RAG and QWED address different failure modes. RAG improves what the model can reference. QWED verifies whether the model’s final claim or action is correct.Documentation Index
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Core difference
| Tool | Primary job | Best at |
|---|---|---|
| RAG | Retrieve context | Private knowledge, recent information, document grounding |
| QWED | Verify outputs | Deterministic validation, policy enforcement, tool-call checks |
When RAG is enough
Use RAG when the model needs:- Access to private documents
- Recent facts or changing policies
- Better grounding from source material
When you need QWED
Use QWED when the model must:- Produce correct calculations from retrieved data
- Obey policy and approval rules
- Verify tool calls before execution
- Prevent prompt injection from turning retrieved context into unsafe actions
Best-practice stack
Use both together:- RAG retrieves the relevant documents.
- QWED verifies the answer, decision, or action derived from those documents.