code-reviewer

code-reviewer is a skill for Claude Code, Codex from TerminalSkills/skills. It costs 61 tokens per session (1,957 once invoked), scanned A, original, Apache-2.0.

A guide for reviewing source code, file changes, or pull requests for bugs, security problems, performance issues, and maintainability concerns.

In plain words
What is it for?
Use it to review implementations and pull requests, check input validation and error handling, and look for issues such as SQL injection, exposed secrets, race conditions, and path traversal.
Why use it?
It gives structured, prioritised feedback instead of leaving reviewers to find problems inconsistently. It can also suggest specific fixes and account for surrounding code.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: positional $N argument.

Good fit Use it to review implementations and pull requests, check input validation and error handling, and look for issues such as SQL injection, exposed secrets, race conditions, and path traversal.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/terminalskills/skills/code-reviewer
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.

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

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for code-reviewer

README.md
[![agentmods](https://agentmods.dev/badge/skills/terminalskills/skills/code-reviewer/github.svg)](https://agentmods.dev/skills/terminalskills/skills/code-reviewer)
Your own site
<a href="https://agentmods.dev/skills/terminalskills/skills/code-reviewer"><img src="https://agentmods.dev/badge/skills/terminalskills/skills/code-reviewer/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for code-reviewer

Your own site · 80×15
<a href="https://agentmods.dev/skills/terminalskills/skills/code-reviewer"><img src="https://agentmods.dev/badge/skills/terminalskills/skills/code-reviewer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 61 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,957 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
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 5.1 $0.00061 $0.01957
Opus 5.5 $0.00024 $0.00783
Sonnet 5.5 $0.00012 $0.00391
Haiku 4.5 $0.00006 $0.00196

Measured 19d ago against content hash 7edbe9e8668e, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, 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 19d 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.

skills/code-reviewer/SKILL.md · 259 lines

How it starts

The opening of the file, as written. The whole thing — 259 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Code Reviewer

Overview

Perform structured code reviews that identify bugs, security issues, performance problems, and maintainability concerns. Provides prioritized, actionable feedback with specific fix suggestions.

Instructions

When a user asks you to review code, a file, a diff, or a pull request, follow this process:

Step 1: Understand the context

Before reviewing, determine:

  • What does this code do? (feature, bugfix, refactor)
  • What language and framework is it using?
  • Are there tests included?
  • Is this a full file or a diff/patch?

Read surrounding files if needed to understand the broader codebase context. Get the change itself with git diff main...HEAD (local branch) or gh pr diff 482 (pull request), and run the project's own linter and test command first so the review does not repeat what tooling already reports.

Step 2: Review using this checklist

Evaluate the code against each category in order of severity:

Correctness (Critical)

  • Logic errors, off-by-one mistakes, wrong conditions
  • Unhandled null/undefined/empty cases
  • Race conditions or concurrency issues
  • Incorrect error handling (swallowed exceptions, wrong error types)
  • Missing input validation

Security (Critical)

  • SQL injection, XSS, command injection
  • Hardcoded secrets, API keys, passwords
  • Improper authentication/authorization checks
  • Unsafe deserialization, path traversal
  • Missing rate limiting on public endpoints

Performance (High)

  • N+1 queries in database loops
  • Unnecessary re-renders in UI components
  • Missing indexes for frequent queries
  • Unbounded memory growth (loading entire datasets)
  • Blocking operations on the main thread

Reliability (High)

  • Missing error handling for external calls (network, file I/O)
  • No retry logic for transient failures
  • Missing timeouts on HTTP requests
  • Resource leaks (unclosed connections, file handles)

Readability (Medium)

  • Unclear variable or function names
  • Functions doing too many things (> 30 lines is a smell)
  • Deeply nested conditionals (> 3 levels)
  • Missing or misleading comments
  • Inconsistent naming conventions

Read the full file on GitHub · 259 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. 19d ago Changed · +4 lines 7edbe9e8668e
  2. 1mo ago First seen · 255 lines · 61 tokens per session scan A d0c7915377f5

Subscribe to this mod's changes

code-reviewer is a skill published in the GitHub repository TerminalSkills/skills (177 stars, last pushed today), licensed Apache-2.0. It adds 61 tokens to every session and 1,957 once invoked, about $0.0002 per session on Opus 5.5. 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 2026-09-05.

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