Agent skill

Code Reviewer

by criptogus in criptogus/agent-evolve-network

Reviews a code diff and returns prioritized, actionable feedback grouped by severity.

CC-BY-SA-4.0Auto-check passedDevelopment

Install Code Reviewer

skills CLI

$ npx skills add criptogus/agent-evolve-network --skill code-reviewer -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install criptogus/agent-evolve-network code-reviewer --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/criptogus/agent-evolve-network.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/code-reviewer .claude/skills/code-reviewer && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Paste into Claude Code

Install the "code-reviewer" agent skill from https://github.com/criptogus/agent-evolve-network/tree/main/skills/code-reviewer into .claude/skills/code-reviewer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "code-reviewer", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/criptogus/agent-evolve-network/tree/main/skills/code-reviewer

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add criptogus/agent-evolve-network --skill code-reviewer -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install criptogus/agent-evolve-network code-reviewer --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/criptogus/agent-evolve-network.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/code-reviewer .agents/skills/code-reviewer && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "code-reviewer" agent skill from https://github.com/criptogus/agent-evolve-network/tree/main/skills/code-reviewer into .agents/skills/code-reviewer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "code-reviewer", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add criptogus/agent-evolve-network --skill code-reviewer -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install criptogus/agent-evolve-network code-reviewer --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/criptogus/agent-evolve-network.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/code-reviewer .cursor/skills/code-reviewer && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "code-reviewer" agent skill from https://github.com/criptogus/agent-evolve-network/tree/main/skills/code-reviewer into .cursor/skills/code-reviewer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "code-reviewer", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/criptogus/agent-evolve-network.git --path skills/code-reviewer

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add criptogus/agent-evolve-network --skill code-reviewer -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install criptogus/agent-evolve-network code-reviewer --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/criptogus/agent-evolve-network.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/code-reviewer .gemini/skills/code-reviewer && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "code-reviewer" agent skill from https://github.com/criptogus/agent-evolve-network/tree/main/skills/code-reviewer into .gemini/skills/code-reviewer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "code-reviewer", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install criptogus/agent-evolve-network code-reviewer

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add criptogus/agent-evolve-network --skill code-reviewer -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/criptogus/agent-evolve-network.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/code-reviewer .github/skills/code-reviewer && rm -rf skills-src

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "code-reviewer" agent skill from https://github.com/criptogus/agent-evolve-network/tree/main/skills/code-reviewer into .github/skills/code-reviewer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "code-reviewer", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add criptogus/agent-evolve-network --skill code-reviewer -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install criptogus/agent-evolve-network code-reviewer --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/criptogus/agent-evolve-network.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/code-reviewer .opencode/skills/code-reviewer && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "code-reviewer" agent skill from https://github.com/criptogus/agent-evolve-network/tree/main/skills/code-reviewer into .opencode/skills/code-reviewer/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "code-reviewer", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: code-reviewer
GitHub stars: 288
Token cost: ~820 tokens
SKILL.md length: 204 words
Files: 1
Skills in repo: 107
Repo updated: Sep 9, 2026
First seen: Oct 7, 2026
Licence: CC-BY-SA-4.0

At a glance

Reviews a code diff and returns prioritized, actionable feedback grouped by severity.

Works in 3 steps: Blocking (correctness/security) → Should fix (perf/maintainability) → Nits (style/naming)
The user asks for pragmatic code reviewer work
SKILL.md covers Instructions, Always, Never and Input / output contract, plus 6 more sections
Reaches superagentskill.com

What it does

Code Reviewer is an agent skill from criptogus/agent-evolve-network. Reviews a code diff and returns prioritized, actionable feedback grouped by severity. Use when the user asks for pragmatic code reviewer work, or mentions code, reviewer.

Its SKILL.md is about 820 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Development, covering Code review. The licence is CC-BY-SA-4.0.

When your agent uses it

The user asks for pragmatic code reviewer work
Tasks that involve Code review

Example prompts

“Use the code-reviewer skill to review a code diff and returns prioritized, actionable feedback grouped by severity”
“/code-reviewer”

Requirements

Node.js

Workflow steps

3 steps, taken from the first numbered list in SKILL.md.

Blocking (correctness/security)
Should fix (perf/maintainability)
Nits (style/naming)

What it can do on your machine

Read from SKILL.md and the folder at commit d19b920. It shows what the files ask for, not the result of running them.

Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md (its code samples are json and typescript).
From the folder's file list and the shell code blocks in SKILL.md.
Network
Hosts in commands or code, which the agent is likely to contact:
- superagentskill.com
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Code Reviewer loads about 820 tokens when it runs. Until then it costs about 46 tokens; SKILL.md has 204 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~46
When it runs · the whole SKILL.md, loaded when a task matches: ~820

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from criptogus/agent-evolve-network at commit d19b920, republished under its CC-BY-SA-4.0 licence (© criptogus). 204 words, ~820 tokens.

Download SKILL.mdSave it as .claude/skills/code-reviewer/SKILL.md (or your agent's skills folder).

name: code-reviewer
description: Reviews a code diff and returns prioritized, actionable feedback grouped by severity. Use when the user asks for pragmatic code reviewer work, or mentions code, reviewer.
version: 0.1.0
license: CC-BY-SA-4.0
homepage: https://superagentskill.com/marketplace/code-reviewer
source: Super Agent Skill (SAK)

Pragmatic Code Reviewer

Use this skill when you have a unified diff (git format) and want a focused review. It flags correctness, security, performance and readability issues, and suggests concrete rewrites. It does NOT run the code or guess at intent beyond what the diff shows.

Instructions

You are a senior engineer doing a pull-request review. You receive a unified diff. Produce feedback grouped under exactly these headings, in this order:

Blocking (correctness/security)
Should fix (perf/maintainability)
Nits (style/naming) For every item, include: file:line, the problem in one sentence, and a suggested patch in a fenced code block. If a section has no items, write "None". Never invent code that is not in the diff. Never lecture about general best practices.

Always

Reference exact file:line from the diff for every comment.
Keep each comment under 4 sentences.
Use the three fixed sections.

Never

Suggest changes outside the diff.
Repeat the same issue across sections.
Praise the author or add filler.

Input / output contract

Input:

json

{
  "type": "object",
  "properties": {
    "diff": {
      "type": "string",
      "description": "unified diff"
    },
    "context": {
      "type": "string",
      "description": "optional PR description"
    }
  },
  "required": [
    "diff"
  ]
}

Output:

json

{
  "type": "object",
  "properties": {
    "markdown": {
      "type": "string"
    }
  },
  "required": [
    "markdown"
  ]
}

Examples

Off-by-one in a loop

Input:

diff --git a/util.ts b/util.ts
@@ -3,5 +3,5 @@ export function lastN<T>(arr: T[], n: number) {
-  return arr.slice(arr.length - n);
+  return arr.slice(arr.length - n - 1);
 }

Expected output:

## Blocking
- **util.ts:5** — Off-by-one: `arr.length - n - 1` returns `n + 1` items.
  ```ts
  return arr.slice(arr.length - n);

Should fix

None

Nits

None


Why: One clear blocking issue, exact line cited, suggested patch included.

### Clean diff, only nit

Input:

diff --git a/api.ts b/api.ts @@ -10,2 +10,2 @@ -const URL='https://api.example.com' +const apiURL = 'https://api.example.com'


Expected output:

Blocking

None

Should fix

None

Nits

api.ts:11 — Prefer API_URL (SCREAMING_SNAKE_CASE) for module-level constants.
ts
```
const API_URL = 'https://api.example.com';
```


## Trust & telemetry

This skill is graded on the Super Agent Skill network: format, substance and adversarial
(prompt-injection) testing produce a public Trust Score.

- Trust Score & evidence: https://superagentskill.com/marketplace/trust/code-reviewer
- Skill page: https://superagentskill.com/marketplace/code-reviewer
- Live version (always current) via MCP: https://superagentskill.com/api/mcp

Reinstall or update with `npx skills update`, or pull the live graded version with
`npx super-agent install code-reviewer`.

Files

Just SKILL.md in skills/code-reviewer of criptogus/agent-evolve-network.

Open the folder on GitHubat commit d19b920

Compare with similar skills

Code Reviewer next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Code Reviewer compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Code Reviewer this skillcriptogus/agent-evolve-network	288	—	~820	Automated safety check: Pass	CC-BY-SA-4.0	27 days ago
PR Babysitteropeninterpreter/openinterpreter	69k	3 repos	~4.2k	Automated safety check: Pass	Apache-2.0	today
Code Review ChecklistshareAI-lab/learn-claude-code	78k	5 repos	~1.1k	Automated safety check: Pass	MIT	9 days ago
Backend Code Reviewlangflow-ai/langflow	156k	—	~3.5k	Automated safety check: Notes	MIT	today
Understand Diff AnalysisEgonex-AI/Understand-Anything	85k	1 repos	~1.4k	Automated safety check: Pass	MIT	yesterday
Mole Bug Patternstw93/Mole	69k	—	~2k	Automated safety check: Pass	GPL-3.0	today

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Questions about Code Reviewer

What does Code Reviewer do?

Reviews a code diff and returns prioritized, actionable feedback grouped by severity. Code Reviewer is an agent skill from criptogus/agent-evolve-network. Reviews a code diff and returns prioritized, actionable feedback grouped by severity.

When should I use Code Reviewer?

Code Reviewer fits situations like: the user asks for pragmatic code reviewer work; tasks that involve Code review.

How do I install Code Reviewer in Claude Code?

Run `npx skills add criptogus/agent-evolve-network --skill code-reviewer -a claude-code`. Or copy the skill folder (skills/code-reviewer in criptogus/agent-evolve-network) into .claude/skills/code-reviewer in your project. Claude Code loads it when a task matches its description.

How do I install Code Reviewer in Codex?

Run `npx skills add criptogus/agent-evolve-network --skill code-reviewer -a codex`. Or copy the skill folder (skills/code-reviewer in criptogus/agent-evolve-network) into .agents/skills/code-reviewer in your project. Codex loads it when a task matches its description.

Can I use Code Reviewer in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add criptogus/agent-evolve-network --skill code-reviewer -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/code-reviewer, .gemini/skills/code-reviewer, .github/skills/code-reviewer and .opencode/skills/code-reviewer in your project.

What does Code Reviewer need to run?

SKILL.md names no scripts, command-line tools or credentials: Code Reviewer is instructions for the agent only. Our summary lists: Node.js.

Does Code Reviewer access the network?

SKILL.md names 1 domain. In commands or code: superagentskill.com; the agent is likely to contact it when it follows the instructions. This is read from the text; nothing was executed.

Is Code Reviewer safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Code Reviewer use?

Code Reviewer is published under the CC-BY-SA-4.0 licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Code Reviewer use?

About 820 tokens (SKILL.md is roughly 3.3k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Code Reviewer?

Skills that share tags, products or a category with Code Reviewer: PR Babysitter (openinterpreter/openinterpreter, 69k stars), Code Review Checklist (shareAI-lab/learn-claude-code, 78k stars), Backend Code Review (langflow-ai/langflow, 156k stars) and Understand Diff Analysis (Egonex-AI/Understand-Anything, 85k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Code Reviewer?

criptogus (a GitHub user) maintains it in criptogus/agent-evolve-network, which has 288 GitHub stars. The repository holds 107 skills in this directory. The repository was last updated on September 9, 2026.

Source: criptogus/agent-evolve-network on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Code Reviewer

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Pragmatic Code Reviewer

Instructions

Always

Never

Input / output contract

Examples

Off-by-one in a loop

Should fix

Nits

Blocking

Should fix

Nits

Files

Compare with similar skills

Similar skills

More from criptogus/agent-evolve-network

Related

Questions about Code Reviewer