Sleeper MCP Server

A Model Context Protocol (MCP) server that provides Claude Desktop with access to Sleeper Fantasy Football API data. This server enables users to query league information, player data, matchups, and draft results through natural language interactions with Claude.

Features

• League Management: Query leagues, rosters, users, and league settings

• Draft Analysis: Complete draft results with pick positions, keeper status, and team attribution

  • Full draft history with all rounds and picks

  • Player draft metadata showing original draft position and team

  • Keeper identification with 🔒 indicators

  • Free agent tracking for undrafted players

• Player Information: Search players, get statistics, and trending data

• Matchup Analysis: View current and historical matchups with real-time scoring

• Intelligent Caching: Optimized API usage with TTL-based caching

• Rate Limiting: Respects Sleeper API limits with exponential backoff

Related MCP server: yahoo-fantasy-mcp

Installation

Prerequisites

• Python 3.10 or higher

• Claude Desktop application

Install from Source

1. Clone the repository:

git clone <repository-url>
cd sleeper-mcp-server

2. Install the package:

pip install -e .

3. For development with testing and linting tools:

pip install -e ".[dev]"

Configuration

Claude Desktop MCP Configuration

Add the following configuration to your Claude Desktop MCP settings file:

Location of config file:

• macOS: ~/Library/Application Support/Claude/claude_desktop_config.json

• Windows: %APPDATA%\Claude\claude_desktop_config.json

• Linux: ~/.config/Claude/claude_desktop_config.json

Basic Configuration:

{
  "mcpServers": {
    "sleeper": {
      "command": "python",
      "args": ["-m", "sleeper_mcp_server"],
      "disabled": false,
      "autoApprove": [
        "get_user_leagues",
        "get_league_info",
        "search_players",
        "get_trending_players",
        "get_nfl_state"
      ]
    }
  }
}

Auto-approving every tool:

{
  "mcpServers": {
    "sleeper": {
      "command": "python",
      "args": ["-m", "sleeper_mcp_server"],
      "disabled": false,
      "autoApprove": [
        "get_user_leagues",
        "get_league_info",
        "get_league_rosters",
        "get_league_rosters_with_draft_info",
        "get_league_users",
        "get_roster_user_mapping",
        "get_league_draft",
        "search_players",
        "get_trending_players",
        "get_player_stats",
        "get_matchups",
        "get_matchup_scores",
        "get_nfl_state"
      ]
    }
  }
}

Available MCP Tools

League Tools

get_user_leagues

Get all leagues for a username in a specific season.

Parameters:

• username (required): Sleeper username to look up

• season (optional): Season year (defaults to current season)

Example Usage:

Show me all leagues for username "john_doe"
Show me all leagues for username "john_doe" in 2025

get_league_info

Get detailed information about a specific league.

Parameters:

• league_id (required): League ID to retrieve information for

Example Usage:

Get information for league ID "123456789"

get_league_rosters

Get all team rosters in a league.

Parameters:

• league_id (required): League ID to retrieve rosters for

Example Usage:

Show me all rosters in league "123456789"

get_league_users

Get all users/participants in a league.

Parameters:

• league_id (required): League ID to retrieve users for

Example Usage:

Who are the users in league "123456789"?

get_league_rosters_with_draft_info

Get all team rosters in a league with complete draft position metadata for each player.

Parameters:

• league_id (required): League ID to retrieve rosters for

Example Usage:

Show me all rosters with draft information for league "123456789"

get_roster_user_mapping

Get a clear mapping of roster IDs to user names for a league.

Parameters:

• league_id (required): League ID to get roster-user mapping for

Example Usage:

Show me the roster to user mapping for league "123456789"

get_league_draft

Get complete draft results and pick information for a league.

Parameters:

• league_id (required): League ID to get draft information for

Example Usage:

Show me the draft results for league "123456789"

Player Tools

search_players

Search for players by name with optional position filtering.

Parameters:

• query (required): Player name or partial name to search for

• position (optional): Position filter (QB, RB, WR, TE, K, DEF)

Example Usage:

Search for players named "Josh Allen"
Find all quarterbacks with "Josh" in their name

get_trending_players

Get trending players (most added/dropped).

Parameters:

• sport (optional): Sport type (default: "nfl")

• add_drop (optional): Type of trend - "add" or "drop" (default: "add")

Example Usage:

Show me the most added players this week
What players are being dropped the most?

get_player_stats

Get player statistics for a specific season and optional week.

Parameters:

• player_id (required): Player ID to get stats for

• season (optional): Season year (defaults to current season)

• week (optional): Week number within the season

Example Usage:

Get stats for player ID "4046"
Get stats for player ID "4046" in week 5

Matchup Tools

get_matchups

Get matchups for a specific week in a league.

Parameters:

• league_id (required): League ID to retrieve matchups for

• week (required): Week number (1-22)

Example Usage:

Show me week 5 matchups for league "123456789"

get_matchup_scores

Get real-time scoring information for matchups in a specific week.

Parameters:

• league_id (required): League ID to retrieve scores for

• week (required): Week number (1-22)

Example Usage:

What are the current scores for week 8 in league "123456789"?

State Tools

get_nfl_state

Get the current NFL state including season, week, and season type.

Parameters:

• None

Example Usage:

What's the current NFL week?
What season are we in?

API Rate Limiting and Caching

Rate Limiting

The server implements intelligent rate limiting to respect Sleeper API guidelines:

• Rate Limit: Follows Sleeper's documented rate limits

• Retry Logic: Exponential backoff (1s, 2s, 4s, 8s) for rate-limited requests

• Queue Management: Requests are queued during rate limit periods

• User Feedback: Clear messages when rate limits are encountered

Caching Strategy

Different data types have optimized cache TTL values:

Cache Features:

• In-memory caching for optimal performance

• TTL-based expiration

• Automatic cache invalidation

• Cache hit/miss logging for monitoring

Usage Examples

Basic League Queries

# Get your leagues
"Show me all leagues for username 'myusername'"

# Get league details
"What are the settings for league ID '123456789'?"

# View rosters
"Show me all the rosters in my main league"

# View rosters with draft information
"Show me all rosters with draft info - I want to see where each player was drafted and by whom"

Player Research

# Search for players
"Find all players named 'Cooper'"

# Get trending players
"What players are being added the most this week?"

# Player statistics
"Show me Josh Allen's stats"
"Show me Josh Allen's stats for week 5"

Matchup Analysis

# Current week matchups
"What are this week's matchups in my league?"

# Live scoring
"What are the current scores for week 8?"

# Historical data
"Show me the results from week 3"

Draft Analysis

# Complete draft results
"Show me the draft results for my league"

# Roster with draft info
"Show me all rosters with draft information - I want to see where each player was drafted"

# Keeper analysis
"Which players were kept from last year and what was their original draft cost?"

# Draft value analysis
"Show me players who are outperforming their draft position"

Troubleshooting

Common Issues

1. Server Won't Start

Symptoms:

• Claude Desktop shows "Server unavailable" error

• No response from MCP tools

Solutions:

• Verify Python installation: python --version (should be 3.10+)

• Check package installation: pip show sleeper-mcp-server

• Verify Claude Desktop configuration syntax

• Check logs for specific error messages

2. Authentication/API Errors

Symptoms:

• "API request failed" errors

• "Invalid league ID" messages

Solutions:

• Verify league IDs are correct (18-character strings)

• Check username spelling and case sensitivity

• Ensure Sleeper API is accessible from your network

• Try again after a few minutes (may be temporary API issues)

3. Rate Limiting Issues

Symptoms:

• "Rate limit exceeded" messages

• Slow response times

• "Please wait" messages

Solutions:

• Wait for the specified retry period

• Reduce frequency of requests

• Use cached data when possible

• Check if multiple instances are running

4. Cache Issues

Symptoms:

• Stale data being returned

• Inconsistent results

Solutions:

• Restart the MCP server to clear cache

• Adjust the TTL constants in sleeper_mcp_server/cache.py

• Check system memory availability

5. Configuration Problems

Symptoms:

• Tools not appearing in Claude Desktop

Solutions:

• Validate JSON syntax in Claude Desktop config

• Restart Claude Desktop after configuration changes

• Check file permissions on config file

Logging

The server logs to stderr at INFO. The level is set in sleeper_mcp_server/__main__.py; there is no environment-variable override.

Getting Help

1. Check Logs: Read the server's stderr output for detailed error information

2. Verify Configuration: Ensure Claude Desktop MCP configuration is correct

3. Test API Access: Verify you can access Sleeper API directly

4. Update Dependencies: Ensure all packages are up to date

5. Restart Services: Try restarting both the MCP server and Claude Desktop

Performance Optimization

For Large Leagues

• Use position filtering in player searches

• Cache frequently accessed league data

• Limit historical matchup queries

For Multiple Leagues

• Batch similar requests when possible

• Use appropriate cache TTL settings

• Monitor rate limit usage

Development

Running Tests

# Run all tests
pytest

# Run with coverage
pytest --cov=sleeper_mcp_server

# Run specific test file
pytest tests/test_server.py

Code Quality

# Format code
black sleeper_mcp_server/

# Sort imports
isort sleeper_mcp_server/

# Lint code
flake8 sleeper_mcp_server/

# Type checking
mypy sleeper_mcp_server/

Contributing

1. Fork the repository

2. Create a feature branch

3. Make your changes

4. Add tests for new functionality

5. Ensure all tests pass

6. Submit a pull request

License

This project is licensed under the MIT License - see the LICENSE file for details.

Acknowledgments

• Sleeper API for providing comprehensive fantasy football data including detailed draft information

• Model Context Protocol for the MCP framework

• Claude Desktop for MCP integration

Support

For issues and questions:

1. Check the troubleshooting section above

2. Review existing GitHub issues

3. Create a new issue with detailed information about your problem

Note: This MCP server is not officially affiliated with Sleeper. It's a third-party integration that uses Sleeper's public API.