What is 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.

It builds a small inventory system, reviews the resulting Python file, and reports annotation-rule compliance and observations.

It provides a repeatable way to see whether the rule was followed and to record examples of correct or outdated code.

How jahands/prompts configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to jahands/prompts. 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/jahands/prompts/main/.claude/commands/test-python-rule.md

Clone the repo

git clone --depth 1 https://github.com/jahands/prompts

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/commands/jahands/prompts/test-python-rule/github.svg)](https://agentmods.dev/commands/jahands/prompts/test-python-rule)

Your own site

<a href="https://agentmods.dev/commands/jahands/prompts/test-python-rule"><img src="https://agentmods.dev/badge/commands/jahands/prompts/test-python-rule/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/commands/jahands/prompts/test-python-rule"><img src="https://agentmods.dev/badge/commands/jahands/prompts/test-python-rule.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

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. 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	$0.00016	$0.00570
Opus 5.5	$0.00006	$0.00228
Sonnet 5.5	$0.00003	$0.00114
Haiku 4.5	$0.00002	$0.00057

Measured 2mo ago against content hash a85566688cb9, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, 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 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/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.

2mo 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 1mo ago), licensed MIT. It adds 16 tokens to every session and 570 once invoked, about $0.0001 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 2026-08-30.

Languages Python

test-python-rule next to 6 commands from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
test-python-rulejahands/prompts	Command	19	1mo ago	MIT	A	16	Claude Code
type-coverageTheBeardedBearSAS/claude-craft	Command	107	3d ago	MIT	A	8	Claude Code
execute-pydantic-ai-prpcoleam00/context-engineering-intro	Command	14k	7mo ago	MIT	A	0	Claude Code
package-reviewoborchers/fractional-cto	Command	36	12d ago	MIT	A	41	Claude Code
fastapimfmezger/ai_agent_dotfiles	Command	7	3mo ago	MIT	A	84	Claude Code, Gemini CLI
savant-pythonrlaope/claude-code-savant	Command	2	8mo ago	MIT	A	7	Claude Code
python-reviewbcefghj/forks-collection	Command	5	7mo ago	none	A	31	Claude Code

prompts: Command for Claude Code