Handler class name
dotnet run — wolverine-diagnostics codegen-preview —handler CreateOrderHandler
**Preview an HTTP endpoint** (requires Wolverine.HTTP; format: `"METHOD /path"`):
```bash
dotnet run -- wolverine-diagnostics codegen-preview --route "POST /api/orders"
dotnet run -- wolverine-diagnostics codegen-preview --route "GET /api/orders/{id}"
Preview a proto-first gRPC service wrapper (requires Wolverine.Grpc; accepts the proto service name, the stub class name, or the generated file name):