# Tasks: rag-hybrid-search-rrf

- [x] 1. Add RRF fusion utility
- [x] 2. Extend KnowledgeSearchRequest/Hit metadata for fusion ranks
- [x] 3. Implement hybrid multi-path search in VectorKnowledgeSearchAdapter
- [x] 4. Wire retrieval.search.mode and rrf config
- [x] 5. Pass mode from LookupKnowledgeTool / retriever
- [x] 6. Unit tests for RRF and hybrid adapter ordering
- [x] 7. Verify dense mode regression tests still pass