serialization

SKILL.md

| Examples | Protobuf, MessagePack, System.Text.Json (source gen) | Newtonsoft.Json, BinaryFormatter | | Type info in payload | No (external schema) | Yes (type names embedded) | | Versioning | Explicit field numbers/names | Implicit (type structure) | | Performance | Fast (no reflection) | Slower (runtime reflection) | | AOT compatible | Yes | No |

Recommendation: Use schema-based serialization for anything that crosses process boundaries.

| REST APIs | System.Text.Json (source gen) | Standard, AOT-compatible | | gRPC | Protocol Buffers | Native format, excellent versioning | | Actor messaging | MessagePack or Protobuf | Compact, fast, version-safe | | Event sourcing | Protobuf or MessagePack | Must handle old events forever | | Caching | MessagePack | Compact, fast |

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