Code Review

Repository Code Review

Perform a comprehensive code quality review of an entire repository, analyzing architecture, security, performance, and testing practices. This is for reviewing a whole codebase — for PR-level reviews, use the code-review-skill instead.

Instructions

1. Repository Analysis

• Read CLAUDE.md, README.md, and CONTRIBUTING.md for project context and conventions.
• Examine the repository structure and identify the primary language/framework.
• Check configuration files (package.json, requirements.txt, Cargo.toml, go.mod, etc.) to understand the tech stack.
• Identify the project's build system, test framework, and linting setup.

2. Code Quality Assessment

• Scan for code smells, anti-patterns, and potential bugs across the codebase.
• Check for consistent coding style and naming conventions.
• Identify unused imports, variables, dead code, or abandoned files.
• Review error handling and logging practices — are errors caught and handled consistently?
• Run the project's linter if available and report violations.

3. Security Review

• Check for hardcoded secrets, API keys, or passwords. Flag as CRITICAL if found.
• Look for common vulnerabilities: SQL injection, XSS, command injection, path traversal.
• Review authentication and authorization logic for correctness.
• Examine input validation and sanitization at system boundaries.
• Check for insecure dependencies (npm audit, pip audit, or equivalent).

4. Performance Analysis

• Identify potential performance bottlenecks (inefficient algorithms, N+1 queries, missing indexes).
• Review memory usage patterns and potential leaks.
• Check for unnecessary synchronous blocking, missing caching, or excessive network calls.
• Analyze bundle size and dependency weight where applicable.

5. Architecture & Design

• Evaluate code organization and separation of concerns.
• Check for proper abstraction and modularity — are responsibilities cleanly divided?
• Review dependency management and coupling between modules.
• Assess scalability: will the current architecture support growth?
• Identify architectural debt and areas needing refactoring.

6. Testing Coverage

• Assess existing test coverage: what percentage of critical paths are tested?
• Evaluate test quality — are tests testing behavior or just implementation details?
• Identify areas lacking proper testing (error paths, edge cases, integration points).
• Review test structure and organization for maintainability.

7. Documentation Review

• Evaluate code comments and inline documentation — are complex sections explained?
• Check API documentation completeness.
• Review README accuracy: are setup instructions current and correct?
• Identify undocumented public APIs, configuration options, or architectural decisions.

8. Findings and Recommendations

Structure the output as follows:

Summary

2-3 sentences on overall codebase health and maturity.

Findings

Organize by severity:

CRITICAL — Security vulnerabilities, exposed secrets, data loss risks. Must address immediately.

HIGH — Significant bugs, architectural issues, missing error handling. Should address soon.

MEDIUM — Code quality issues, missing tests, design improvements. Address in normal workflow.

LOW — Style inconsistencies, minor optimizations, documentation gaps. Address opportunistically.

For each finding, include:

• Location — File path(s) and line numbers where applicable
• Issue — Clear description of the problem
• Impact — Why it matters and what could go wrong
• Recommendation — Specific, actionable fix with code example if helpful

Strengths

Call out what the codebase does well — good patterns, clean modules, thorough tests.

Priority Actions

A ranked list of the top 5-10 improvements that would have the highest impact on codebase quality.