LangChain v1.8.7: Assistant Tool Calls Refactoring & TextChunk Support

AI Impact Summary

Version 1.8.7 introduces internal refactoring and bug fixes within the assistant tool calls and tool message handling. Specifically, the index field has been removed from assistant tool_calls, and a new 'is_special' flag has been added to control tool calls. This update also adds TextChunk support to ToolMessage, suggesting a shift towards more complex tool interactions.