Exercises core tool-use behaviors: correct selection, args, order, count bounds, OR-paths, and prohibitions. Trace-only; no execution.

Encourages provider-native tool calling; if unavailable, falls back to trace-only TOOL_CALL lines. Scoring accepts either native success (final answer) or valid trace.

Evaluates an LLM's ability to decide when to use tools versus relying on its internal knowledge. Tests for overconfidence (not searching when it should) and underconfidence (searching unnecessarily).