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 rules/cpuguy96/stepcovnet/python-stylegit clone --depth 1 https://github.com/cpuguy96/StepCOVNetWhat 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 | $0.00000 | $0.02302 |
| Opus 5 | $0.00000 | $0.01151 |
| Sonnet 5 | $0.00000 | $0.00460 |
| Haiku 4.5 | $0.00000 | $0.00230 |
Grade A, and why
python-style 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 — 212 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Python style
Applies to all Python in src/, scripts/, and tests/.
Follow the Google Python Style Guide for formatting and docstrings unless this file says otherwise.
Lint: After editing Python, run Ruff from the project venv at repo root (config in pyproject.toml). Use the same scope as CI (ruff check .), not only changed folders:
venv\Scripts\python.exe -m ruff check .
venv\Scripts\python.exe -m ruff format src scripts tests
venv\Scripts\pydoclint.exe src/stepcovnet/<package>/
venv\Scripts\pyright.exe src/stepcovnet/<package>/
Before push: venv\Scripts\python.exe pre_submit.py --fast for ruff; full pre_submit.py --skip-install before PR. Or install hooks once: pre-commit install --install-hooks --hook-type pre-commit.
Use a narrower path when scope is small. Fix any remaining diagnostics Ruff, pydoclint, and pyright report. Config: [tool.pydoclint] and [tool.pyright] in pyproject.toml.
Google Style Guide mapping
Follow the Google Python Style Guide unless this file or pyproject.toml says otherwise.
| Google topic | Enforced by | Notes / deviations |
|---|---|---|
| Line length (80 cols) | Ruff format (line-length = 88) |
88 columns — Black-compatible; do not wrap to 80 in new code. |
| Imports | Ruff I + PLC0415 + rules above |
Module-level only in src/; see exceptions table in Imports section. |
Naming (N) |
Ruff N |
N806 ignored for ML locals (X, y, …). |
PTH) |
Ruff PTH |
Full repo: ruff check . at repo root (same scope as CI). Fix violations in touched files; do not commit with a red tree. |
Simplify (SIM) |
Ruff SIM |
Prefer combined with contexts where Ruff suggests. |
| Docstrings (§3.8) | pydoclint + rules below | Google-style Args / Returns / Raises on public and _private functions; see docstring section. |
| Type hints (§2.22) | pyright (typeCheckingMode = basic) |
Run on packages you change; fix missing imports and obvious type errors. |
main() guard, exceptions, strings |
Agent review | No dedicated linter — match surrounding module style. |
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 · 212 lines · 0 tokens per session scan A 3bfed749dd75
python-style is a cursor rule published in the GitHub repository cpuguy96/StepCOVNet (21 stars, last pushed 7d ago), licensed Apache-2.0. It costs nothing until one of its globs matches a file; then it loads 2,302 tokens. 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.
Other cursor rules, from other repositories
typescript
Changes to these high-fan-out internals can affect every message, delta, element, or rerun. Keep work in them minimal, and benchmark changes with representative stress-test apps.
python_lib
Tips and guidelines specific to the development of the Streamlit Python library, not applicable to scripts and e2e tests.
specs
This directory contains product and tech specs for Streamlit features.
workflows
This folder contains all GitHub Actions workflows for the Streamlit repository. Workflows automate CI/CD, testing, releases, and maintenance tasks.
python_tests
We use the unit tests to cover internal behavior that can work without the web / backend counterpart. We aim for 95%+ unit test coverage of our Python code in lib/streamlit.
skills
This file provides guidance to AI coding agents (Claude Code, Cursor, Copilot, etc.) when working with skills in this repository.