What is fartlek CLAUDE.md?

A set of Claude Code instructions for the Fartlek Garmin MCP server project. It defines the project's language rules, documentation sources, architecture guidance, commands, and Git practices.

Use it when working on the Fartlek repository to follow its design documents, pick up current project state, run the expected checks, and make focused commits.

It gives an agent project-specific rules and handoff information, reducing the chance of inconsistent code, documentation, or commits.

How matisdsp/fartlek configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to matisdsp/fartlek. 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/matisdsp/fartlek/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/matisdsp/fartlek

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/matisdsp/fartlek/claude-md/github.svg)](https://agentmods.dev/instructions/matisdsp/fartlek/claude-md)

Your own site

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

Per session 941 This file is loaded in full into every session.

When invoked 941 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	$0.00941	$0.00941
Opus 5.5	$0.00376	$0.00376
Sonnet 5.5	$0.00188	$0.00188
Haiku 4.5	$0.00094	$0.00094

Measured 2mo ago against content hash f3063d21a53b, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

fartlek 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 · 53 lines

How it starts

The opening of the file, as written. The whole thing — 53 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Fartlek — Garmin MCP server

A coach's morning report from your Garmin data, for any LLM via MCP. Open-source project. The authoritative spec is docs/DESIGN.md; the phase plan is ROADMAP.md.

Language: English only. This is a public open-source repo — write everything in English: code, identifiers, comments, docstrings, user-facing strings, commit messages (subject and body), and docs. The sole exception is quoted foreign-language content that is itself the subject under test (e.g. the French eval task in docs/EVAL.md that checks numbers survive translation).

Picking up the project? Start with docs/HANDOFF.md — current state, verified facts, invariants, and the traps that cost time. Phases 0–2 are done (v0.2.0 on PyPI); Phase 3 is next.

Git discipline — commit as you go

Commit incrementally, as soon as a coherent change is done and verified. Do not accumulate a large uncommitted working tree.

One logical change = one commit (a module, a new tool, a fix — not "misc").
Verify before committing (run the relevant tests; for the MCP server, the standalone JSON-RPC check below).
Concise imperative messages, scoped: analytics: add PMC engine, store: fix WAL busy timeout.
Never commit secrets or tokens (~/.fartlek/, garmin_tokens.json).

Architecture

fartlek/health/ — Garmin data access. ports.py (GarminPort protocol) → adapters/garmin_connect.py (garminconnect lib, sync calls in asyncio.to_thread behind a lock + cross-process fcntl token lock) → service.py (field filtering). Consumers go through HealthService, never the adapter.
fartlek/mcp_server/server.py — FastMCP stdio server. stdout is reserved for JSON-RPC; log to stderr only.
fartlek/cli.py — fartlek auth/doctor/accounts/reset. The only place credentials are typed.
fartlek/paths.py — filesystem layout (~/.fartlek/, override FARTLEK_HOME; tokens override GARMINTOKENS).
Phase 0 adds: fartlek/store/ (per-account SQLite), fartlek/sync/ (fetch + digestion engine), fartlek/analytics/ (deterministic metrics), fartlek/render/ (budgeted verdict renderer). Specs: DESIGN.md §3 and §5.

Read the full file on GitHub · 53 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 · 53 lines · 941 tokens per session scan A f3063d21a53b

Subscribe to this mod's changes

fartlek CLAUDE.md is an instructions file published in the GitHub repository matisdsp/fartlek (0 stars, last pushed 2mo ago), licensed Apache-2.0. It adds 941 tokens to every session, about $0.0038 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.

Git and workflow

fartlek CLAUDE.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
fartlek CLAUDE.mdmatisdsp/fartlek	Instructions file	0	2mo ago	Apache-2.0	A	941	Claude Code
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	yesterday	MIT	A	7,461	Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	yesterday	MIT	A	4,680	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	5,516	GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	3,093	GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	274k	2d ago	MIT	A	4,313	Codex, OpenCode

fartlek: Instructions file for Claude Code