[Release] langchain-ai/langchain langchain-core==1.4.9: langchain-core==1.4.9

langchain-core version 1.4.9 is a maintenance release that includes bug fixes for output parsers, error message improvements, async context handling, and dependency updates. Key improvements address langsmith loader errors, XML/Pydantic parser bugs, Google docstring parsing issues, and code quality enhancements. The release also updates langsmith to 0.8.18, jupyterlab to 4.5.9, and vcrpy to 8.2.1.

Key Points

• •Fixed langsmith loader error messages for better debugging and user experience
• •Resolved output parser bugs in xml.py and pydantic.py modules
• •Fixed async context handling by using asyncio.get_running_loop() instead of deprecated patterns
• •Improved Google docstring parser to correctly handle continuation lines with colons
• •Prevented dict variable shadowing in language model implementations
• •Enhanced error handling by adding descriptive messages to bare ValueError calls
• •Applied ruff preview rules for improved code style and quality
• •Updated langsmith dependency from 0.8.0 to 0.8.18 for bug fixes and features
• •Bumped jupyterlab from 4.5.7 to 4.5.9 for notebook environment improvements
• •Updated vcrpy from 8.1.1 to 8.2.1 for HTTP recording/playback enhancements

Concepts