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/madebyaris/rakitui-ai/python-developmentgit clone --depth 1 https://github.com/madebyaris/rakitui-aiWhat 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 | $0.03606 |
| Opus 5 | $0.00000 | $0.01803 |
| Sonnet 5 | $0.00000 | $0.00721 |
| Haiku 4.5 | $0.00000 | $0.00361 |
Grade A, and why
python-development 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 2d 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 — 644 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Python Development Patterns
Modern Python (3.10+) best practices for web development, data science, and general programming.
CRITICAL: Agentic-First Python Development
Pre-Development Verification (MANDATORY)
Before writing ANY Python code:
1. CHECK PYTHON INSTALLATION
→ run_terminal_cmd("python3 --version")
→ run_terminal_cmd("pip --version")
→ run_terminal_cmd("uv --version") # Modern package manager
2. VERIFY CURRENT VERSIONS (use web_search)
→ web_search("Python stable version December 2024")
→ web_search("FastAPI latest version 2024")
→ web_search("Django LTS version 2024")
3. CHECK EXISTING PROJECT
→ Does pyproject.toml/requirements.txt exist? Read it first!
→ Is there a virtual environment?
→ What dependencies are already installed?
4. VIRTUAL ENVIRONMENT (ALWAYS USE)
→ run_terminal_cmd("python3 -m venv .venv")
→ run_terminal_cmd("source .venv/bin/activate")
CLI-First Python Development
ALWAYS use CLI for package management:
# Virtual environment (ALWAYS create first)
python3 -m venv .venv
source .venv/bin/activate # Unix
.venv\Scripts\activate # Windows
# Modern: uv (10-100x faster than pip)
uv venv
uv pip install fastapi uvicorn
uv pip sync requirements.txt
# Traditional: pip
pip install fastapi uvicorn
pip install -r requirements.txt
pip freeze > requirements.txt
# Framework CLIs (use these for scaffolding)
# Django
django-admin startproject myproject
python manage.py startapp myapp
# FastAPI with cookiecutter
pip install cookiecutter
cookiecutter https://github.com/tiangolo/full-stack-fastapi-template
# Poetry (if project uses it)
poetry init
poetry add fastapi
poetry install
Post-Edit Verification
After ANY Python code changes:
# Type checking
mypy src/
# Linting
ruff check .
ruff format --check .
# Or older tools
flake8 .
black --check .
# Tests
pytest
pytest --cov=src
# Verify imports work
python -c "import mypackage"
Common Python Syntax Traps (Avoid These!)
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.
- 2d ago First seen · 644 lines · 0 tokens per session scan A 6f607b95f0b3
python-development is a cursor rule published in the GitHub repository madebyaris/rakitui-ai (5 stars, last pushed 7mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 3,606 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 2026-08-31.
Other cursor rules, from other repositories
AIRules
NexusLink MCP four-step workflow and prohibitions (copy to project .cursor/rules/ and fill the project-specific section).
002-verify-before-act
Requires Claude to read before writing, verify before installing, and confirm before destructive operations.
cursorrules
Read and follow CLAUDE.md in the repository root before making any changes. It contains all agent rules for this project.
801-python-environment
Cursor rule "801-python-environment" from savagelysubtle/BIG-BRAIN-Memory-Bank, covering first, activate the virtual environment, then use uv to install packages, bad: installing directly without environment activation and bad: using pip instead of uv.
angular-20
This rule provides comprehensive best practices and coding standards for Angular development, focusing on modern TypeScript, standalone components, signals, and performance optimizations.
dev-standard
Apache Superset development standards and guidelines for Cursor IDE.