Critical Code Review

Critical Code Review

Perform context-aware critical code review with integrated fix execution.

Review Targets

• Specific file: src/​main.ts
• Branch diff: main..feature/​new-api
• Recent commit: HEAD~1..HEAD
• Directory: src/
• PR: #123
• No argument: diff between current branch and base (main/​master/​develop)

Target Resolution

1. If argument provided: use as review target
2. If no argument:
   • Get current branch: git branch --show-current
   • Find base branch (priority: main, master, develop)
   • Review diff: git diff <base>...HEAD
   • Include unstaged changes

Review Context (Determine First)

• Project phase: MVP/​Development/​Production/​Refactoring
• Priority: Performance/​Maintainability/​Extensibility
• Tech stack: Languages/​Frameworks/​Paradigms
• File type: Backend/​Frontend/​UI Component/​Database/​Infrastructure

Review Criteria

🔴 High Priority (Critical)

1. Security risks: SQL/​XSS injection, auth flaws, secret exposure
2. Data corruption: Transaction failures, race conditions, improper locking
3. System failure: Unhandled exceptions, resource leaks, infinite loops

🟡 Medium Priority (Design Quality)

1. Type safety & Domain Modeling: Primitive obsession, invalid state representation, missing smart constructors
2. Functional programming violations: Side effects, missing Result types, mutability
3. Design principle deviations: SOLID violations, high coupling, low cohesion
4. Domain model inconsistencies: Misrepresented business rules, ambiguous boundaries
5. Maintainability issues: Untestable design, missing documentation, implicit assumptions

🟢 Low Priority (Improvements)

1. Efficiency: N+1 queries, unnecessary computation, cache opportunities
2. Code quality: Duplication, naming, readability

🎨 UI/​Frontend Specific

1. UI state management: Invalid state combinations, missing loading/​error states
2. Accessibility: Missing ARIA, keyboard navigation, color-dependent information
3. Responsive design: Hardcoded sizes, mobile support, breakpoint inconsistencies
4. Component boundaries: Props drilling, excessive responsibility
5. UI performance: Unnecessary re-renders, heavy components, missing virtualization

Review Process

• Perform self review and Codex review in parallel when feasible to reduce latency.

1. Self review: Perform critical review based on criteria above
2. Codex review (required when tool available): Request review via mcp__codex-cli__codex tool with context. If unavailable, explicitly note it.
3. Integrate results: Combine self review and Codex review into final issue list
4. Present results: Output in the format below only after Codex review is completed or confirmed unavailable

Heuristic Review Guidance

• Understand context, intent, and constraints before judging
• Imagine the code's evolution over the next year
• Use domain knowledge to validate business logic
• Look beyond the listed categories and report issues of equivalent severity

Output Format

### 🔴/🟡/🟢 [Criterion Name]
**Issue**:
- Location (file:line)
- Detailed description

**Impact**:
- Technical: Bug/​Performance degradation/​Maintainability
- Business: User experience/​Development velocity/​Cost

**Fix**:
```[language]
// Specific fix code
```

Output Constraints

• Issue count: Max 5 by priority (guideline: 🔴2, 🟡2, 🟢1). If critical issues are numerous, adjust upward while keeping prioritization.
• Specificity: Include file:line, provide code examples
• Conciseness: Consider CLI display, be clear
• Practicality: Provide realistic, implementable fixes

Post-Review Fix Flow

After presenting review results, display:

## 🔧 Fix Options

Execute fixes? (y/​n/​select)
- y: Execute all
- n: Exit without fixing
- select: Choose items to fix

Selection:

Fix Item Organization

## 🔧 Planned Fixes

### Auto-fix Items (🔴 Critical)
1. [Issue name] - file:line
   - Issue: [Brief description]
   - Fix: [What will be changed]

### Items Requiring Confirmation (🟡 Design / 🔵 Other)
2. [Issue name] - file:line
   - Issue: [Brief description]
   - Proposed fix: [Suggestion]
   - Impact scope: [Other file impacts]

### Skip Items (🟢 Suggestions)
3. [Issue name] - file:line (Manual fix recommended)

Ensure every item is numbered so the user can select them easily.

Item Selection (when select)

Enter item numbers to fix (comma-separated):
Example: 1,2,4

Fix Execution

Fix Validation Criteria

• Impact scope: Trace dependencies and identify side effects
• Correctness: Ensure expected behavior is preserved
• Testability: Ensure the fix can be verified by tests
• Mathematical verification (when algorithms change): Check complexity, concurrency safety, and invariants

Pre-fix Verification

• Confirm current file state
• Verify fix code fits context
• Consider impacts on other parts

Fix Application

• Minimal changes: Only changes needed to solve the issue
• Maintain consistency: Preserve existing code style, naming, indentation
• Check imports: Add new dependencies appropriately
• Type consistency: Ensure type integrity
• Backward compatibility: Clarify impact when behavior/​API changes
• Naming conventions: Follow existing project rules
• Avoid magic numbers: Prefer named constants with intent
• Comments for complexity: Add concise comments only when needed

Quality Check

• Syntax errors: Ensure no syntax errors after fix
• Logical consistency: Ensure fix doesn't introduce new issues
• Edge cases: Ensure proper boundary and error handling
• Performance impact: Ensure no performance degradation

Test Implementation/​Update

• Check existing tests: Identify tests related to fix location
• Update tests: Update tests that fail due to fix
• Add new tests: Add regression tests for bug fixes, cover normal/​error cases for new features
• Test-first when feasible: Prefer writing a failing test before applying the fix

Fix Report

## ✅ Fix Complete Report

### Successful Fixes
- ✅ [Issue name] - file:line
  - Changes: [Actual changes made]

### Failed Fixes
- ❌ [Issue name] - file:line
  - Error: [Failure reason]
  - Workaround: [Manual fix instructions]

### Next Steps
1. **Run tests (Required)**: Verify all tests pass
2. Run lint/​format if defined
3. Run type checks if applicable
4. Provide manual test steps for uncovered flows
5. Confirm changes with `git diff`
6. Check test coverage report
7. Restore with `git checkout -- <file>` if needed

Error Handling

• Do not apply fixes that fail
• Partial success is acceptable; report clearly what was applied
• Report all errors with actionable guidance

Codex Review Integration

When mcp__codex-cli__codex tool is available, request secondary review:

Perform critical code review on the following code changes.
Focus on: security risks, data integrity, design quality, and maintainability.
Provide specific issues with file:line locations and fix suggestions.

[Include code diff or file content]

If the tool is unavailable but the Codex CLI is available, use:

codex exec -m gpt-codex-5.2 -c reasoning_effort=xhigh "Perform critical code review on the following code changes. [Include diff or file content]"

Integrate Codex findings with self review, removing duplicates and prioritizing by severity.