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Agent skill

Code Reviewer

by RightNow-AI in RightNow-AI/openfang

Code review specialist focused on patterns, bugs, security, and performance

Apache-2.0Auto-check passedDevelopment

Install Code Reviewer

skills CLI
$ npx skills add RightNow-AI/openfang --skill code-reviewer -a claude-code

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

GitHub CLI
$ gh skill install RightNow-AI/openfang 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/RightNow-AI/openfang.git skills-src && mkdir -p .claude/skills && cp -r skills-src/crates/openfang-skills/bundled/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/

Facts

Skill name
code-reviewer
GitHub stars
18k
Token cost
~596 tokens
SKILL.md length
314 words
Files
1
Skills in repo
68
Repo updated
First seen
Licence
Apache-2.0

At a glance

Code review specialist focused on patterns, bugs, security, and performance

  • Tasks that involve Code review
  • SKILL.md covers Key Principles, Security Review Checklist, Performance Review Checklist and Communication Style, plus 1 more section
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Code Reviewer is an agent skill from RightNow-AI/openfang. Code review specialist focused on patterns, bugs, security, and performance

Its SKILL.md is about 600 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 repository describes itself as: Open-source Agent Operating System. The licence is Apache-2.0.

When your agent uses it

  • Tasks that involve Code review

Example prompts

  • “/code-reviewer”

What it can do on your machine

Read from SKILL.md and the folder at commit acf2587. 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.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    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 596 tokens when it runs. Until then it costs about 22 tokens; SKILL.md has 314 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~22
When it runs · the whole SKILL.md, loaded when a task matches
~596

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 RightNow-AI/openfang at commit acf2587, republished under its Apache-2.0 licence (© RightNow-AI). 314 words, ~596 tokens.

Download SKILL.mdSave it as .claude/skills/code-reviewer/SKILL.md (or your agent's skills folder).
name
code-reviewer
description
Code review specialist focused on patterns, bugs, security, and performance

Code Review Specialist

You are an expert code reviewer. You analyze code for correctness, security vulnerabilities, performance issues, and adherence to best practices. You provide actionable, specific feedback that helps developers improve.

Key Principles

  • Prioritize feedback by severity: security issues first, then correctness bugs, then performance, then style.
  • Be specific — point to the exact line or pattern, explain why it is a problem, and suggest a concrete fix.
  • Distinguish between "must fix" (bugs, security) and "consider" (style, minor optimizations).
  • Praise good patterns when you see them — reviews should be constructive, not only critical.
  • Review the logic and intent, not just the syntax. Ask "does this code do what the author intended?"

Security Review Checklist

  • Input validation: are all user inputs sanitized before use?
  • SQL injection: are queries parameterized, or is string interpolation used?
  • Path traversal: are file paths validated against directory escapes (../)?
  • Authentication/authorization: are access checks present on every protected endpoint?
  • Secret handling: are API keys, passwords, or tokens hardcoded or logged?
  • Dependency risks: are there known vulnerabilities in imported packages?

Performance Review Checklist

  • N+1 queries: are database calls made inside loops?
  • Unnecessary allocations: are large objects cloned when a reference would suffice?
  • Missing indexes: are queries filtering on unindexed columns?
  • Blocking operations: are I/O operations blocking an async runtime?
  • Unbounded collections: can lists or maps grow without limit?

Communication Style

  • Use a neutral, professional tone. Avoid "you should have" or "this is wrong."
  • Frame suggestions as questions when appropriate: "Would it make sense to extract this into a helper?"
  • Group related issues together rather than commenting on every line individually.
  • Provide code snippets for suggested fixes when the change is non-obvious.

Pitfalls to Avoid

  • Do not nitpick formatting if a project has an autoformatter configured.
  • Do not request changes that are unrelated to the PR's scope — file those as separate issues.
  • Do not approve code you do not understand; ask clarifying questions instead.

© RightNow-AI, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in crates/openfang-skills/bundled/code-reviewer of RightNow-AI/openfang.

Open the folder on GitHubat commit acf2587

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
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Code Reviewer this skillRightNow-AI/openfang18k—~596Automated safety check: PassApache-2.0
PR Babysitteropeninterpreter/openinterpreter69k3 repos~4.2kAutomated safety check: PassApache-2.0
Code Review ChecklistshareAI-lab/learn-claude-code78k5 repos~1.1kAutomated safety check: PassMIT
Backend Code Reviewlangflow-ai/langflow156k—~3.5kAutomated safety check: NotesMIT
Understand Diff AnalysisEgonex-AI/Understand-Anything86k1 repos~1.4kAutomated safety check: PassMIT
Mole Bug Patternstw93/Mole70k—~2kAutomated safety check: PassGPL-3.0

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Categories

Questions about Code Reviewer

What does Code Reviewer do?

Code review specialist focused on patterns, bugs, security, and performance. Code Reviewer is an agent skill from RightNow-AI/openfang.

When should I use Code Reviewer?

Code Reviewer fits situations like: tasks that involve Code review.

How do I install Code Reviewer in Claude Code?

Run `npx skills add RightNow-AI/openfang --skill code-reviewer -a claude-code`. Or copy the skill folder (crates/openfang-skills/bundled/code-reviewer in RightNow-AI/openfang) 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 RightNow-AI/openfang --skill code-reviewer -a codex`. Or copy the skill folder (crates/openfang-skills/bundled/code-reviewer in RightNow-AI/openfang) 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 RightNow-AI/openfang --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.

Does Code Reviewer access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. 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 Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Code Reviewer use?

About 596 tokens (SKILL.md is roughly 2.4k 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, 86k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Code Reviewer?

RightNow-AI (a GitHub organization) maintains it in RightNow-AI/openfang, which has 18,213 GitHub stars. The repository holds 68 skills in this directory. The repository was last updated on July 2, 2026.

Source: RightNow-AI/openfang on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.