hello-python

A small, read-only example skill for auditing Python files in a project. It lists Python modules, looks for matching test files, and reports modules without an associated test.

In plain words
What is it for?
Checking Python test coverage at a basic file-association level and producing findings with evidence from existing file paths.
Why use it?
It shows how a skill can make findings only from files it has actually read. It also prevents unsafe actions such as running code, opening URLs, installing packages, or editing files.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/cherridsaid/phases-agents/hello-python
Any agent
npx skills add Cherridsaid/phases-agents --skill hello-python
Clone the repo
git clone --depth 1 https://github.com/Cherridsaid/phases-agents

Made for: Claude Code, Codex.

Per session 14 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 419 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00014 $0.00419
Opus 5 $0.00007 $0.00210
Sonnet 5 $0.00003 $0.00084
Haiku 4.5 $0.00001 $0.00042

Measured yesterday against content hash 0e0966b0227f, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

hello-python 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 yesterday.

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.

examples/skills/hello-python/SKILL.md · 71 lines

What it actually says

hello-python

Skill minimal complet : copiez ce dossier pour démarrer le vôtre.

Loi centrale

Ne conclure que sur un fichier réellement lu. Aucune supposition.

Ce que ce skill fait

Inventorie les fichiers Python du projet et signale les modules sans test associé.

Ce que ce skill ne fait pas

Il n'exécute aucun code, n'installe rien et ne modifie aucun fichier.

Conditions d'activation

Le profil du projet contient le fait has_python.

Conditions d'exclusion

Aucun fichier .py lisible dans la cible.

Capacites necessaires

filesystem_read est obligatoire. filesystem_search accélère l'inventaire.

Interdictions

Ne jamais ouvrir une URL, lancer un interpréteur ou écrire dans la cible.

Methode d'audit

  1. Lister les fichiers .py.
  2. Repérer les fichiers test_*.py.
  3. Associer chaque module à son test.
  4. Émettre un finding par module non couvert.

Contrat de preuve

Chaque finding cite un chemin relatif existant. Sans chemin lu, le finding est invalide.

Format de sortie

Un tableau de findings conformes à core:FINDING_SCHEMA.json.

Conditions de blocage

Cible illisible ou profil bloqué : rendre BLOCKED, ne rien deviner.

Limites connues

L'association module/test est nominale : un test placé ailleurs n'est pas vu.

Exemples d'entree

Un projet contenant app.py, utils.py et tests/test_app.py.

Exemple de sortie attendue

Un finding EX-001 : utils.py n'a pas de test associé, sévérité P3_LOW, preuve = chemin du module.

Files

What ships with it

5 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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. yesterday First seen · 71 lines · 14 tokens per session scan A 0e0966b0227f

Subscribe to this mod's changes

hello-python is a skill published in the GitHub repository Cherridsaid/phases-agents (0 stars, last pushed 5d ago), licensed Apache-2.0. It adds 14 tokens to every session and 419 once invoked, about $0.0001 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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