Lexical search retrieves content by matching literal query terms against terms in stored content. Unlike semantic search, it does not match different words merely because they have similar meanings. section 6.1.1
In retrieval-augmented generation (RAG), keyword search can work alongside vector search to find relevant information for an agent. A hybrid setup combines both tools and can inspect their calls before producing a grounded answer. section 6.5
A hybrid search query
For “At what exact time does the lightning strike the clock tower?”, a hybrid RAG agent uses keyword and vector search tools, then returns a grounded answer. section 6.5
