Protocol Buffers and gRPC Designer Skill

Overview

This skill specializes in designing Protocol Buffers schemas and gRPC service definitions with a focus on backward compatibility, performance, and cross-language interoperability.

Capabilities

• Design .proto files following Google's style guide and best practices
• Implement gRPC service definitions with streaming support
• Validate wire format backward compatibility
• Generate language-specific stubs for multiple targets
• Configure proto linting and breaking change detection
• Design efficient message structures for performance
• Implement gRPC interceptors and middleware patterns

Target Processes

• API Design Specification
• Backward Compatibility Management
• Multi-Language SDK Strategy

Integration Points

• buf (schema registry, linting, breaking change detection)
• protoc (Protocol Buffer compiler)
• grpcurl (gRPC testing)
• gRPC-Gateway (REST transcoding)
• Connect (modern gRPC alternative)

Input Requirements

• Service domain requirements
• Message structure definitions
• Streaming requirements (unary, server, client, bidirectional)
• Target languages for code generation
• Backward compatibility policy

Output Artifacts

• .proto schema files
• buf.yaml configuration
• Generated language stubs
• Breaking change analysis report
• API documentation from proto comments

Usage Example

skill:
  name: protobuf-grpc-designer
  context:
    protoDirectory: ./proto
    targetLanguages:
      - go
      - python
      - typescript
    enableBufLint: true
    checkBreakingChanges: true
    streamingRequired: true

Best Practices

1. Use package names that reflect domain boundaries
2. Reserve field numbers when removing fields
3. Use well-known types (Timestamp, Duration, etc.)
4. Document all messages and fields with comments
5. Version services through package names
6. Implement proper error handling with Status codes