Goals:

• Ensure consistency between protobuf and JSON schema.
• Establish a canonical source for type definitions.

Contents:

• Protobuf definitions for all A2A types.
• Script/tooling to auto-generate JSON Schema from protobuf.
• CI checks to ensure schema sync.
• Documentation update to clarify that protobuf is the authoritative source.

Optional Enhancements:

• Include examples of how SDKs should consume the schema.
• Add a changelog or versioning strategy for schema evolution.