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You

I built a RAG system but it keeps returning irrelevant documents.

AI mentor

Let's check retrieval first. What does your chunker do with section headings — and what's your recall@5 on the eval set?

You

Recall@5 is 0.41. Headings get split from their paragraphs.

AI mentor

That's the lead. Keep the heading with its first chunk as metadata, re-run the eval, and tell me what changes.