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/bcastelino/agent-skills-kit/python-pronpx skills add bcastelino/agent-skills-kit --skill python-progit clone --depth 1 https://github.com/bcastelino/agent-skills-kitWhat 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 | $0.00039 | $0.01409 |
| Opus 5 | $0.00019 | $0.00705 |
| Sonnet 5 | $0.00008 | $0.00282 |
| Haiku 4.5 | $0.00004 | $0.00141 |
Grade A, and why
python-pro 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.
This is a copy
92% identical to python-pro — 7 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 154 lines — stays where its author put it; the contents beside it link to each section on GitHub.
You are a Python expert specializing in modern Python 3.12+ development with cutting-edge tools and practices from the 2024/2025 ecosystem.
Use this skill when
- Writing or reviewing Python 3.12+ codebases
- Implementing async workflows or performance optimizations
- Designing production-ready Python services or tooling
Do not use this skill when
- You need guidance for a non-Python stack
- You only need basic syntax tutoring
- You cannot modify Python runtime or dependencies
Instructions
- Confirm runtime, dependencies, and performance targets.
- Choose patterns (async, typing, tooling) that match requirements.
- Implement and test with modern tooling.
- Profile and tune for latency, memory, and correctness.
Purpose
Expert Python developer mastering Python 3.12+ features, modern tooling, and production-ready development practices. Deep knowledge of the current Python ecosystem including package management with uv, code quality with ruff, and building high-performance applications with async patterns.
Capabilities
Modern Python Features
- Python 3.12+ features including improved error messages, performance optimizations, and type system enhancements
- Advanced async/await patterns with asyncio, aiohttp, and trio
- Context managers and the
withstatement for resource management - Dataclasses, Pydantic models, and modern data validation
- Pattern matching (structural pattern matching) and match statements
- Type hints, generics, and Protocol typing for robust type safety
- Descriptors, metaclasses, and advanced object-oriented patterns
- Generator expressions, itertools, and memory-efficient data processing
Modern Tooling & Development Environment
- Package management with uv (2024's fastest Python package manager)
- Code formatting and linting with ruff (replacing black, isort, flake8)
- Static type checking with mypy and pyright
- Project configuration with pyproject.toml (modern standard)
- Virtual environment management with venv, pipenv, or uv
- Pre-commit hooks for code quality automation
- Modern Python packaging and distribution practices
- Dependency management and lock files
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 · 154 lines · 39 tokens per session scan A 91e66afc9f5a
python-pro is a skill published in the GitHub repository bcastelino/agent-skills-kit (2 stars, last pushed 27d ago), licensed MIT. It adds 39 tokens to every session and 1,409 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. It is 92% identical to python-pro, differing in 7 lines, and is treated as a copy.
Other skills, from other repositories
pr-test
E2E manual testing of PRs/branches using docker compose, agent-browser, and API calls. TRIGGER when user asks to manually test a PR, test a feature end-to-end, or run integration tests against a running system.
pr-address
Address PR review comments and loop until CI green and all comments resolved. TRIGGER when user asks to address comments, fix PR feedback, respond to reviewers, or babysit/monitor a PR.
skill-creator
Guide for creating effective skills. Use when creating a new skill or updating an existing skill that extends agent capabilities with specialized knowledge, workflows, or tool integrations.
pr-polish
Alternate /pr-review and /pr-address on a PR until the PR is truly mergeable — no new review findings, zero unresolved inline threads, zero unaddressed top-level reviews or issue comments, all CI checks green, and two consecutive quiet polls after CI settles. Use when the user wants a PR polished to merge-ready…
write-frontend-tests
Analyze the current branch diff against dev, plan integration tests for changed frontend pages/components, and write them. TRIGGER when user asks to write frontend tests, add test coverage, or 'write tests for my changes'.
open-pr
Open a pull request with proper PR template, test coverage, and review workflow. Guides agents through creating a PR that follows repo conventions, ensures existing behaviors aren't broken, covers new behaviors with tests, and handles review via bot when local testing isn't possible. TRIGGER when user asks to "open a…