What Is a Harness? The 98.4% Principle

#!/usr/bin/env bash
# harness-audit.sh — 현재 하네스 완성도 진단

echo "=== HARNESS AUDIT ==="
score=0

# Layer 1: Memory
if [ -f "$HOME/.claude/CLAUDE.md" ]; then
  lines=$(wc -l < "$HOME/.claude/CLAUDE.md")
  if [ "$lines" -le 200 ]; then
    echo "✅ Layer 1: Global CLAUDE.md exists ($lines lines)"
    ((score++))
  else
    echo "⚠️  Layer 1: CLAUDE.md too long ($lines lines — target <200)"
  fi
else
  echo "❌ Layer 1: No global CLAUDE.md (~/.claude/CLAUDE.md)"
fi

# Layer 2: Tools (MCP)
mcp_count=$(cat ~/.claude/settings.json 2>/dev/null | \
  python3 -c "import json,sys; d=json.load(sys.stdin); print(len(d.get('mcpServers',{})))" 2>/dev/null || echo 0)
if [ "$mcp_count" -gt 0 ]; then
  echo "✅ Layer 2: $mcp_count MCP server(s) configured"
  ((score++))
else
  echo "❌ Layer 2: No MCP servers configured"
fi

# Layer 3: Permissions
deny_count=$(cat ~/.claude/settings.json 2>/dev/null | \
  python3 -c "import json,sys; d=json.load(sys.stdin); print(len(d.get('permissions',{}).get('deny',[])))" 2>/dev/null || echo 0)
if [ "$deny_count" -gt 0 ]; then
  echo "✅ Layer 3: $deny_count deny rule(s) configured"
  ((score++))
else
  echo "❌ Layer 3: No deny rules in permissions"
fi

# Layer 4: Hooks
hook_count=$(cat ~/.claude/settings.json 2>/dev/null | \
  python3 -c "import json,sys; d=json.load(sys.stdin); print(len(d.get('hooks',{})))" 2>/dev/null || echo 0)
if [ "$hook_count" -gt 0 ]; then
  echo "✅ Layer 4: $hook_count hook event(s) configured"
  ((score++))
else
  echo "❌ Layer 4: No hooks configured"
fi

# Layer 5: Observability
if ls ~/.claude/projects/*/memory/MEMORY.md 2>/dev/null | head -1 | grep -q .; then
  echo "✅ Layer 5: Memory files found"
  ((score++))
else
  echo "❌ Layer 5: No MEMORY.md files in any project"
fi

echo ""
echo "Score: $score/5"
[ $score -le 1 ] && echo "Level: 일반 개발자 — 즉시 Layer 1부터 시작하세요"
[ $score -eq 2 ] && echo "Level: 입문 — Layer 2, 4가 핵심입니다"
[ $score -eq 3 ] && echo "Level: 중급 — 거의 다 왔습니다"
[ $score -ge 4 ] && echo "Level: 프로덕션 레디 — 지속적 개선 단계"