A code-review skill for examining software for bugs, security risks, performance problems, unclear structure, naming issues, and missing tests.

It helps review code changes, identify issues by severity, and suggest improvements to correctness, security, performance, maintainability, and test coverage.

It gives developers a systematic review of possible problems and asks for concrete fixes tied to files and line numbers.

code-review — Skill for Claude Code and Codex by lwmxiaobei/xbcode

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 lwmxiaobei/xbcode --skill code-review

Clone the repo

git clone --depth 1 https://github.com/lwmxiaobei/xbcode

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/lwmxiaobei/xbcode/code-review/github.svg)](https://agentmods.dev/skills/lwmxiaobei/xbcode/code-review)

Your own site

<a href="https://agentmods.dev/skills/lwmxiaobei/xbcode/code-review"><img src="https://agentmods.dev/badge/skills/lwmxiaobei/xbcode/code-review/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/lwmxiaobei/xbcode/code-review"><img src="https://agentmods.dev/badge/skills/lwmxiaobei/xbcode/code-review.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 13 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 222 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.

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.

Model	Per session	Once invoked
Fable 5.1	$0.00013	$0.00222
Opus 5.5	$0.00005	$0.00089
Sonnet 5.5	$0.00003	$0.00044
Haiku 4.5	$0.00001	$0.00022

Measured 2mo ago against content hash 84731261b5cd, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, 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 2mo 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-review/SKILL.md · 23 lines

What it actually says

Code Review Guidelines

When reviewing code, follow these steps:

Read the code thoroughly — understand the intent before critiquing.
Check for bugs — null references, off-by-one errors, race conditions, resource leaks.
Evaluate naming — are variables, functions, and classes named clearly?
Assess structure — is the code modular? Are responsibilities well-separated?
Security — look for injection vulnerabilities, unsafe inputs, hardcoded secrets.
Performance — unnecessary allocations, N+1 queries, blocking calls in async code.
Tests — are edge cases covered? Are tests readable and maintainable?

Output format:

Start with a one-line summary (good / needs work / has issues).
List findings grouped by severity: 🔴 Critical, 🟡 Warning, 🟢 Suggestion.
For each finding, include file, line, and a concrete fix.

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.

2mo ago First seen · 23 lines · 13 tokens per session scan A 84731261b5cd

Subscribe to this mod's changes

code-review is a skill published in the GitHub repository lwmxiaobei/xbcode (48 stars, last pushed 2mo ago), licensed MIT. It adds 13 tokens to every session and 222 once invoked, about $0.0001 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 2026-08-30.

Code review development

code-review next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
code-reviewlwmxiaobei/xbcode	Skill	48	2mo ago	MIT	A	13	Claude Code, Codex
code-reviewgithub/spec-kit	Skill	148k	yesterday	MIT	A	54	Claude Code
code-quality-principlesathola/claude-night-market	Skill	348	yesterday	MIT	A	38	Claude Code
octocode-roastbgauryy/octocode	Skill	957	2d ago	MIT	A	71	Claude Code, Codex
code-review-webrampstackco/claude-skills	Skill	1.0k	11d ago	MIT	A	121	Claude Code
code-reviewfabriqaai/specs.md	Skill	225	3d ago	MIT	A	30	Claude Code, Codex
brooks-lintskillmds/skillmd	Skill	189	3d ago	MIT	A	26	Claude Code