The thinking family's one implementation of the ThinkingPhase SPI: the deep-research RetrievalPhase, plus the two-phase machinery (TwoPhaseThinkingExecutor) it builds on. A thinking key activates a retrieval pass that searches and crawls through the hosted web tools declared for it, streams its narration as the response's reasoning events, and injects its consolidated findings as a trailing conversation pair the answering pass cites; the ...