go-gen-jsonschema

Code generator that turns Go structs into JSON Schema files plus Go accessors (Schema(), optionally ValidateJSON()) and selectable JSON/YAML decoding for registered interfaces. Built for LLM function calling: properties are emitted in struct field order (deterministic, prompt-controllable), additionalProperties: false, ordinary and nullable fields required, Optional[T] fields optional, and Go doc comments become the schema description fields.

Import path: github.com/tylergannon/go-gen-jsonschema (library markers) and github.com/tylergannon/go-gen-jsonschema/gen-jsonschema (CLI).

Mental model: two build-tagged files