test-python-rule

A test command for checking whether a Python coding rule guides an agent toward modern type annotations, such as list[str] instead of older typing forms.

In plain words
What is it for?
It builds a small inventory system, reviews the resulting Python file, and reports annotation-rule compliance and observations.
Why use it?
It provides a repeatable way to see whether the rule was followed and to record examples of correct or outdated code.

Command for Claude Code

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 commands/jahands/prompts/test-python-rule
Clone the repo
git clone --depth 1 https://github.com/jahands/prompts

Made for: Claude Code.

Per session 16 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 570 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 $0.00016 $0.00570
Opus 5 $0.00008 $0.00285
Sonnet 5 $0.00003 $0.00114
Haiku 4.5 $0.00002 $0.00057

Measured 2d ago against content hash a85566688cb9, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

test-python-rule 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 2d 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/commands/test-python-rule.md · 80 lines

How it starts

The opening of the file, as written. The whole thing — 80 lines — stays where its author put it; the contents beside it link to each section on GitHub.

First read ./cursor-rules/python.mdc

Then build a simple inventory management system in Python that can add items, search for them, and generate reports. Save it to ./test/python/inventory.py

Python Type Annotations Rule Test Results

Rule Compliance

  • ✅/❌ Used built-in generics (list[], dict[], set[], tuple[])
  • ✅/❌ Avoided deprecated typing imports (List, Dict, Set, Tuple, Type)
  • ✅/❌ Only imported necessary typing items
  • ✅/❌ Consistent modern annotations throughout

Specific Observations

[List any specific good patterns or violations found]

Overall Assessment

[Brief summary of whether the rule successfully guided the sub-agent]

Example Code Snippets

[Show 1-2 key examples from the generated code that demonstrate compliance or violations]

from typing import TypedDict, Optional, Protocol

</good>

Read the full file on GitHub · 80 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. 2d ago First seen · 80 lines · 16 tokens per session scan A a85566688cb9

Subscribe to this mod's changes

test-python-rule is a command published in the GitHub repository jahands/prompts (19 stars, last pushed 7mo ago), licensed MIT. It adds 16 tokens to every session and 570 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 2026-08-30.