March 12, 2026 1 min read
Anti-Hallucination Architecture: Grounding AI in Real Data
Deep Dive
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A AI chat route with 7 custom tools that forces GPT-4o to use real API data instead of hallucinating prices and ratings.
Three-Layer Anti-Hallucination
1. Structured Input: Validated DiagnosisRequest schema ensures structured context. 2. Tool Grounding: "CRITICAL: You must use tools to provide REAL data. Never invent prices." 7 tools return real data from APIs. 3. Response Format: GROUNDING_RULES require citing tool results and flagging unavailable data.
The 7 Tools
getCostEstimate (DB lookup), searchContractors (Yelp/Foursquare), searchProducts (web crawler), searchReddit (user experiences), checkRecalls (CPSC/NHTSA), searchUtilityRebates (energy rebates), draftContractorEmail (RFQ generation). Each has bounded costs and returns verifiable data.