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/vosslab/vosslab-skills/old-python-code-reviewnpx skills add vosslab/vosslab-skills --skill old-python-code-reviewgit clone --depth 1 https://github.com/vosslab/vosslab-skillsWhat 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 | $0.00035 | $0.00688 |
| Opus 5 | $0.00017 | $0.00344 |
| Sonnet 5 | $0.00007 | $0.00138 |
| Haiku 4.5 | $0.00003 | $0.00069 |
Grade A, and why
old-python-code-review 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 — 58 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Old Python Code Review
Workflow
- Apply
repo-rules-readerto the requested repo rule files. For the default review baseline, readAGENTS.md,docs/REPO_STYLE.md,docs/PYTHON_STYLE.md,docs/PYTEST_STYLE.mdwhen present, anddocs/CHANGELOG.md. - Extract the review-relevant rules, especially how to run Python, Python style, pytest style, repo workflow rules, and the latest changelog entry.
- Inspect changed files first (
git diff,git status --short), then inspect related call sites. - If the repo has
docs/active_plans/, identify the active plan document(s) that govern the change. Otherwise, skip plan-conformance steps. - If an active plan exists, map code and tests to plan requirements, acceptance criteria, and stated constraints. Otherwise, skip this step.
- Prioritize findings by severity: plan mismatch/regressions when applicable, correctness/safety, then maintainability.
- Provide concrete, minimal fixes with before/after examples when a fix is straightforward.
- Flag uncertainty explicitly and ask targeted review questions for unclear logic or contracts.
Review Output Contract
- Report findings first, ordered by severity.
- For each finding include:
- Severity (
P1critical,P2high,P3medium,P4low) - File path and line reference
- Risk and likely impact
- Recommended change
- Severity (
- After findings, include:
- Open questions
- Test gaps and residual risk
- Brief summary
What To Check
- Prefer design-level fixes over symptom patches; cite
docs/REPO_STYLE.mdwhen flagging this. - Plan conformance: implementation and tests match active plan scope, ordering, and acceptance criteria.
- Plan drift: behavior changed without corresponding plan/changelog updates, or plan claims complete while code is partial.
- Correctness: edge cases, off-by-one logic, stale assumptions, API misuse, compatibility breaks.
- Security: unsafe eval/exec, command injection, path traversal, deserialization hazards, and weak validation.
- Maintainability: dead code, hidden coupling, unclear naming, duplicated logic, brittle tests.
- Python style: tabs for indentation, import module names rather than imported symbols when
practical, no relative imports, direct required-key access, minimal try/except, shebangs only on
runnable scripts, and
source source_me.sh && python ...command examples. - Pytest style: small deterministic tests, plain asserts, stable behavior-focused expectations,
tmp_pathfor filesystem tests, and no assertions on dates, collection sizes, required key lists, hardcoded defaults, function names, or other fragile details. - Performance only when materially relevant.
What ships with it
1 file 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.
- yesterday First seen · 58 lines · 35 tokens per session scan A c151fd6ae0e3
old-python-code-review is a skill published in the GitHub repository vosslab/vosslab-skills (2 stars, last pushed 6d ago), licensed MIT. It adds 35 tokens to every session and 688 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 2026-08-31.
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