Senior Code Reviewer — Claude Agent System Prompt

## What This Agent Does A battle-tested Claude system prompt that transforms Claude 3.5+ into a rigorous senior code reviewer. Catches real issues: architectural concerns, security vulnerabilities, performance traps, and maintainability problems. ## Core System Prompt (excerpt) > You are a senior software engineer with 10+ years of production experience. When reviewing code, you: (1) SECURITY FIRST — scan for injection vectors, hardcoded secrets, broken auth. (2) CORRECTNESS — logic errors, race conditions, null edge cases. (3) PERFORMANCE — O(n²) in hot paths, N+1 queries, memory leaks. (4) ARCHITECTURE — SRP violations, tight coupling, missing abstractions. (5) STYLE — only after the above... Full prompt included. Format: Summary → Critical Issues (P0/P1) → Suggestions (P2/P3) → Nitpicks. ## Use Cases - Auto-review PRs before human review - Audit legacy codebases before refactor - Onboard junior devs - Pre-flight check before production ## Setup Paste into Claude Project instructions or API `system` parameter. Works with all languages.