code-review

A thorough code review guide focused on simplifying structure, improving type safety, checking compiler correctness, and finding accessibility, localization, resource, and concurrency problems.

In plain words
What is it for?
Use it for senior-level reviews of code changes, including checks for unnecessary complexity, weak type contracts, resource leaks, inaccessible interfaces, translation problems, and concurrency bugs.
Why use it?
It helps catch long-term maintenance risks and correctness issues that a quick review may miss.

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/jackfranklin/dotfiles/code-review
Any agent
npx skills add jackfranklin/dotfiles --skill code-review
Clone the repo
git clone --depth 1 https://github.com/jackfranklin/dotfiles

Made for: Claude Code, Codex.

Per session 61 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,714 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 $0.00061 $0.01714
Opus 5 $0.00030 $0.00857
Sonnet 5 $0.00012 $0.00343
Haiku 4.5 $0.00006 $0.00171

Measured 2d ago against content hash 3d9448eec1c1, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

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 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.

claude/skills/code-review/SKILL.md · 95 lines

How it starts

The opening of the file, as written. The whole thing — 95 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Code Review

Harsh, expert code review focused on implementation quality, aggressive simplification, and long-term maintainability. Be ambitious. Do not merely identify local cleanup opportunities; actively search for "code judo" moves that make the implementation dramatically simpler and more elegant.

Core Principles

  1. Code Judo: Actively look for restructurings that delete complexity rather than rearranging it. Reframe the problem so branches, helpers, or layers disappear entirely.
  2. Zero Spaghetti: Ban ad-hoc conditionals and scattered special cases in unrelated flows. Push logic into dedicated abstractions or state machines.
  3. Direct & Boring: Prefer explicit, legible code over hacky, magical, or thin abstractions that add indirection without value.
  4. Strict Boundaries: Enforce clean type contracts. Flag unnecessary optionality, any, unknown, or excessive casting. Banish as any unless explicitly permitted.
  5. Canonical Home: Put logic in the correct layer and reuse existing utilities instead of building bespoke ones.

Workflow

  1. Context: Read the commit message (if any) and identify staged/unstaged changes. When diffing against a base branch, use git diff <base>...HEAD (three-dot range) rather than git diff $(git merge-base <base> HEAD) HEAD — the three-dot form avoids a subshell so it matches the Bash permission allowlist without extra prompts.
  2. Scope: Review each changed file statically (do not build or run tests). Inspect the diff and read unchanged files (signatures, constants, types) to understand the full impact.
  3. Apply Checklists: For each file, evaluate changes against the checklists below.
  4. Report: Synthesize observations into a single cohesive report, grouped by impact (critical bugs, architectural, minor).

Review Checklist

Do not approve merely because the code works. Apply the following checks:

1. Code Smells Baseline (Fowler Refactoring, Ch. 3)

Review the diff against this checklist of common smells. Each smell is a judgment call, never a hard violation. A documented repository standard overrides this baseline.

Read the full file on GitHub · 95 lines

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. 2d ago First seen · 95 lines · 61 tokens per session scan A 3d9448eec1c1

Subscribe to this mod's changes

code-review is a skill published in the GitHub repository jackfranklin/dotfiles (254 stars, last pushed 9d ago), licensed MIT. It adds 61 tokens to every session and 1,714 once invoked, about $0.0003 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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