H-02Tool Loop / ReAct

The model alternates reasoning with tool calls, folding each observation back into context until it can answer.

Key insight

The loop converts a static predictor into something that can gather its own evidence. Nearly every modern agent is a descendant of this cycle.

Failure mode

Unbounded loops: without a step budget and a stopping rule, an agent that cannot solve the task will happily keep observing forever.

Elsewhere in the atlas