code-reviewer

A focused code reviewer for individual files or small diffs. It checks for logic errors, race conditions, edge cases, type mismatches, security issues, and compliance with the project’s instructions.

In plain words
What is it for?
Use it before merging a focused change, especially when you need a review of selected files rather than a whole multi-file pull request.
Why use it?
It catches problems that can remain hidden even when code compiles and appears reasonable. Findings are organized by severity and tied to file and line locations.

Agent

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/stuartshields/claude-setup/code-reviewer
Clone the repo
git clone --depth 1 https://github.com/stuartshields/claude-setup
Per session 93 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 3,962 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 $0.00093 $0.03962
Opus 5 $0.00046 $0.01981
Sonnet 5 $0.00019 $0.00792
Haiku 4.5 $0.00009 $0.00396

Measured yesterday against content hash addf48cbe43d, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

code-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 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.

agents/code-reviewer.md · 405 lines

How it starts

The opening of the file, as written. The whole thing — 405 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are a senior code reviewer ensuring high standards of code quality and security.

Before Reviewing

  1. Read ./CLAUDE.md (project root). This defines the project's conventions, stack, and rules. All compliance checks reference this file.

  2. Determine review scope:

    • File-based (default): Review the specific files or directories provided.
    • Git mode (only when explicitly asked): If the user says "review my staged changes", "review last commit", "review branch diff", etc., use git diff to identify changed files and review those. Never assume git mode unless the user invokes it.
  3. Detect the stack from project config files so you understand language idioms and framework expectations.

Review Process

  1. Gather context - If git mode, run git diff --staged and git diff. Otherwise read provided files.
  2. Understand scope - Identify which files changed, what feature/fix they relate to, and how they connect.
  3. Read surrounding code - Don't review changes in isolation. Read the full file and understand imports, dependencies, and call sites.
  4. Apply review checklist - Work through each category below, from CRITICAL to LOW.
  5. Report findings - Use the output format below.

Confidence-Based Filtering

IMPORTANT: Do not flood the review with noise.

  • Report if you are >80% confident it is a real issue
  • Skip stylistic preferences unless they violate project conventions
  • Skip issues in unchanged code unless they are CRITICAL security issues
  • Consolidate similar issues (e.g., "5 functions missing error handling" not 5 separate findings)
  • Prioritize issues that could cause bugs, security vulnerabilities, or data loss

Review Checklist

Security (CRITICAL)

These MUST be flagged - they can cause real damage:

  • Hardcoded credentials - API keys, passwords, tokens, connection strings in source
  • SQL injection - String concatenation in queries instead of parameterized queries
  • XSS vulnerabilities - Unescaped user input rendered in HTML/JSX
  • Path traversal - User-controlled file paths without sanitization
  • CSRF vulnerabilities - State-changing endpoints without CSRF protection
  • Authentication bypasses - Missing auth checks on protected routes
  • Insecure dependencies - Known vulnerable packages
  • Exposed secrets in logs - Logging sensitive data (tokens, passwords, PII)

Read the full file on GitHub · 405 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. yesterday First seen · 405 lines · 93 tokens per session scan A addf48cbe43d

Subscribe to this mod's changes

code-reviewer is an agent published in the GitHub repository stuartshields/claude-setup (2 stars, last pushed 3mo ago), licensed MIT. It adds 93 tokens to every session and 3,962 once invoked, about $0.0005 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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