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[Release] langchain-ai/langchain langchain-core==1.3.0a2: langchain-core==1.3.0a2

github-actions[bot]Apr 13, 2026

langchain-core version 1.3.0a2 is released with improvements to reference counting for garbage collection, streaming metadata optimizations, and various bug fixes. The release includes security hardening, documentation updates, and performance enhancements across multiple components including template sanitization, prompt loading, and token counting. Key fixes address symlink handling, model serialization, and tool schema validation.

  • Implement reference counting for inherited run trees to enable proper garbage collection and memory management
  • Optimize streaming metadata handling and reduce performance overhead in core operations
  • Add comprehensive sanitization to templates and deprecated prompt save paths to prevent security vulnerabilities
  • +7 more key points...
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