Auto-activate for msgspec imports, msgspec.Struct, msgspec.Meta, msgspec.json, msgspec.msgpack, tagged unions, enc_hook, dec_hook, or convert(). Use when defining msgspec models, serialization codecs, validation constraints, discriminated unions, or Litestar DTO data shapes. Not for Pydantic, dataclasses, attrs, or ORM models unless converting at a boundary.
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msgspec Skill
msgspec is a high-performance Python library for serialization, deserialization, and validation. Structs are ~5x more memory-efficient than regular classes and serialize faster than Pydantic or dataclasses.
Code Style Rules
Use PEP 604 for unions: T | None (not Optional[T])
from __future__ import annotations rule — Modules that definemsgspec.Struct subclasses (library-like — runtime introspected) must NOT use from __future__ import annotations. Consum
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