Code Review

Code Review Skill

Purpose: Enforce automated code reviews as a mandatory guardrail before every commit and deployment. Choose between Claude, OpenAI Codex, Google Gemini, or multiple engines for comprehensive analysis.

Sub-skills:

• adr-gate.md — Pre-review ADR and spec enforcement

Pre-Review: ADR Gate (Mandatory)

Before any review engine runs, the ADR gate executes automatically:

1. Classify — trivial changes (typos, deps, tests-only) skip the gate
2. Discover — scan docs/adr/, _project_specs/, iCPG ReasonNodes, git history for linked ADRs and specs
3. Enforce — if no ADRs found for non-trivial changes:

• Interactive (default): draft ADR from git history, ask user to confirm
• Unattended (CI): write as Status: proposed, proceed
• Strict: block review until ADR exists

1. Inject — feed discovered ADRs + specs into the review prompt as architectural context

ADR Compliance Review Dimension

Added to the standard 7 review categories:

See adr-gate.md for full protocol, reverse-engineering rules, and configuration.

Review Engine Choice

When running /code-review, users can choose their preferred review engine:

┌─────────────────────────────────────────────────────────────────┐
│  CODE REVIEW - Choose Your Engine                               │
├─────────────────────────────────────────────────────────────────┤
│                                                                 │
│  ○ Claude (default)                                             │
│    Built-in, no extra setup, full conversation context          │
│                                                                 │
│  ○ OpenAI Codex CLI                                             │
│    GPT-5.2-Codex specialized for code review, 88% detection     │
│    Requires: npm install -g @openai/codex                       │
│                                                                 │
│  ○ Google Gemini CLI                                            │
│    Gemini 2.5 Pro with 1M token context, free tier available    │
│    Requires: npm install -g @google/gemini-cli                  │
│                                                                 │
│  ○ Dual Engine (any two)                                        │
│    Run two engines, compare findings, catch more issues         │
│                                                                 │
│  ○ All Three (maximum coverage)                                 │
│    Run Claude + Codex + Gemini for critical/security code       │
│                                                                 │
└─────────────────────────────────────────────────────────────────┘

Engine Comparison

Set Default Engine

# ~/.claude/settings.toml or project CLAUDE.md
[code-review]
default_engine = "claude"  # Options: claude, codex, gemini, dual, all

Usage Examples

# Use default engine
/code-review

# Explicitly choose engine
/code-review --engine claude
/code-review --engine codex
/code-review --engine gemini

# Dual engine (pick any two)
/code-review --engine claude,codex
/code-review --engine claude,gemini
/code-review --engine codex,gemini

# All three engines
/code-review --engine all

# Quick shortcuts
/code-review              # Uses default
/code-review --codex      # Use Codex
/code-review --gemini     # Use Gemini
/code-review --all        # All three engines

Multi-Engine Output

When using multiple engines, findings are compared and deduplicated:

Dual Engine Example

┌─────────────────────────────────────────────────────────────────┐
│  CODE REVIEW RESULTS - DUAL ENGINE (Claude + Codex)             │
├─────────────────────────────────────────────────────────────────┤
│                                                                 │
│  ✅ AGREED (Found by both):                                     │
│  🔴 SQL injection in auth.ts:45                                 │
│  🟡 Missing error handling in api.ts:112                        │
│                                                                 │
│  🔷 CLAUDE ONLY:                                                │
│  🟠 Potential race condition in worker.ts:89                    │
│  🟢 Consider extracting helper function                         │
│                                                                 │
│  🔶 CODEX ONLY:                                                 │
│  🟠 Memory leak - unclosed stream in upload.ts:34               │
│  🟡 N+1 query pattern in orders.ts:156                          │
│                                                                 │
├─────────────────────────────────────────────────────────────────┤
│  SUMMARY                                                        │
│  Agreed: 2 | Claude only: 2 | Codex only: 2                     │
│  Critical: 1 | High: 2 | Medium: 2 | Low: 1                     │
│  Status: ❌ BLOCKED - Fix critical/high issues                  │
└─────────────────────────────────────────────────────────────────┘

Triple Engine Example (All Three)

┌─────────────────────────────────────────────────────────────────┐
│  CODE REVIEW RESULTS - TRIPLE ENGINE                            │
├─────────────────────────────────────────────────────────────────┤
│                                                                 │
│  ✅ UNANIMOUS (All 3 found):                                    │
│  🔴 SQL injection in auth.ts:45                                 │
│                                                                 │
│  ✅ MAJORITY (2 of 3 found):                                    │
│  🟠 Memory leak - unclosed stream in upload.ts:34 (Codex+Gemini)│
│  🟡 Missing error handling in api.ts:112 (Claude+Codex)         │
│                                                                 │
│  🔷 CLAUDE ONLY:                                                │
│  🟠 Potential race condition in worker.ts:89                    │
│                                                                 │
│  🔶 CODEX ONLY:                                                 │
│  🟡 N+1 query pattern in orders.ts:156                          │
│                                                                 │
│  🟢 GEMINI ONLY:                                                │
│  🟡 Consider using batch API for better performance             │
│  🟢 Type could be more specific in types.ts:23                  │
│                                                                 │
├─────────────────────────────────────────────────────────────────┤
│  SUMMARY                                                        │
│  Unanimous: 1 | Majority: 2 | Single: 5                         │
│  Critical: 1 | High: 2 | Medium: 3 | Low: 2                     │
│  Status: ❌ BLOCKED - Fix critical/high issues                  │
└─────────────────────────────────────────────────────────────────┘

When to Use Each Mode