ModelRetryMiddleware

This release introduces significant improvements to the MCP (Multi-modal Conversational Protocol) handling, including new elicitation features and tool conversion. It also brings general bug fixes and refactors across various components.

This release introduces standard model exception types and support for custom token counters in ContextEditingMiddleware. It also includes bug fixes for exception handling and schema ordering.

LangChain 1.1 introduces ModelRetryMiddleware, enhanced SummarizationMiddleware with context window support, and SystemMessage support in agent creation. It also includes critical fixes for tool call ordering and Anthropic tool execution.