The "Tool Search Tool" is like a clever addition that could easily be added yourself to other models / providers. I did something similar with a couple of agents I wrote.
First LLM Call: only pass the "search tool" tool. The output of that tool is a list of suitable tools the LLM searched for.
Second LLM Call: pass the additional tools that were returned by the "search tool" tool.
First LLM Call: only pass the "search tool" tool. The output of that tool is a list of suitable tools the LLM searched for. Second LLM Call: pass the additional tools that were returned by the "search tool" tool.