**`gbrain search`** returns the top retrieved pages, ranked by hybrid scoring (vector + keyword + RRF + source-tier boost + reranker). Use it when you want raw material to skim: agent context windows, citation lookups, finding a specific quote. **`gbrain think`** runs the same retrieval, then composes a synthesized answer across the results with explicit citations to the source pages AND an honest note on what the brain doesn't know yet.
search和think的分离是一个重要的接口设计决策：它承认了「检索」和「推理」是两种不同的认知操作，应有不同的工具和成本模型。前者适用于「我知道要找什么」的场景，后者适用于「帮我想清楚这件事」的场景。这种分离也让用户对LLM成本有更精细的控制，而不是每次查询都强制走推理路径。