tool_search
A meta-tool mechanism recommended in OpenAI's function calling guidance, used to defer the loading of infrequently used tools and thereby reduce the number of candidate tools in a single request. This narrows the model's decision space and saves tokens.
Timeline (last 90 days)
OpenAI's function calling guide recommends using tool_search to lazily load infrequently used tools rather than cramming all tools into a single request.
The OpenAI Responses API provides a `tool_search` tool, supported on gpt-5.4 and later versions, and also supports setting `defer_loading` for functions or MCP servers.
All Facts (2)
OpenAI's function calling guide recommends using tool_search to lazily load infrequently used tools rather than cramming all tools into a single request.
50%UnverifiedThe OpenAI Responses API provides a `tool_search` tool, supported on gpt-5.4 and later versions, and also supports setting `defer_loading` for functions or MCP servers.
50%