What is pitwall CLAUDE.md?

Project instructions for Pitwall, a tool server that lets Claude access Formula 1 data. It covers the project’s design, data sources, live race feeds, and F1 TV login.

Use it when changing Pitwall’s data tools, live timing, telemetry, compression, race-data merging, or F1 TV authentication.

It gives an agent the context needed to work on the project without guessing how its parts or data access work.

How darshjoshi/pitwall configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to darshjoshi/pitwall. 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/darshjoshi/pitwall/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/darshjoshi/pitwall

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

[![agentmods](https://agentmods.dev/badge/instructions/darshjoshi/pitwall/claude-md/github.svg)](https://agentmods.dev/instructions/darshjoshi/pitwall/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/darshjoshi/pitwall/claude-md"><img src="https://agentmods.dev/badge/instructions/darshjoshi/pitwall/claude-md/github.svg" alt="Measured on agentmods" height="20"></a>

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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/darshjoshi/pitwall/claude-md"><img src="https://agentmods.dev/badge/instructions/darshjoshi/pitwall/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 1,019 This file is loaded in full into every session.

When invoked 1,019 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	$0.01019	$0.01019
Opus 5.5	$0.00408	$0.00408
Sonnet 5.5	$0.00204	$0.00204
Haiku 4.5	$0.00102	$0.00102

Measured 2mo ago against content hash b65797e47059, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

pitwall 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 2mo 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 · 78 lines

How it starts

The opening of the file, as written. The whole thing — 78 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md — Pitwall Project

What This Is

Pitwall is an F1 MCP server with 79 tools. It provides Formula 1 data to Claude via the Model Context Protocol.

Key Architecture

pitwall.py — MCP server (79 tools). Auto-degrades: 30 tools without FastF1 (incl. 16 no-auth live-timing tools), 79 with it. Live car telemetry + GPS are auth-gated and full-only.
signalr_client.py — Raw SignalR Core WebSocket client for live race data during sessions.
decompressor.py — Zlib decompression for CarData.z (telemetry) and Position.z (GPS).
merger.py — Deep-merge for F1's incremental JSON delta format.
topics.py — All 20 SignalR topics with auth/compression metadata.
auth_setup.py — F1 TV Premium token setup (browser OAuth flow).

Data Sources (all free, no API keys)

F1 Static API (livetiming.formula1.com/static/) — 33 feeds per session, 2018-present
Jolpica-F1 (api.jolpi.ca/ergast/f1/) — Historical results 1950-present
FastF1 (optional) — Enhanced telemetry, plots, deep analysis
SignalR Core (live) — Real-time during races, requires F1 TV auth for telemetry

F1 TV Authentication

Token stored at ~/.f1token and ~/Library/Application Support/fastf1/f1auth.json. Expires every ~4 days. Re-authenticate: python3 auth_setup.py. Only needed for live telemetry (CarData.z, Position.z) during active sessions. All post-session and historical data is free without auth.

Sprint Weekend Gotcha

At sprint weekends, both Sprint and Race have Type="Race" in F1's data. The session resolver uses 3-pass priority (exact name > partial name > type) to correctly resolve "Race" to the main Race, not the Sprint. If you hit issues, pass the explicit session_path from list_races.

Dependency Pin — Do Not Loosen

mcp is pinned >=1.0.0,<2 in pyproject.toml and both requirements files. MCP Python SDK 2.0 removed mcp.server.fastmcp, which every one of the 79 tools is built on. Dropping the <2 ships a package that dies on import for every new user (this happened in 1.1.0). Lifting the pin means porting all 79 tools to mcp.server.mcpserver.MCPServer first.

Read the full file on GitHub · 78 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.

2mo ago First seen · 78 lines · 1,019 tokens per session scan A b65797e47059

Subscribe to this mod's changes

pitwall CLAUDE.md is an instructions file published in the GitHub repository darshjoshi/pitwall (9 stars, last pushed 3mo ago), licensed MIT. It adds 1,019 tokens to every session, about $0.0041 per session on Opus 5.5. 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.

claude f1 fastf1 formula1 mcp mcp-server

pitwall CLAUDE.md next to 6 instructions from other repositories
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pitwall: Instructions file for Claude Code