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/paruff/ufawkesai/lang-pythonnpx skills add paruff/uFawkesAI --skill lang-pythongit clone --depth 1 https://github.com/paruff/uFawkesAIWrote 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.
[](https://agentmods.dev/skills/paruff/ufawkesai/lang-python)<a href="https://agentmods.dev/skills/paruff/ufawkesai/lang-python"><img src="https://agentmods.dev/badge/skills/paruff/ufawkesai/lang-python.svg" alt="Measured on agentmods" height="20"></a>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 | $0.00044 | $0.00898 |
| Opus 5 | $0.00022 | $0.00449 |
| Sonnet 5 | $0.00009 | $0.00180 |
| Haiku 4.5 | $0.00004 | $0.00090 |
Grade A, and why
lang-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.
How it starts
The opening of the file, as written. The whole thing — 113 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill: Language — Python
Load trigger:
"load lang-python skill"> Stack: Python 3.11+, ruff, mypy, pytest, pytest-cov, uv or pip Token cost: Low
Toolchain Reference
| Gate | Tool | Command | Config file |
|---|---|---|---|
| Lint | ruff | ruff check . |
pyproject.toml [tool.ruff] |
| Format | ruff | ruff format . |
pyproject.toml [tool.ruff.format] |
| Typecheck | mypy | mypy src/ |
pyproject.toml [tool.mypy] |
| Test | pytest | pytest |
pyproject.toml [tool.pytest.ini_options] |
| Coverage | pytest-cov | pytest --cov=src --cov-report=term-missing |
.coveragerc |
| Preflight | shell | ./scripts/preflight.sh |
scripts/preflight.sh |
File Layout Convention
src/
[package_name]/
__init__.py
services/ ← business logic
utils/ ← pure functions
models/ ← data models (Pydantic or dataclasses)
api/ ← HTTP handlers / FastAPI routers
tests/
test_services/ ← mirrors src/services/
test_utils/ ← mirrors src/utils/
conftest.py ← shared fixtures
pyproject.toml ← all tool config here (not setup.py)
CI Gate Commands (ci-quality.yml)
- name: Set up Python
uses: actions/setup-python@v5
with:
python-version: "3.11"
- name: Install dependencies
run: pip install -e ".[dev]"
- name: Lint
run: ruff check .
- name: Typecheck
run: mypy src/
- name: Test with coverage
run: pytest --cov=src --cov-fail-under=80 --cov-report=xml
Type Standards
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 · 113 lines · 44 tokens per session scan A 29ccb52d899d
lang-python is a skill published in the GitHub repository paruff/uFawkesAI (2 stars, last pushed 12d ago), licensed MIT. It adds 44 tokens to every session and 898 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 2026-09-03.
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