Claude Code For Code Review: The Security-Review Skill

The official security-review skill ships with Claude Code. Used right, it's a real second pair of eyes; used wrong, it's noise. Knowing the difference is the skill.

9 min · Reviewed 2026

What security-review actually does

The security-review skill walks the changed files in a session and checks for common security mistakes: input validation gaps, authentication flaws, hardcoded secrets, unsafe deserialization, SQL injection patterns, broken access control. It produces a structured report with severity ratings. It does not replace a security audit — it's a fast first pass.

What it's good at

Catching the obvious — secrets in code, missing input validation, unparameterized queries
Flagging changed code paths, not the whole repo (limits noise)
Producing structured output you can act on (severity + location + suggested fix)
Speed — runs in seconds on small diffs, not the hours a manual review takes
Consistency — the same diff produces similar findings each run, unlike one-off human reviews

What it misses

Business logic flaws: 'this auth check is correct, but it lives in the wrong place'
Cross-component vulnerabilities that span files it didn't read
Anything that requires understanding the runtime environment
Race conditions, timing attacks, side-channel issues
Anything subtle enough that human security engineers debate it

Tuning the noise

If you see	Tune by
Same false positive on every run	Add an exception in CLAUDE.md or the skill body
Findings on autogenerated code	Exclude generated paths
Review fatigue across team	Cut to high-severity only for non-prod work
Real bugs being skipped	Tighten or expand scope; check skill version

Apply: weave it into your workflow

Run security-review on the next non-trivial PR you write
Triage every finding: act, defer with note, or false-positive
After three runs, tune CLAUDE.md to silence the chronic false positives
For real high-stakes code: still get a human security review on top

The big idea: the security-review skill is a useful second pair of eyes for the obvious mistakes. It is not a replacement for human security review on real-stakes code.

From the communityOn r/ClaudeAI, security engineers who have audited the most-installed third-party 'security review' skills warn that many are static checklists redistributed without value-add — the official `claude-code-security-review` GitHub Action and the bundled `/security-review` slash command are what most teams actually run. Researchers have demonstrated prompt-injection vulnerabilities where a maliciously crafted PR title can hijack a security-review action — the community fix is to scope review-bot permissions to read-only on PRs from forks and to never let security-review write changes itself. Power users on X also flag the false-positive trap: settings.API_URL flagged as SSRF without the skill checking whether the value is a server constant or user input. Tune CLAUDE.md to silence the chronic noise so real findings stay visible.

End-of-lesson check

15 questions · take it digitally for instant feedback at tendril.neural-forge.io/learn/quiz/end-claude-code-security-review-creators

What is the core idea behind "Claude Code For Code Review: The Security-Review Skill"?
1. The official security-review skill ships with Claude Code. Used right, it's a real second pair of eyes; used wrong, it's noise. Knowing the difference is the skill.
2. Try one of the others for a single project; note what's better and worse
3. Any commands it expects to run
4. Edit tool
Which term best describes a foundational idea in "Claude Code For Code Review: The Security-Review Skill"?
1. diff scope
2. security review
3. false positive
4. defense in depth
A learner studying Claude Code For Code Review: The Security-Review Skill would need to understand which concept?
1. security review
2. false positive
3. diff scope
4. defense in depth
Which of these is directly relevant to Claude Code For Code Review: The Security-Review Skill?
1. security review
2. diff scope
3. defense in depth
4. false positive
Which of the following is a key point about Claude Code For Code Review: The Security-Review Skill?
1. Catching the obvious — secrets in code, missing input validation, unparameterized queries
2. Flagging changed code paths, not the whole repo (limits noise)
3. Producing structured output you can act on (severity + location + suggested fix)
4. Speed — runs in seconds on small diffs, not the hours a manual review takes
Which of these does NOT belong in a discussion of Claude Code For Code Review: The Security-Review Skill?
1. Catching the obvious — secrets in code, missing input validation, unparameterized queries
2. Try one of the others for a single project; note what's better and worse
3. Flagging changed code paths, not the whole repo (limits noise)
4. Producing structured output you can act on (severity + location + suggested fix)
Which statement is accurate regarding Claude Code For Code Review: The Security-Review Skill?
1. Cross-component vulnerabilities that span files it didn't read
2. Anything that requires understanding the runtime environment
3. Business logic flaws: 'this auth check is correct, but it lives in the wrong place'
4. Race conditions, timing attacks, side-channel issues
Which of these does NOT belong in a discussion of Claude Code For Code Review: The Security-Review Skill?
1. Try one of the others for a single project; note what's better and worse
2. Anything that requires understanding the runtime environment
3. Cross-component vulnerabilities that span files it didn't read
4. Business logic flaws: 'this auth check is correct, but it lives in the wrong place'
What is the key insight about "Diff-scoped, not repo-scoped" in the context of Claude Code For Code Review: The Security-Review Skill?
1. The skill works best when scoped to the changes, not the whole codebase.
2. Try one of the others for a single project; note what's better and worse
3. Any commands it expects to run
4. Edit tool
What is the key insight about "Don't ship on a green report" in the context of Claude Code For Code Review: The Security-Review Skill?
1. Try one of the others for a single project; note what's better and worse
2. A clean security-review skill report does not mean the code is secure — only that it didn't trip the skill's checks.
3. Any commands it expects to run
4. Edit tool
What is the key insight about "From the community" in the context of Claude Code For Code Review: The Security-Review Skill?
1. Try one of the others for a single project; note what's better and worse
2. Any commands it expects to run
3. On r/ClaudeAI, security engineers who have audited the most-installed third-party 'security review' skills warn that man…
4. Edit tool
Which statement accurately describes an aspect of Claude Code For Code Review: The Security-Review Skill?
1. Try one of the others for a single project; note what's better and worse
2. Any commands it expects to run
3. Edit tool
4. The security-review skill walks the changed files in a session and checks for common security mistakes: input validation gaps, authenticatio…
What does working with Claude Code For Code Review: The Security-Review Skill typically involve?
1. The big idea: the security-review skill is a useful second pair of eyes for the obvious mistakes.
2. Try one of the others for a single project; note what's better and worse
3. Any commands it expects to run
4. Edit tool
Which best describes the scope of "Claude Code For Code Review: The Security-Review Skill"?
1. It is unrelated to tools workflows
2. It focuses on The official security-review skill ships with Claude Code. Used right, it's a real second pair of ey
3. It applies only to the opposite beginner tier
4. It was deprecated in 2024 and no longer relevant
Which section heading best belongs in a lesson about Claude Code For Code Review: The Security-Review Skill?
1. Try one of the others for a single project; note what's better and worse
2. Any commands it expects to run
3. What it's good at
4. Edit tool

← Back to interactive lesson

Tendril · Creators · Tools Literacy

Claude Code For Code Review: The Security-Review Skill

The official security-review skill ships with Claude Code. Used right, it's a real second pair of eyes; used wrong, it's noise. Knowing the difference is the skill.

9 min · Reviewed 2026

What security-review actually does

What it's good at

Catching the obvious — secrets in code, missing input validation, unparameterized queries
Flagging changed code paths, not the whole repo (limits noise)
Producing structured output you can act on (severity + location + suggested fix)
Speed — runs in seconds on small diffs, not the hours a manual review takes
Consistency — the same diff produces similar findings each run, unlike one-off human reviews

What it misses

Business logic flaws: 'this auth check is correct, but it lives in the wrong place'
Cross-component vulnerabilities that span files it didn't read
Anything that requires understanding the runtime environment
Race conditions, timing attacks, side-channel issues
Anything subtle enough that human security engineers debate it

Tuning the noise

If you see	Tune by
Same false positive on every run	Add an exception in CLAUDE.md or the skill body
Findings on autogenerated code	Exclude generated paths
Review fatigue across team	Cut to high-severity only for non-prod work
Real bugs being skipped	Tighten or expand scope; check skill version

Apply: weave it into your workflow

Run security-review on the next non-trivial PR you write
Triage every finding: act, defer with note, or false-positive
After three runs, tune CLAUDE.md to silence the chronic false positives
For real high-stakes code: still get a human security review on top

The big idea: the security-review skill is a useful second pair of eyes for the obvious mistakes. It is not a replacement for human security review on real-stakes code.

End-of-lesson check

15 questions · take it digitally for instant feedback at tendril.neural-forge.io/learn/quiz/end-claude-code-security-review-creators

What is the core idea behind "Claude Code For Code Review: The Security-Review Skill"?
1. The official security-review skill ships with Claude Code. Used right, it's a real second pair of eyes; used wrong, it's noise. Knowing the difference is the skill.
2. Try one of the others for a single project; note what's better and worse
3. Any commands it expects to run
4. Edit tool
Which term best describes a foundational idea in "Claude Code For Code Review: The Security-Review Skill"?
1. diff scope
2. security review
3. false positive
4. defense in depth
A learner studying Claude Code For Code Review: The Security-Review Skill would need to understand which concept?
1. security review
2. false positive
3. diff scope
4. defense in depth
Which of these is directly relevant to Claude Code For Code Review: The Security-Review Skill?
1. security review
2. diff scope
3. defense in depth
4. false positive
Which of the following is a key point about Claude Code For Code Review: The Security-Review Skill?
1. Catching the obvious — secrets in code, missing input validation, unparameterized queries
2. Flagging changed code paths, not the whole repo (limits noise)
3. Producing structured output you can act on (severity + location + suggested fix)
4. Speed — runs in seconds on small diffs, not the hours a manual review takes
Which of these does NOT belong in a discussion of Claude Code For Code Review: The Security-Review Skill?
1. Catching the obvious — secrets in code, missing input validation, unparameterized queries
2. Try one of the others for a single project; note what's better and worse
3. Flagging changed code paths, not the whole repo (limits noise)
4. Producing structured output you can act on (severity + location + suggested fix)
Which statement is accurate regarding Claude Code For Code Review: The Security-Review Skill?
1. Cross-component vulnerabilities that span files it didn't read
2. Anything that requires understanding the runtime environment
3. Business logic flaws: 'this auth check is correct, but it lives in the wrong place'
4. Race conditions, timing attacks, side-channel issues
Which of these does NOT belong in a discussion of Claude Code For Code Review: The Security-Review Skill?
1. Try one of the others for a single project; note what's better and worse
2. Anything that requires understanding the runtime environment
3. Cross-component vulnerabilities that span files it didn't read
4. Business logic flaws: 'this auth check is correct, but it lives in the wrong place'
What is the key insight about "Diff-scoped, not repo-scoped" in the context of Claude Code For Code Review: The Security-Review Skill?
1. The skill works best when scoped to the changes, not the whole codebase.
2. Try one of the others for a single project; note what's better and worse
3. Any commands it expects to run
4. Edit tool
What is the key insight about "Don't ship on a green report" in the context of Claude Code For Code Review: The Security-Review Skill?
1. Try one of the others for a single project; note what's better and worse
2. A clean security-review skill report does not mean the code is secure — only that it didn't trip the skill's checks.
3. Any commands it expects to run
4. Edit tool
What is the key insight about "From the community" in the context of Claude Code For Code Review: The Security-Review Skill?
1. Try one of the others for a single project; note what's better and worse
2. Any commands it expects to run
3. On r/ClaudeAI, security engineers who have audited the most-installed third-party 'security review' skills warn that man…
4. Edit tool
Which statement accurately describes an aspect of Claude Code For Code Review: The Security-Review Skill?
1. Try one of the others for a single project; note what's better and worse
2. Any commands it expects to run
3. Edit tool
4. The security-review skill walks the changed files in a session and checks for common security mistakes: input validation gaps, authenticatio…
What does working with Claude Code For Code Review: The Security-Review Skill typically involve?
1. The big idea: the security-review skill is a useful second pair of eyes for the obvious mistakes.
2. Try one of the others for a single project; note what's better and worse
3. Any commands it expects to run
4. Edit tool
Which best describes the scope of "Claude Code For Code Review: The Security-Review Skill"?
1. It is unrelated to tools workflows
2. It focuses on The official security-review skill ships with Claude Code. Used right, it's a real second pair of ey
3. It applies only to the opposite beginner tier
4. It was deprecated in 2024 and no longer relevant
Which section heading best belongs in a lesson about Claude Code For Code Review: The Security-Review Skill?
1. Try one of the others for a single project; note what's better and worse
2. Any commands it expects to run
3. What it's good at
4. Edit tool

← Back to interactive lesson