Kotlin/kotlinx-schema

Supports LLM function calling schemas (OpenAI/Anthropic format) with automatic strict mode and parameter validation, alongside comprehensive type handling including sealed class hierarchies with discriminators and `$ref`/`$defs` deduplication. Multi-framework annotation detection recognizes `@Description`, Jackson, LangChain4j, and custom annotations without code changes, enabling schema generation for third-party libraries. Offers three generation modes—compile-time KSP (zero runtime overhead, multiplatform), runtime reflection (JVM-only), and serialization-based (kotlinx.serialization)—with a type-safe Kotlin DSL for programmatic schema construction.

105 stars.