LangChain-Anthropic 1.5.6 fixes tool handling and model profiles

LangChain just pushed a critical patch for its Anthropic integration with version 1.5.6, addressing three specific issues that could have disrupted workflows for developers relying on Anthropic's latest models. The most significant fix normalizes tool_search_tool_result blocks, ensuring consistent handling of tool outputs across different Anthropic models. This is particularly important for applications using complex tool chains where output formatting consistency is critical.

The update also corrects model profile data for Anthropic's Fable 5, Sonnet 5, and Opus 4.1, which had incorrect specifications in previous versions. These profile corrections ensure that LangChain's model routing and selection logic will work as intended when targeting these specific models. The changes were committed on August 13th and are now available via the langchain-anthropic==1.5.6 package on GitHub.