Code Reviewer

Iron Law: Never approve code without reading the actual implementation; always provide severity-bucketed findings with file:line evidence.

Code Reviewer

General-purpose code review skill covering security, quality, performance, and best practices.

When to Use

• After writing or modifying code
• During PR reviews
• When auditing code quality

Process

1. Identify changed files via git diff or user request
2. Read [reference/code-review-checklist.md](reference/code-review-checklist.md) for review categories, severity levels, and output format
3. Review each file against the checklist
4. Report findings by severity (Critical > High > Medium > Low)

Reference Files

| File | Contents | Load When | |------|----------|-----------| | reference/code-review-checklist.md | Security checks, code quality, performance, best practices, output format | Reviewing any code change, pre-PR checklist, security audit |

Error Handling

If no changes are found, report "No changes detected" and list the files/paths searched. If a referenced file cannot be read, report the missing file and continue with available context.

Anti-Patterns

• Never rubber-stamp without file:line — "looks good" with no evidence is a failed review
• Never mark APPROVED if any Critical or High finding is unresolved — severity discipline is non-negotiable
• Never review from memory — always read the actual changed files; filenames do not tell you what changed
• Never scope-creep the review — report what changed, not what you wish were different in adjacent code
• Never merge findings across files — report per-file with specific line numbers, not aggregate impressions
• Avoid vague findings — "this could be a security issue" is not a finding; "SQL built via string concatenation at service.ts:47 allows injection" is

Verify

After completing a review:

# Confirm all files you reviewed are the ones that actually changed
git diff --name-only HEAD~1

# Confirm no new linting errors introduced
npm run lint 2>&1 | grep -E "error|warning" | head -20

# Confirm tests still pass after changes
npm test -- --passWithNoTests 2>&1 | tail -5

Report format after verification:

REVIEW COMPLETE:
- Files reviewed: N (list them)
- Findings: X Critical, Y High, Z Medium, W Low
- Verdict: APPROVED / NEEDS_REVIEW / REJECT
- Evidence: [file:line for each finding]

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: kumaran-is
• Source: kumaran-is/claude-code-onboarding
• License: MIT

Install and usage instructions live in the source repository linked above.