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Documentation to use "tool_search"? #1872

Description

@Smileynator

Documentation problem type

Missing documentation

Documentation location

none

What is wrong or missing?

I can't for the life of me figure out how to get a local model to do "tool search".
When a lot of tools are available in codex, the tools are not send to the LLM with every request, but a tools search is expected from Codex in order to include them on the next turn.
This behavior seems to be largely undocumented, all i know is that it comes natural to most OpenAI models, and my local Qwen can't even see a tool called tool search, it only sees the default internal toolset exposed (web_search and the like)
I see in requests that "tool_choice": "auto", is added in LM Studio in my case, but i doubt that is actually related.
As per the OpenCodex docs, there should just be proper support for this, but maybe i am just missing something really obvious, or my models are too dumb.

What should the documentation explain instead?

How to allow tool_search when a lot of MCP tools are available to codex.

Suggested wording or example

I wish i knew.

Additional context or attachments

No response

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