# Changelog for `langchain-hs-core`
All notable changes to this package will be documented in this file.
## 0.0.5.0 - 2026-09-10
- Initial standalone Hackage release of `langchain-hs-core`.
- Zero-dependency pure core architecture.
- First-class `RunnableTree` GADT AST with sequential (`|>>`), parallel (`&>&`), and fallback (`>>>#`) operators.
- `ChatModel` effect-polymorphic interface.
- Multi-modal `ContentBlock` and message structures.
- Conduit-based `StreamEvent` and streaming protocol.
- Decoupled `LangchainT env m a` transformer.
- Typed `Tool` and `FunctionDefinition`.