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Agentic RAG: sections and modules
T9.2

Self-Correcting RAG: CRAG & Self-RAG

Build CRAG: grade documents, rewrite the query, fall back to web search (Tavily).

Lessons
5 lessons
By
Sourav Banerjee
Prerequisites
None

Lessons

Start module
5 lessons
  1. 1
    Self-Correcting RAG: CRAG & Self-RAG: overview

  2. 2
    Corrective RAG in LangGraph with web-search fallback

  3. 3
    Self-RAG: retrieve-or-not, relevance, groundedness, utility

  4. 4
    Trade-offs: when correction is worth the extra calls

  5. 5
    Self-Correcting RAG: CRAG & Self-RAG: interview questions

Practise and Check

Deliverable
Out-of-corpus stress test: send questions the corpus cannot answer and compare the baseline, CRAG and Self-RAG on refusals, web fallbacks and hallucinated answers.
Assessment
Answer the five Interview questions without notes, then run the lab.
Interview probe
Larkspur's support assistant runs CRAG with a web fallback. A customer asks what happens when their server goes down, and the assistant quotes another provider's availability guarantee. The handbook has the right answer. What went wrong, and what do you change?
Common mistakes
  • Falling back to web search for a private handbook's policies
  • Updating the iteration counter inside a routing function instead of a node
  • Adding more checks when the missing evidence was never retrieved

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