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/jiatastic/open-python-skills/ruff-linternpx skills add jiatastic/open-python-skills --skill ruff-lintergit clone --depth 1 https://github.com/jiatastic/open-python-skillsWrote 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/jiatastic/open-python-skills/ruff-linter)<a href="https://agentmods.dev/skills/jiatastic/open-python-skills/ruff-linter"><img src="https://agentmods.dev/badge/skills/jiatastic/open-python-skills/ruff-linter.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 | $0.00074 | $0.02430 |
| Opus 5 | $0.00037 | $0.01215 |
| Sonnet 5 | $0.00015 | $0.00486 |
| Haiku 4.5 | $0.00007 | $0.00243 |
Grade A, and why
linting 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 3d 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.
How it starts
The opening of the file, as written. The whole thing — 326 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Ruff Linting
Ruff is an extremely fast Python linter designed as a drop-in replacement for Flake8 (plus dozens of plugins), isort, pydocstyle, pyupgrade, autoflake, and more. Written in Rust, it offers 10-100x performance improvements over traditional Python linters.
Overview
Ruff provides a single CLI for linting with optional auto-fix. It supports an extensive rule set with 800+ built-in rules and integrates cleanly with pre-commit, CI systems, and modern editors.
Key Features
- Extremely Fast: 10-100x faster than Flake8, Black, isort
- Drop-in Replacement: Compatible with existing Flake8 plugins and configurations
- Auto-fix Support: Automatically fix many common issues
- Comprehensive Rules: 800+ built-in rules from popular linters
- Single Tool: Replaces flake8, isort, pyupgrade, autoflake, pydocstyle, and more
When to Use
- Standardizing code quality across a project or team
- Enforcing consistent coding rules in CI/CD pipelines
- Replacing multiple linting tools with a single fast solution
- Auto-fixing common code style issues
- Migrating from Flake8, isort, or other legacy linters
Quick Start
# Install Ruff
uv pip install ruff
# or
pip install ruff
# Run linting on current directory
ruff check .
# Run linting with auto-fix
ruff check . --fix
# Watch mode for development
ruff check --watch
Core Patterns
- Start minimal: Enable
EandFrules first, then gradually expand - Auto-fix safely: Use
ruff check --fixfor safe fixes only - Per-file ignores: Use sparingly for generated code or special cases
- CI integration: Use
ruff check --output-format githubfor GitHub Actions - Single source of truth: Configure via
pyproject.tomlorruff.toml
Rule Selection
Ruff uses a code system where each rule consists of a 1-3 letter prefix followed by digits (e.g., F401). Rules are controlled via lint.select, lint.extend-select, and lint.ignore.
Recommended Rule Sets
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.
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.
- 3d ago First seen · 326 lines · 74 tokens per session scan A e4d99dbc5b2a
linting is a skill published in the GitHub repository jiatastic/open-python-skills (9 stars, last pushed 7mo ago), licensed MIT. It adds 74 tokens to every session and 2,430 once invoked, about $0.0004 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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