graph TD
  Agent[Agentic IDE / Claude Code / Cursor] -->|MCP Protocol / stdio| Sentinel[🛡️ Drizzle Sentinel MCP Server]
  
  subgraph Tools [MCP Governance Toolsuite]
    Sentinel --> T1[🔍 inspect_drizzle_schema]
    Sentinel --> T2[🚨 lint_drizzle_migration]
    Sentinel --> T3[🩺 detect_schema_drift]
    Sentinel --> T4[⚡ explain_query_plan]
  end

  T1 --> Parser[Drizzle Schema AST Parser]
  T2 --> Engine[Rules Engine: NO_DROP, DEFAULT_ON_NOT_NULL, UNINDEXED_FK]
  T3 --> Drift[Drift Doctor & Safe Patch Generator]
  T4 --> Sandbox[Read-Only Query Sandbox & Smell Detector]

  Parser --> AppCode[TypeScript Drizzle Schemas]
  Engine --> Migrations[Drizzle Migration .sql Files]
  Drift --> Database[(PostgreSQL / SQLite / MySQL)]

drizzle-sentinel-mcp/
├── packages/
│   ├── mcp-server/       # TypeScript MCP server implementation
│   │   ├── src/tools/    # Tool handlers (inspect, lint, drift, sandbox)
│   │   ├── src/services/ # AST & schema parsers
│   │   └── src/index.ts  # Stdio server entrypoint
│   └── rules-engine/     # AST & regex defensive migration rules
├── apps/
│   └── demo-service/     # Express + Drizzle ORM reference application
├── tests/                # Vitest comprehensive unit & integration test suite
├── turbo.json            # Turborepo task pipeline
├── CLAUDE.md             # Agentic guidelines & operating rules
└── README.md

npm install
npm run build

npm test

{
  "mcpServers": {
    "drizzle-sentinel": {
      "command": "node",
      "args": ["<path-to-repo>/packages/mcp-server/dist/index.js"]
    }
  }
}