LangChain xAI integration adds reasoning_effort parameter, drops legacy features

Full analysis

LangChain released version 1.3.0 of its xAI partner integration (langchain-xai), introducing reasoning_effort as a standard chat model parameter — a control knob that lets agent builders tune how much compute a model spends on reasoning before responding. The release also drops the unsupported stop parameter, removes deprecated Live Search support, and adds base_url aliasing plus an XAI_API_BASE environment variable for flexible endpoint configuration. Smaller improvements include content-block-centric streaming (v2) from langchain-core and package version tracking in tracing metadata, which helps agent developers debug and observe model calls more precisely.