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Correctness Review

Category: Security  ·  Sub-category: security-misc  ·  Last updated:
type:review
A focused single-lens code review that hunts correctness bugs only — logic errors, off-by-one, inverted conditions, broken invariants, wrong state transitions, null/None/nil mishandling, and the unhandled branch the author never ran. For each suspected bug it hand-traces (and reproduces where it can) before asserting, then reports it with file:line, severity, why-it-matters, and a concrete fix. Run it alone for a sharp pass, or compose it with security/performance/etc. — it deliberately does not duplicate grill's exhaustive all-lens sweep.
Security AStatic scan found no risk patternsHow grading works ›

From the source SKILL.md

You are a specialist with one lens: is this code correct? Not "is it secure", not "is it fast", not "is it pretty" — does it compute the right answer on every input, hold its invariants, and take the branch it's supposed to. Your job is to find the bug — the logic that's wrong, the case that was never run, the condition that's inverted, the state that transitions where it shouldn't.

What this skill does

Correctness Review is a community-contributed Claude Code skill in the security-misc sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/correctness-review/ and loads when your prompt matches the skill's trigger.

Who uses this skill

The Correctness Review Claude Code skill is built for security engineers, penetration testers, DevSecOps practitioners, and development teams hardening codebases and infrastructure. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 174,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/correctness-review
curl -L https://claudskills.com/skills/correctness-review/SKILL.md \
  -o ~/.claude/skills/correctness-review/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/correctness-review/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/correctness-review/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\correctness-review\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Telegram

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Correctness Review Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/correctness-review/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.
What does the Correctness Review skill do?
A focused single-lens code review that hunts correctness bugs only — logic errors, off-by-one, inverted conditions, broken invariants, wrong state transitions, null/None/nil mishandling, and the unhandled branch the author never ran. For each suspected bug it hand-traces (and reproduces where it can) before asserting, then reports it with file:line, severity, why-it-matters, and a concrete fix. Run it alone for a sharp pass, or compose it with security/performance/etc. — it deliberately does not duplicate grill's exhaustive all-lens sweep.
Is this skill free to install?
Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.
When should I use the Correctness Review skill?
Use Correctness Review when your Claude Code task falls under the Security category — specifically in the security misc area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Correctness Review" or describe the task and let Claude pick). Browse related skills at /category/security/.
What is a Claude Code skill and how does the Correctness Review skill fit in?
A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Correctness Review is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Security category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA
itzikiusa. (2026). Correctness Review [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/correctness-review/
BibTeX
@misc{correctness-review-2026,
  author    = {itzikiusa},
  title     = {Correctness Review [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/correctness-review/}
}

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Security scan

Grade A · scanned 2026-08-02 — free static scan against the OWASP Agentic Skills Top 10.

No risk patterns were found in any of the ten OWASP-aligned categories. How grading works ›

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Browse all Security skills in the ClaudSkills registry, or explore these other picks from the same category:

Browse all Security skills → Top 100 skills
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