What is tokenbowl-mcp CLAUDE.md?

Project instructions for Token Bowl MCP, a server that connects AI assistants to fantasy football league data from the Sleeper API. MCP is a standard way for AI tools to call external functions.

Use them to build, test, configure, and maintain the server's fantasy football league and player-data tools.

They explain the server's architecture, configuration, reusable logic, caching, validation, and development commands so changes fit the existing project.

How GregBaugues/tokenbowl-mcp configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to GregBaugues/tokenbowl-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/GregBaugues/tokenbowl-mcp/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/GregBaugues/tokenbowl-mcp

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

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Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

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Per session 2,532 This file is loaded in full into every session.

When invoked 2,532 The same file — it is already loaded in full.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.02532	$0.02532
Opus 5	$0.01266	$0.01266
Sonnet 5	$0.00506	$0.00506
Haiku 4.5	$0.00253	$0.00253

Measured 9d ago against content hash 6594e834dcf8, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

tokenbowl-mcp CLAUDE.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

CLAUDE.md · 279 lines

How it starts

The opening of the file, as written. The whole thing — 279 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

Project Overview

This is the Token Bowl MCP server - a Model Context Protocol server for fantasy football leagues using the Sleeper Fantasy Sports API. Built with FastMCP, it defaults to the Token Bowl league (ID: 1266471057523490816) but can be configured for any league via the SLEEPER_LEAGUE_ID environment variable. Provides 27 tools to interact with fantasy football data.

Context: This is part of the larger tokenbowl system - an LLM-powered fantasy football league management system.

Architecture

The codebase follows a modular architecture with clear separation of concerns:

MCP Tool Layer (sleeper_mcp.py) - Tool definitions and interfaces (~2,400 lines)
Business Logic Layer (lib/) - Reusable modules for core functionality
- validation.py - Parameter validation utilities
- decorators.py - MCP tool decorator (logging, error handling)
- enrichment.py - Player data enrichment functions
- league_tools.py - League operation business logic
Cache Layer (cache_client.py, build_cache.py) - Redis-backed player data caching
Test Layer (tests/) - 166 comprehensive tests

This modular design enables:

Independent testing of business logic
Code reuse across tools
Clear separation between MCP framework and business logic
Easy maintenance and refactoring

Directory Structure

sleeper-mcp/
├── sleeper_mcp.py           # MCP tool definitions (~2,400 lines)
├── lib/                     # Reusable business logic modules
│   ├── __init__.py          # Module exports
│   ├── validation.py        # Parameter validation (190 lines)
│   ├── decorators.py        # MCP tool decorator (137 lines)
│   ├── enrichment.py        # Player enrichment (401 lines)
│   └── league_tools.py      # League operations (373 lines)
├── cache_client.py          # Cache interface
├── build_cache.py           # Cache building functions
├── scripts/                 # Utility scripts
│   ├── manual_cache_refresh.py
│   ├── parse_trade_proposal.py
│   └── extract_trade_proposal.py
├── data/                    # Data files and analyses
├── picks/                   # Weekly picks (week1, week2, etc.)
├── slopups/                 # Weekly summaries
├── scratchpads/             # Development notes and issues
├── tests/                   # Test suite (166 tests, 9 files)
└── .github/workflows/       # CI/CD configuration

Read the full file on GitHub · 279 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

9d ago First seen · 279 lines · 2,532 tokens per session scan A 6594e834dcf8

Subscribe to this mod's changes

tokenbowl-mcp CLAUDE.md is an instructions file published in the GitHub repository GregBaugues/tokenbowl-mcp (6 stars, last pushed 8mo ago), licensed MIT. It adds 2,532 tokens to every session, about $0.0127 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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tokenbowl-mcp: Instructions file for Claude Code