CourseRetrieval-Augmented Generation: The Complete Course · Module 9: Generation, Grounding, and Citations · part 64 of 95
Part 64 · Module 9: Generation, Grounding, and Citations

Lab: The answer step, guarded and checked

64 min read·13 Oct 2026
Module 9 · Lab · About 75 minutes · Needs: lessons 1 to 4 of this module, the Module 6 and 8 labs (or the cells in Step 1), and a free Groq or Gemini key

What you are building

ELLIE'S QUESTION THROUGH THE ANSWER STEP 3 documents from Module 8 respond() answer.py guard.py trust grounding rules, NLI send checked claims hand over with reasons
One function, respond(), runs the guard (blue) and the grounding checks on every draft: a fully checked answer is sent (green), anything else goes to a person with reasons (amber).

On Friday 9 October Ellie asks whether her repeated E7 fault is covered. Module 8's context assembler sends three documents to the answer step; a bigger budget would also send the forum post with the injected instruction. This lab turns the module's four lessons into three package files. hollin/guard.py marks untrusted text, keeps it last and checks every address and every document's scope. hollin/answer.py holds the system prompt, the answer form and its contract, and respond(), which runs every check in order. hollin/grounding.py holds the checks that read meaning: rules and a local NLI model. Then you replay the attacks with a scripted model, write tests that need no key, and commit. The real model is called twice, in Step 5.

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