docs: move additional exploration docs to docs/audits/

Move 6 recently generated inquiry and MCP exploration documents to the centralized audit directory. Co-Authored-By: Paperclip <noreply@paperclip.ing>
2026-04-11 01:41:23 +07:00
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+# MCP Module - Quick Reference & Testing Guide
+
+## 📋 Module at a Glance
+
+| Aspect | Details |
+|--------|---------|
+| **Location** | `apps/api/src/modules/mcp/` |
+| **Total Files** | 4 source files |
+| **Test Files** | 1 test file (174 lines) |
+| **Architecture** | Presentation layer only |
+| **Testing Framework** | Vitest |
+| **Test Coverage** | Controller well tested ✅ |
+
+## 📁 Complete File Listing
+
+```
+MCP Module Files:
+✅ index.ts (1 line)
+✅ mcp.module.ts (22 lines)
+✅ presentation/mcp-transport.controller.ts (102 lines)
+✅ presentation/__tests__/mcp-transport.controller.spec.ts (174 lines)
+```
+
+## 🏗️ Architecture
+
+### Current (Simplified - Presentation Only)
+```
+Presentation Layer ✅
+├── McpTransportController
+│   ├── GET /mcp/servers
+│   ├── GET /mcp/:serverName/sse  
+│   └── POST /mcp/:serverName/messages
+└── Tests (174 lines)
+
+McpIntegrationModule (22 lines)
+├── Module config
+├── Service setup
+└── Module lifecycle
+```
+
+### Missing Layers (Not Implemented)
+```
+❌ Domain Layer (no entities, events, business logic)
+❌ Application Layer (no handlers, commands, queries)
+❌ Infrastructure Layer (no repositories, adapters)
+```
+
+## 🧪 Testing Overview
+
+### Test File: mcp-transport.controller.spec.ts (174 lines)
+- **Total Tests**: 11
+- **Test Suites**: 4 describe blocks
+- **Coverage**: 100% of controller endpoints
+
+### Test Breakdown
+```
+1. Security Decorators (4 tests)
+   ├── JwtAuthGuard applied
+   ├── listServers throttle (30 req/60s)
+   ├── handleSse throttle (5 req/60s) ⚡ stricter
+   └── handleMessage throttle (30 req/60s)
+
+2. listServers (2 tests)
+   ├── Returns server list
+   └── Handles empty list
+
+3. handleSse (3 tests)
+   ├── Throws NOT_FOUND for missing server
+   ├── Creates transport & connects
+   └── Cleans up on connection close
+
+4. handleMessage (2 tests)
+   ├── Throws BAD_REQUEST for missing sessionId
+   └── Throws NOT_FOUND for expired session
+```
+
+## 🎯 Key Classes
+
+### McpIntegrationModule
+```typescript
+class McpIntegrationModule implements OnModuleInit {
+  constructor(
+    typesenseClient: TypesenseClientService,
+    mcpRegistry: McpRegistryService,
+    logger: LoggerService,
+  ) {}
+  
+  async onModuleInit(): Promise<void> {
+    // Set typesense client, re-initialize servers, log results
+  }
+}
+```
+
+### McpTransportController
+```typescript
+@Controller('mcp')
+@UseGuards(JwtAuthGuard)
+class McpTransportController {
+  listServers(): { servers: string[] }
+  
+  async handleSse(serverName, user, req, res): Promise<void>
+  
+  async handleMessage(serverName, user, req, res): Promise<void>
+}
+```
+
+## 🔧 Testing Patterns
+
+### Module Mocking
+```typescript
+vi.mock('@goodgo/mcp-servers', () => ({
+  SSEServerTransport: class MockSSE {
+    sessionId = 'mock-session-id';
+    handlePostMessage = vi.fn().mockResolvedValue(undefined);
+  },
+}));
+```
+
+### Service Mocking
+```typescript
+mockRegistry = {
+  getServerNames: vi.fn(),
+  getServer: vi.fn(),
+};
+```
+
+### Decorator Verification
+```typescript
+const guards = Reflect.getMetadata('__guards__', McpTransportController);
+const throttleLimit = Reflect.getMetadata('THROTTLER:LIMITdefault', method);
+```
+
+## 📚 Testing Examples from Other Modules
+
+### Auth Module Pattern (Simple)
+- Minimal dependencies
+- Direct handler instantiation
+- Focus on behavior verification
+
+### Payments Module Pattern (Complex)
+- Multiple dependency mocks
+- Business rule testing  
+- Event bus verification
+
+### Domain Entity Pattern
+- Explicit vitest imports
+- State transition testing
+- Domain event verification
+- Error handling with Result types
+
+### Infrastructure Pattern
+- External service simulation
+- Security testing (crypto)
+- Complex test data builders
+
+## 🚀 Running Tests
+
+```bash
+# Run all MCP tests
+pnpm test -- src/modules/mcp
+
+# Run with watch
+pnpm test -- --watch src/modules/mcp
+
+# Run with coverage
+pnpm test -- --coverage src/modules/mcp
+
+# Run specific test
+pnpm test -- src/modules/mcp/presentation/__tests__/mcp-transport.controller.spec.ts
+```
+
+## 💡 Recommendations
+
+### High Priority
+- ✅ Controller is well tested - maintain this
+- 📝 Add tests for McpIntegrationModule.onModuleInit()
+- 📝 Test module dependency injection
+
+### Lower Priority
+- 🏗️ If domain logic added, follow payments patterns
+- 🏗️ If handlers added, use CQRS patterns
+- 🏗️ Add integration tests for SSE lifecycle
+