skills/ HoangNguyen0403/agent-skills-standard

nestjs-transport

Configure gRPC, RabbitMQ, and monorepo contract patterns for NestJS microservices. Use when setting up gRPC service-to-service calls, RabbitMQ event-driven messaging, shared contract libraries, or microservice exception handling in NestJS.

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SKILL.md

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Microservices & Transport Standards

Priority: P0 (CRITICAL)

  • Synchronous (RPC): Use gRPC for low-latency, internal service-to-service calls (10x faster than REST/JSON).
  • Asynchronous (Events): Use RabbitMQ or Kafka for decoupling domains via fire-and-forget (emit()).

gRPC Setup

See implementation examples

RabbitMQ Setup

See implementation examples

Monorepo Contracts

  • Store all DTOs, .proto files, and Interfaces in libs/contracts.
  • Services never import from sibling services — only from contracts.
  • Semantic versioning of messages mandatory. Never change field type; add new field.

Exception Handling

Standard HttpException lost over RPC/TCP. Use RpcException with global filters:

See implementation examples

Serialization

  • Apply useGlobalPipes(new ValidationPipe({ transform: true })) in MicroserviceOptions setup, not HTTP.

Anti-Patterns

  • No cross-service imports: Services must import only from libs/contracts, never from sibling services.
  • No HttpException in RPC: Use RpcException with global RpcExceptionFilter for microservice errors.
  • No unversioned message schema: Add new fields; never change existing field types — consumers will break.

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