Available tools should be recorded in gen_ai.request.available_tools

[linear]

I noticed that in our LangChain integration we only record the tools that were actually being called during the handleLLMEnd callback. However, we do not record which tools are initially available in gen_ai.request.available_tools. These can be provided via model.bindTools() as documented here (potentially also directly in the invoke call as is done in our langchain tools test but I did not find any documentation for that).

[linear]

JS-1161

[RulaKhaled]

This is a limitation of LangChain callbacks. We are trying to communicate this and other related issues to the LangChain team, as it is almost impossible to capture these tools within the callback lifecycle.