langchain

8b1e2546 - fix(core): add `on_tool_error` to `_AstreamEventsCallbackHandler` (#30709)

fix(core): add `on_tool_error` to `_AstreamEventsCallbackHandler` (#30709) Fixes https://github.com/langchain-ai/langchain/issues/30708 --------- Co-authored-by: Mason Daugherty <mason@langchain.dev>