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.
npx agentmods add skills/ludo-technologies/python-best-practices/testingnpx skills add ludo-technologies/python-best-practices --skill testinggit clone --depth 1 https://github.com/ludo-technologies/python-best-practicesWhat 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 | $0.00047 | $0.00969 |
| Opus 5 | $0.00023 | $0.00485 |
| Sonnet 5 | $0.00009 | $0.00194 |
| Haiku 4.5 | $0.00005 | $0.00097 |
Grade A, and why
testing 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.
How it starts
The opening of the file, as written. The whole thing — 119 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Python Testing
A collection of test-writing best practices for pytest. Designed for AI agents and LLMs to write readable, maintainable, and trustworthy tests.
Categories
Mocking [CRITICAL]
Mock external boundaries only, and keep mocks faithful to real interfaces.
| Rule | Description |
|---|---|
| mock-boundaries | Mock external boundaries, not internal logic |
| mock-autospec | Use autospec to keep mocks faithful to real signatures |
| mock-monkeypatch | Use monkeypatch for env vars and attributes |
Test Structure [HIGH]
Structure tests so failures are easy to diagnose.
| Rule | Description |
|---|---|
| struct-aaa-pattern | Structure tests as Arrange-Act-Assert |
| struct-test-naming | Name tests after the behavior they verify |
| struct-one-behavior | Test one behavior per test |
| struct-no-logic | Keep conditionals and loops out of tests |
Fixtures [HIGH]
Share setup without hiding it.
| Rule | Description |
|---|---|
| fixture-scope | Use the narrowest fixture scope that works |
| fixture-conftest | Place fixtures in the nearest conftest.py |
| fixture-factory | Use factory fixtures for varied test data |
Parametrization [MEDIUM]
Eliminate duplicated tests without hiding cases.
| Rule | Description |
|---|---|
| param-parametrize | Replace duplicated tests with parametrize |
| param-ids | Give parametrized cases readable ids |
Quick Reference
Structure Patterns
def test_expired_token_is_rejected() -> None:
# Arrange
token = make_token(expires_at=YESTERDAY)
# Act
result = validate(token)
# Assert
assert result.valid is False
What ships with it
16 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.
- metadata.json 734 B
- README.md 2.6 KB
- rules/_sections.md 1.6 KB
- rules/_template.md 447 B
- rules/fixture-conftest.md 2.4 KB
- rules/fixture-factory.md 2.4 KB
- rules/fixture-scope.md 2.3 KB
- rules/mock-autospec.md 2.0 KB
- rules/mock-boundaries.md 2.3 KB
- rules/mock-monkeypatch.md 2.3 KB
- rules/param-ids.md 2.1 KB
- rules/param-parametrize.md 2.3 KB
- rules/struct-aaa-pattern.md 1.9 KB
- rules/struct-no-logic.md 2.3 KB
- rules/struct-one-behavior.md 2.0 KB
- rules/struct-test-naming.md 1.7 KB
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.
- yesterday First seen · 119 lines · 47 tokens per session scan A 81c321afdaa2
testing is a skill published in the GitHub repository ludo-technologies/python-best-practices (18 stars, last pushed 3d ago), licensed MIT. It adds 47 tokens to every session and 969 once invoked, about $0.0002 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.
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