[Release] langchain-ai/langchain langchain==1.3.16: langchain==1.3.16

LangChain v1.3.16 introduces standard model exception types for improved error handling, adds support for custom token counters in ContextEditingMiddleware, and fixes critical issues with exception re-raising in ModelRetryMiddleware and schema ordering preservation. This release enhances the framework's robustness in handling errors and managing context within middleware components.

Key Points

• •Standard model exception types added to core for consistent error handling across the framework
• •ContextEditingMiddleware now supports custom token_counter implementations for flexible token management
• •ModelRetryMiddleware fixed to properly re-raise non-retryable exceptions instead of swallowing them
• •Documentation updated with improved error handling guidance for JSON schema operations
• •Schema ordering preservation fixed to maintain final repeated schema structure correctly
• •Focus on middleware reliability and exception handling robustness in this patch release

Workflow Diagram

Concepts