Useful RAG is not “more chunks”: it is evidence, coverage, and a response contract the business accepts.
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The symptom
The system answers with confidence… and invents a clause. In regulated sectors that is not a UX bug: it is business risk.
Design that reduces hallucinations
Canonical sources, validity metadata, mandatory citations, a polite refusal when there is no evidence, and continuous evaluation with a domain gold set.
Chunking and metadata aligned to the process
Answer with a citation or “not found”
Eval harness in CI, not only in demos
When to combine RAG and MCP
RAG for documentary knowledge; MCP for live system state. Together they cover “what the policy says” and “what is in the ERP right now.”
Operations
Without a corpus owner and an update pipeline, RAG rots. Kodex leaves runbooks: who approves sources, how a document is retired, how drift is measured.
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