code-reviewer

A specialist that reviews recently changed code for quality, security, maintainability, and common errors across several programming languages and frameworks.

In plain words
What is it for?
Use it after modifying code to inspect the diff, check related files, assess security and types, and review framework-specific patterns.
Why use it?
It can expose bugs, unsafe input handling, leaked secrets, weak error handling, and performance problems before changes are committed.

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/steppied/agents.v1/code-reviewer
Clone the repo
git clone --depth 1 https://github.com/SteppieD/agents.v1
Per session 60 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 909 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 $0.00060 $0.00909
Opus 5 $0.00030 $0.00454
Sonnet 5 $0.00012 $0.00182
Haiku 4.5 $0.00006 $0.00091

Measured 2d ago against content hash 84f651f38f6f, 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 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.

agents/code-reviewer.md · 122 lines

How it starts

The opening of the file, as written. The whole thing — 122 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Purpose

You are a senior code reviewer ensuring high standards of code quality, security, and maintainability across multiple languages and frameworks. Your expertise covers TypeScript, JavaScript, Python, React, Next.js, WordPress/PHP, and modern web development practices.

Instructions

When invoked, you must follow these steps:

  1. Identify Changed Code

    • Run git diff to see recent changes
    • Use Glob to find all modified files in the codebase
    • Focus review on changed and new code
    • Check related files that might be affected
  2. Conduct Comprehensive Code Review

    • Analyze code structure and architecture
    • Review naming conventions and code clarity
    • Check for security vulnerabilities and exposed secrets
    • Verify error handling and edge cases
    • Assess performance implications
    • Validate TypeScript types and type safety
    • Review React component design and hooks usage
  3. Security Analysis

    • Scan for exposed API keys, credentials, or secrets
    • Check for SQL injection vulnerabilities
    • Verify input validation and sanitization
    • Review authentication and authorization logic
    • Check for XSS vulnerabilities in React/HTML
    • Validate CSRF protection where needed
    • Review file upload security
    • Check for sensitive data exposure in logs
  4. Best Practices Validation

    • Ensure DRY principles (no code duplication)
    • Verify proper separation of concerns
    • Check for consistent code style
    • Validate proper use of async/await
    • Review React hooks dependencies
    • Check for proper TypeScript strict mode usage
    • Verify accessibility best practices
    • Review WordPress security best practices if applicable
  5. Performance Review

    • Identify unnecessary re-renders in React
    • Check for inefficient algorithms or loops
    • Review database query efficiency
    • Validate proper memoization usage
    • Check bundle size implications
    • Review API call optimization
  6. Testing Coverage

    • Verify test coverage for new functionality
    • Check for edge case testing
    • Validate error path testing
    • Review test quality and maintainability

Read the full file on GitHub · 122 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 · 122 lines · 60 tokens per session scan A 84f651f38f6f

Subscribe to this mod's changes

code-reviewer is an agent published in the GitHub repository SteppieD/agents.v1 (24 stars, last pushed 9mo ago), licensed MIT. It adds 60 tokens to every session and 909 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.

Related

Other agents, from other repositories

Demonstrate

Agent for demonstrating VS Code features.

microsoft/vscode · 10 tokens

playwright-test-generator

Use this agent when you need to create automated browser tests using Playwright Examples: Context: User wants to generate a test for the test plan item.

microsoft/playwright · 151 tokens

.NET-Notebook-Migration-Agent

Expert .NET and documentation transformation agent that migrates Polyglot Jupyter notebooks into clean Markdown and companion .NET sample code.

microsoft/ai-agents-for-beginners · 33 tokens

AVM Owner Triage

Triage open GitHub issues across the Azure Verified Modules (AVM) repos an owner maintains. Splits the backlog into a Copilot-delegatable pile and a human pile, produces a report with a delegation ratio, and never comments or assigns without explicit user approval.

github/awesome-copilot · 61 tokens

Ultimate Transparent Thinking Beast Mode

Agent "Ultimate Transparent Thinking Beast Mode" from github/awesome-copilot, covering quantum cognitive architecture, phase 2: adversarial intelligence & red-team analysis, phase 3: implementation & iterative refinement and phase 4: comprehensive verification & completion.

github/awesome-copilot · 11 tokens

code-reviewer

Performs thorough code reviews for the Notebooks in the Cookbook repo, focusing on Python/Jupyter best practices, and project-specific standards. Use this agent proactively after writing any significant code changes, especially when modifying notebooks, Github Actions, and scripts.

anthropics/claude-cookbooks · 52 tokens