swisstopo-mcp: Instructions file for Claude Code

CLAUDE.md

swisstopo-mcp CLAUDE.md is an instructions file for Claude Code from malkreide/swisstopo-mcp. It costs 5,638 tokens per session, scanned A, original, MIT.

Repository instructions for the swisstopo-mcp project, covering how to update the checkout, follow shared conventions, run the required tests, and investigate failures. A repository is the project folder containing its code and history.

In plain words
What is it for?
Use them before making changes to swisstopo-mcp, especially when fetching updates, identifying the default branch, running the pinned checks, and diagnosing red CI results.
Why use it?
They help contributors avoid testing an outdated copy, using the wrong default branch, or treating a failing check as an unexplained code problem.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md. Also seen: mentions CLAUDE.md; mentions Codex.

This is malkreide/swisstopo-mcp's own configuration. It tells Claude Code how to work on swisstopo-mcp itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything swisstopo-mcp configures →

Reuse

Borrowing it

Nothing to install: this file belongs to malkreide/swisstopo-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/malkreide/swisstopo-mcp/master/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/malkreide/swisstopo-mcp

Made for: Claude Code.

Wrote this? Show the measurements

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Per session 5,638 This file is loaded in full into every session.
When invoked 5,638 The same file — it is already loaded in full.
Security scan A 1 finding. 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.05638 $0.05638
Opus 5 $0.02819 $0.02819
Sonnet 5 $0.01128 $0.01128
Haiku 4.5 $0.00564 $0.00564

Measured 9d ago against content hash 6fe25d990ec8, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

swisstopo-mcp CLAUDE.md scanned grade A with 1 finding 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.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

Token aus der Umgebung in einen curl-Header zu setzen, blockiert der
Origin

Copies of this mod

8 near-identical copies found in the catalogue:

CLAUDE.md · 424 lines

How it starts

The opening of the file, as written. The whole thing — 424 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

Teil 1 — Konventionen (portfolio-weit)

Vor der Arbeit

Klon-Aktualität prüfen — Standard-Branch ermitteln, nicht main annehmen:

B=$(git ls-remote --symref origin HEAD | sed -n 's|^ref: refs/heads/\([^[:space:]]*\).*|\1|p')
git fetch origin "${B:?Standard-Branch nicht ermittelbar}" &&
  git rev-list --count HEAD..FETCH_HEAD

Drei Server im Portfolio heissen ihren Standard-Branch master (openlex-mcp, swiss-courts-mcp, swisstopo-mcp); dort scheitert ein fest verdrahtetes origin/main mit «couldn't find remote ref main». Wer das für ein Netzproblem hält, arbeitet weiter auf genau dem veralteten Klon, vor dem dieser Absatz warnt. Den :?-Schutz nicht weglassen: Bei leerem B fetcht git still den Remote-HEAD und endet mit 0.

Ein veralteter Klon erzeugt eine rote CI, deren Ursache nicht im Diff steht. Am 3.8.2026 zweimal passiert — beide Male fehlten genau die Commits, die das Gate einführten, an dem der Branch scheiterte.

Gates lokal fahren, mit der GEPINNTEN ruff-Version aus der CI. Eine andere Version meldet Abweichungen, die niemand verursacht hat.

Tests

Gegenprobe ist Pflicht. Ein Test, der grün bleibt, wenn man die Implementierung entfernt, prüft nichts. Jede neue Zusicherung einzeln neutralisieren und zeigen, dass genau die zugehörigen Tests fallen.

Zwei Fallen, die beide grün blieben:

  • Eine Fake-Uhr, die nur beim Schlafen vorrückt, kann eine Zusicherung über echte Zeit nicht widerlegen.
  • monkeypatch.setattr(modul.asyncio, "sleep", ...) greift ins Modul asyncio selbst und entschärft die Mechanik im ganzen Prozess. Patche einen Modul-Alias (_sleep = asyncio.sleep), nicht das fremde Modul.

Handgeschriebene Fixtures kodieren die Annahme des Autors und können sie nicht widerlegen. Mindestens eine aufgezeichnete Antwort pro externem Endpunkt, mit Aufnahmedatum.

Wenn etwas rot ist

Roter Live-Test: erst die Quelle abfragen, dann einordnen. Nicht aus der Fehlermeldung schliessen. Am 3.8.2026 hiess "nicht gefunden" nicht, dass der Datensatz weg war, sondern dass die Quelle die Schreibweise ihrer Kopfzeile gewechselt hatte — vier von sechs Datensätzen produktiv kaputt, alle Unit-Tests grün.

Read the full file on GitHub · 424 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.

  1. 9d ago First seen · 424 lines · 5,638 tokens per session scan A 6fe25d990ec8

Subscribe to this mod's changes

swisstopo-mcp CLAUDE.md is an instructions file published in the GitHub repository malkreide/swisstopo-mcp (9 stars, last pushed 7d ago), licensed MIT. It adds 5,638 tokens to every session, about $0.0282 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

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