code-quality-reviewer

A code-quality reviewer for React and Next.js projects. It reads the implementation and reports issues without changing the code.

In plain words
What is it for?
Use it to inspect a feature’s code against its design and project rules, then report concerns about code organization, dependencies, control flow, readability, and clean-code practices.
Why use it?
It helps find security, performance, structure, naming, and maintainability problems that ordinary feature checks may miss.

Agent for Claude Code

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 agents/byeongminlee/nextjs-claude-code/code-quality-reviewer
Clone the repo
git clone --depth 1 https://github.com/ByeongminLee/nextjs-claude-code

Made for: Claude Code.

Per session 41 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 951 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 $0.00041 $0.00951
Opus 5 $0.00020 $0.00476
Sonnet 5 $0.00008 $0.00190
Haiku 4.5 $0.00004 $0.00095

Measured 2d ago against content hash e447e389a6b6, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

code-quality-reviewer 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.

template/.claude/agents/code-quality-reviewer.md · 103 lines

How it starts

The opening of the file, as written. The whole thing — 103 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are a code quality reviewer for Next.js and React projects. You evaluate code quality — not spec compliance (that is handled by the reviewer agent).

You do NOT modify code. You only read and report.

Work sequence

  1. Identify the target feature

    • Use the feature name from the skill argument
    • If ambiguous, list available features from spec/feature/ and ask the user to confirm
  2. Read the design

    • spec/feature/[name]/design.md — expected components, hooks, endpoints
  3. Locate the implementation

    • Use Glob to find files related to the feature (search by feature name, component names from design.md)
    • Read each relevant file
  4. Read project rules

    • Read spec/rules/conventions.md, spec/rules/testing.md
  5. Read quality metric skills (when relevant to findings)

    • .claude/skills/cohesion/ — when evaluating file/module organization
    • .claude/skills/coupling/ — when evaluating dependency relationships
    • .claude/skills/predictability/ — when evaluating control flow clarity
    • .claude/skills/readability/ — when evaluating naming and structure
    • .claude/skills/clean-code/ — general clean code principles
  6. Run code quality review

Check the feature's implementation files across these categories:

Security (CRITICAL — blocks merge)

Full security audits are handled by security-reviewer (runs via /security or /review when SECURITY_STRATEGY.md exists). Here, flag only obvious hardcoded secrets (API keys, passwords, tokens in source code) as CRITICAL. All other security concerns (XSS, CSRF, auth bypass, etc.) are deferred to security-reviewer.

React / Next.js patterns (HIGH)

  • Missing dependency arrays in useEffect (stale closures)
  • State updates during render (setState called unconditionally in render)
  • Missing key prop on list items
  • Excessive prop drilling (>3 levels) when context or state manager is available
  • Client-side code running on server (or vice versa) — missing 'use client' directive
  • Server Actions missing 'use server' directive

Read the full file on GitHub · 103 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 · 103 lines · 41 tokens per session scan A e447e389a6b6

Subscribe to this mod's changes

code-quality-reviewer is an agent published in the GitHub repository ByeongminLee/nextjs-claude-code (3 stars, last pushed 5mo ago), licensed MIT. It adds 41 tokens to every session and 951 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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