[Release] langchain-ai/langchain langchain-core==1.3.0: langchain-core==1.3.0

langchain-core version 1.3.0 has been released with improvements to streaming metadata, traceable invocation parameters, SSRF security hardening, and garbage collection support. Key changes include adding chat model and LLM invocation params to traceable metadata, restoring cloud metadata IPs in SSRF policy, and implementing reference counting for inherited run trees. The release also includes dependency updates and bug fixes for OpenAI responses API conversion.

Key Points

• •Chat model and LLM invocation parameters are now included in traceable metadata for better observability
• •SSRF (Server-Side Request Forgery) security utilities have been hardened with improved cloud metadata IP handling and link-local range support
• •Reference counting implementation for inherited run trees enables proper garbage collection and memory management
• •Streaming metadata behavior has been optimized for performance while maintaining backwards compatibility with checkpoint_ns
• •OpenAI responses API conversion now properly handles content blocks without type keys
• •Pytest dependency updated to version 9.0.3 for improved testing capabilities
• •Multiple alpha releases (1.3.0a1, 1.3.0a2, 1.3.0a3) preceded the stable 1.3.0 release for iterative improvements

Workflow Diagram

Concepts