How to Prevent AI Chatbot Hallucinations with Custom Knowledge and Q&A Overrides
Learn how SiteMind’s strict cosine similarity thresholds, Reciprocal Rank Fusion (RRF), and instant Q&A overrides guarantee 100% grounded, hallucination-free customer support answers.
What you will achieve
- Configure strict cosine similarity refusal thresholds
- Add instant Q&A overrides that bypass document re-crawling
- Turn unanswered customer questions into a prioritized knowledge base roadmap
Prerequisites
- A SiteMind workspace with at least one indexed knowledge source
Understand the Grounding Architecture
Generic LLMs hallucinate because they predict next words from general training data. SiteMind enforces a 2-stage verification pipeline: Reciprocal Rank Fusion (dense pgvector + sparse full-text search) retrieves only high-confidence matches. If cosine similarity falls below your threshold, the assistant politely declines rather than guessing.
Similarity & Refusal Thresholds Are Enforced Automatically
There is nothing to configure here. Grounding is enforced automatically on the server: an answer is only written when the retrieved content is similar enough to the question; otherwise the assistant says it couldn’t find the information in your content.
Create Instant Custom Q&A Overrides
Need your assistant to answer a specific promotion, coupon policy, or VIP hotline question without editing your live website? Go to Dashboard > Knowledge > Custom Q&A. Create a pair — changes update vector embeddings instantly.
Review Knowledge Gaps from Unanswered Queries
Open Dashboard > Conversations > Knowledge Gaps. SiteMind automatically clusters questions the assistant declined to answer, giving your content team an exact list of missing FAQs to write.
Frequently asked questions
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