Trustworthy RAG can be reduced to three engineering questions:
- Can every important claim be traced to evidence?
- Is the answer consistent with that evidence?
- Can the system abstain when the evidence is insufficient?
Each question requires a different control: source identifiers and versioning, grounded-generation checks, and an explicit uncertainty or refusal policy.
The practical goal is not to eliminate every hallucination. It is to make failures observable, measurable, and safer to handle.
Evidence state: engineering framework. Metric definitions and a small evaluation set will follow.