Combine vector and keyword search for improved retrieval. Use when implementing RAG systems, building search engines, or when neither approach alone provides sufficient recall.

Hybrid Search Implementation Patterns for combining vector similarity and keyword based search. When to Use This Skill Building RAG systems with improved recall Combining semantic understanding with exact matching Handling queries with specific terms (names, codes) Improving search for domain specific vocabulary When pure vector search misses keyword matches Core Concepts 1. Hybrid Search Architecture 2. Fusion Methods Method Description Best For RRF Reciprocal Rank Fusion General purpose Linear Weighted sum of scores Tunable balance Cross encoder Rerank with neural model Highest quality Cascade Filter then rerank Efficiency Templates and detailed worked examples Full template library and detailed worked examples live in references/details.md . Read that file when you need the concrete templates. Best Practices Do's Tune weights empirically Test on your data Use RRF for simplicity Works well without tuning Add reranking Significant quality improvement Log both scores Helps with debugging A/B test Measure real user impact Don'ts Don't assume one size fits all Different queries need different weights Don't skip keyword search Handles exact matches better Don't over fetch Balance recall vs latency Don't ignore edge cases Empty results, single word queries

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