with their labels and the seasons each one covers. Returns keys and coverage only, never figures.

Parameters4

entity_kind	string	optional
season	integer	optional
search	string	optional
limit	integer	optional

Raw schema

{
  "type": "object",
  "properties": {
    "entity_kind": {
      "type": "string",
      "enum": [
        "player",
        "team",
        "route",
        "personnel_group",
        "box_count",
        "rusher_count",
        "coverage_type",
        "regression_rule",
        "metric",
        "league"
      ]
    },
    "season": {
      "type": "integer",
      "minimum": 2016,
      "maximum": 2025
    },
    "search": {
      "type": "string",
      "maxLength": 64
    },
    "limit": {
      "type": "integer",
      "minimum": 1,
      "maximum": 200
    }
  },
  "$schema": "https://json-schema.org/draft/2020-12/schema"
}

verify_claim

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.

Parameters1

claims

array

required

Raw schema

{
  "type": "object",
  "properties": {
    "claims": {
      "minItems": 1,
      "maxItems": 25,
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "metric": {
            "type": "string"
          },
          "entity": {
            "type": "string"
          },
          "entity_kind": {
            "type": "string",
            "enum": [
              "player",
              "team",
              "route",
              "personnel_group",
              "box_count",
              "rusher_count",
              "coverage_type",
              "regression_rule",
              "metric",
              "league"
            ]
          },
          "season": {
            "type": "integer",
            "minimum": 2016,
            "maximum": 2025
          },
          "value": {
            "type": "number"
          }
        },
        "required": [
          "metric",
          "entity",
          "value"
        ]
      }
    }
  },
  "required": [
    "claims"
  ],
  "$schema": "https://json-schema.org/draft/2020-12/schema"
}

get_backfield

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.

Parameters1

team

string

required

Raw schema

{
  "type": "object",
  "properties": {
    "team": {
      "type": "string",
      "enum": [
        "ARI",
        "ATL",
        "BAL",
        "BUF",
        "CAR",
        "CHI",
        "CIN",
        "CLE",
        "DAL",
        "DEN",
        "DET",
        "GB",
        "HOU",
        "IND",
        "JAX",
        "KC",
        "LAC",
        "LAR",
        "LV",
        "MIA",
        "MIN",
        "NE",
        "NO",
        "NYG",
        "NYJ",
        "PHI",
        "PIT",
        "SEA",
        "SF",
        "TB",
        "TEN",
        "WAS"
      ]
    }
  },
  "required": [
    "team"
  ],
  "$schema": "https://json-schema.org/draft/2020-12/schema"
}

sleeper_find_leagues

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.

Parameters2

username	string	required
season	string	optional

Raw schema

{
  "type": "object",
  "properties": {
    "username": {
      "type": "string",
      "minLength": 1,
      "maxLength": 64
    },
    "season": {
      "type": "string",
      "pattern": "^\\d{4}$"
    }
  },
  "required": [
    "username"
  ],
  "$schema": "https://json-schema.org/draft/2020-12/schema"
}

sleeper_get_league

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.

Parameters1

league_id

string

required

Raw schema

{
  "type": "object",
  "properties": {
    "league_id": {
      "type": "string",
      "pattern": "^\\d{6,24}$"
    }
  },
  "required": [
    "league_id"
  ],
  "$schema": "https://json-schema.org/draft/2020-12/schema"
}

sleeper_matchup_preview

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.

Parameters3

league_id	string	required
team	string	required
week	integer	optional

Raw schema

{
  "type": "object",
  "properties": {
    "league_id": {
      "type": "string",
      "pattern": "^\\d{6,24}$"
    },
    "team": {
      "type": "string",
      "minLength": 1,
      "maxLength": 64
    },
    "week": {
      "type": "integer",
      "minimum": 1,
      "maximum": 18
    }
  },
  "required": [
    "league_id",
    "team"
  ],
  "$schema": "https://json-schema.org/draft/2020-12/schema"
}

sleeper_roster_stories

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.

Parameters2

league_id	string	required
team	string	required

Raw schema

{
  "type": "object",
  "properties": {
    "league_id": {
      "type": "string",
      "pattern": "^\\d{6,24}$"
    },
    "team": {
      "type": "string",
      "minLength": 1,
      "maxLength": 64
    }
  },
  "required": [
    "league_id",
    "team"
  ],
  "$schema": "https://json-schema.org/draft/2020-12/schema"
}

sleeper_standings_story

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.

Parameters1

league_id

string

required

Raw schema

{
  "type": "object",
  "properties": {
    "league_id": {
      "type": "string",
      "pattern": "^\\d{6,24}$"
    }
  },
  "required": [
    "league_id"
  ],
  "$schema": "https://json-schema.org/draft/2020-12/schema"
}

Install

Tools (13)

get_current_insightsquery_stat_leadersget_player_metricscompare_entitiesget_metric_definitionlist_metricsverify_claimget_backfield

Remote endpoint

Streamable HTTP

Hosted server - connect over the network, no local install.

url

https://muffed.ai/api/mcp

Add to VS Code Add to Cursor

claude_desktop_config.json

json

{
  "mcpServers": {
    "muffed": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-remote",
        "https://muffed.ai/api/mcp"
      ]
    }
  }
}

Desktop config is stdio-only; this bridges via mcp-remote. Native remote: Settings > Connectors.

Muffed — verified NFL stats and fantasy context - agentage MCP Catalog