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/bobmatnyc/claude-mpm/toolchains-python-testing-pytestnpx skills add bobmatnyc/claude-mpm --skill toolchains-python-testing-pytestgit clone --depth 1 https://github.com/bobmatnyc/claude-mpmWrote 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/bobmatnyc/claude-mpm/toolchains-python-testing-pytest)<a href="https://agentmods.dev/skills/bobmatnyc/claude-mpm/toolchains-python-testing-pytest"><img src="https://agentmods.dev/badge/skills/bobmatnyc/claude-mpm/toolchains-python-testing-pytest.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 | $0.00028 | $0.08143 |
| Opus 5 | $0.00014 | $0.04071 |
| Sonnet 5 | $0.00006 | $0.01629 |
| Haiku 4.5 | $0.00003 | $0.00814 |
Grade A, and why
pytest scanned grade A with 1 finding 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 today.
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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
response = requests.get(f"https://api.example.com/users/{user_id}") The source is not reproduced here
No licence file
A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.
What ships with it
2 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.
- today First seen · 1,444 lines · 28 tokens per session scan A 64ac7cd1d6c1
pytest is a skill published in the GitHub repository bobmatnyc/claude-mpm (149 stars, last pushed 3d ago), with no licence file. It adds 28 tokens to every session and 8,143 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
Other skills, from other repositories
pytest
Skill "pytest" from bobmatnyc/claude-mpm-skills, covering pytest - professional python testing, basic pytest, with common plugins, for fastapi testing and for django testing.
pytest
Advanced Python unit testing framework for customer support tech enablement, covering FastAPI, SQLAlchemy, PostgreSQL, async operations, mocking, fixtures, parametrization, coverage, and comprehensive testing strategies for backend support systems.
pytest-testing
Write maintainable pytest suites — fixtures and scopes, parametrize, tmppath, monkeypatch, coverage, and a CI-friendly layout.
python
Use when building FastAPI applications, implementing async endpoints, setting up Pydantic schemas, working with SQLAlchemy, or writing pytest tests for Python backend services.
mypy
Skill "mypy" from bobmatnyc/claude-mpm-skills, covering mypy - static type checking for python, basic mypy, with common type stubs, for fastapi projects and for django projects.
testing-anti-patterns
Never test mock behavior. Never add test-only methods to production classes. Understand dependencies before mocking. Language-agnostic principles with TypeScript/Jest and Python/pytest examples.