ArchitecturalARCHITECTURAL // HL7 FHIR R4 § 2.1Dr. Marcus Vance, MD
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How are you structuring system prompts in Claude Code / Cursor to force strict FHIR R4 JSON rather than conversational markdown?
We spent three weeks battling LLM hallucinations where Claude would return markdown wrappers around FHIR Bundles or drop required fields like meta.lastUpdated and subject.reference. Here is the exact two-tier prompt architecture that reached 99.4% schema compliance.
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