Tool Search
A search layer over available tool definitions that loads only the few relevant ones on demand instead of front-loading every definition into the prompt.
Plain English
The agent looks up the right tools when it needs them instead of carrying a thousand-tool menu everywhere.
Example
An agent with 1,000+ enterprise tools answers a tool-search query for 'refund', pulls in just the three Stripe tools it needs, and proceeds.
Why it matters
Anthropic reports an 85% token reduction and higher tool-calling accuracy (49% to 74% on Opus 4) when discovery replaces a bloated catalog.