protobuf

# Protocol Buffers ## When You Need This Skill - Creating or editing `.proto` files - Setting up `buf.yaml` or `buf.gen.yaml` - Designing gRPC or Connect services - Adding protovalidate constraints - Troubleshooting buf lint or breaking change errors ## Core Workflow ### 1. Match Project Style Before writing proto code, review existing `.proto` files in the project. Match conventions for naming, field ordering, structural patterns, validation, and documentation style. If none exists, ask the user what style should be used or an existing library to emulate. ### 2. Write Proto Code - Apply universal best practices from [best_practices.md](references/best_practices.md) - Add [protovalidate](references/protovalidate.md) constraints to every field—this is not optional for production APIs - For service templates, see [assets/](assets/) ### 3. Verify Changes **Always run after making changes:** ```bash buf format -w && buf lint ``` Check for a Makefile first—many projects use `make lint` or `make format`. Fix all errors before considering the change complete. ## Quick Reference | Task | Reference | |------|-----------| | Field types, enums, oneofs, maps | [quick_reference.md](references/quick_reference.md) | | Schema evolution, breaking changes | [best_practices.md](references/best_practices.md) | | Validation constraints | [protovalidate.md](references/protovalidate.md) | | Complete service examples | [examples.md](references/examples.md), [assets/](assets/) | | buf C...