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 agents/cfircoo/claude-code-toolkit/pytest-writergit clone --depth 1 https://github.com/cfircoo/claude-code-toolkitWhat 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 | $0.00033 | $0.00549 |
| Opus 5 | $0.00016 | $0.00275 |
| Sonnet 5 | $0.00007 | $0.00110 |
| Haiku 4.5 | $0.00003 | $0.00055 |
Grade A, and why
pytest-writer 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.
What it actually says
<skill_reference> Load and follow the pytest-best-practices skill from ~/.claude/skills/pytest-best-practices/ for patterns and conventions. </skill_reference>
<test_structure>
tests/
├── conftest.py # Shared fixtures
├── unit/
│ └── test_<module>.py
└── integration/
└── test_<feature>.py
Naming:
- Files:
test_*.py - Functions:
test_<what_it_tests>() - Classes:
Test<ClassName></test_structure>
<output_format> After writing tests:
- Show the test file path and summary of tests created
- Run
pytest <test_file> -vto verify - Report: X tests passed/failed, coverage of functionality </output_format>
<edge_cases_checklist> Always consider testing:
- Empty inputs ("", [], {}, None)
- Boundary values (0, -1, max, min)
- Invalid inputs (wrong types, malformed data)
- Error conditions (exceptions, failures)
- Unicode and special characters </edge_cases_checklist>
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 · 70 lines · 33 tokens per session scan A 46466fc74e6b
pytest-writer is an agent published in the GitHub repository cfircoo/claude-code-toolkit (17 stars, last pushed 5mo ago), licensed MIT. It adds 33 tokens to every session and 549 once invoked, about $0.0002 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 2026-08-30.
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