old-python-code-review

A single-pass review workflow for Python code. It checks correctness, security, style, project rules, active plans, related code, and tests when those materials exist.

In plain words
What is it for?
Use it when you want an on-demand review of a Python change. It is meant for one reviewer’s pass, while a multi-reviewer audit uses a different workflow.
Why use it?
Python changes can conflict with repository conventions or requirements even when the code appears to work. This review orders findings by severity and calls out uncertainty or straightforward fixes.

Skill for Claude CodeCodex

Install

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.

agentmods
npx agentmods add skills/vosslab/vosslab-skills/old-python-code-review
Any agent
npx skills add vosslab/vosslab-skills --skill old-python-code-review
Clone the repo
git clone --depth 1 https://github.com/vosslab/vosslab-skills

Made for: Claude Code, Codex.

Per session 35 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 688 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce 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

Measured yesterday against content hash c151fd6ae0e3, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

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.

skills/quality/old-python-code-review/SKILL.md · 58 lines

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

  1. Apply repo-rules-reader to the requested repo rule files. For the default review baseline, read AGENTS.md, docs/REPO_STYLE.md, docs/PYTHON_STYLE.md, docs/PYTEST_STYLE.md when present, and docs/CHANGELOG.md.
  2. Extract the review-relevant rules, especially how to run Python, Python style, pytest style, repo workflow rules, and the latest changelog entry.
  3. Inspect changed files first (git diff, git status --short), then inspect related call sites.
  4. If the repo has docs/active_plans/, identify the active plan document(s) that govern the change. Otherwise, skip plan-conformance steps.
  5. If an active plan exists, map code and tests to plan requirements, acceptance criteria, and stated constraints. Otherwise, skip this step.
  6. Prioritize findings by severity: plan mismatch/regressions when applicable, correctness/safety, then maintainability.
  7. Provide concrete, minimal fixes with before/after examples when a fix is straightforward.
  8. 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 (P1 critical, P2 high, P3 medium, P4 low)
    • File path and line reference
    • Risk and likely impact
    • Recommended change
  • 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.md when 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_path for 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.

Read the full file on GitHub · 58 lines

Files

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.

Changes

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.

  1. yesterday First seen · 58 lines · 35 tokens per session scan A c151fd6ae0e3

Subscribe to this mod's changes

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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