Constant SEARCH_RESULTS_CAP 

pub const SEARCH_RESULTS_CAP: usize = 30;

Maximum number of ToolSummary entries returned by a single ToolIndex::search call.

This cap exists to prevent “blank conditioning” — a failure mode observed when an LLM receives more candidate tools than it can effectively discriminate between. Searches that match more than this number of tools should be refined with a more specific query.