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If you’re building agentic systems with lots of tools, this Tool Search guide is the part you should read. The whole point is to stop polluting your context window with tool schemas and instead fetch what you need on demand—OpenAI shows ~47% token savings in their example.

Pros

+Cuts context/tool overhead for agents
+Improves token efficiency and scalability of tool-heavy workflows

Cons

-You still need to design sensible tool metadata for search to work well

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GPT-5.4: Everything You Need to Know

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Highlights

+Cuts context/tool overhead for agents
+Improves token efficiency and scalability of tool-heavy workflows

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