Minimum-first framing: require fair A/B comparison, one quoted chunk, and one privacy/copyright boundary note before any extension work.

Day 1 · Block 3

Context

Use context engineering and retrieval to improve reliability over a no-context baseline with one explicit boundary disclosure.

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Block Write-up

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Exercise overview: Retrieval A/B with local corpus

Inputs

• exercises/03/retrieval_ab.py
• Local corpus in exercises/03/local_docs

Deliverable

A/B run trace + one retrieval-fixed failure + one source-backed comparison note.

Target

Can you look up some services that offer RAG systems? How expensive is this?

Submission

• Use the live launcher: Live Exercises
• Direct prefilled form: E03 submission link

Checklist

• Make one explicit design decision.
• Include one verification check.
• State one limitation or risk.

Common failure modes

• Baseline and retrieval runs use different prompts/settings.
• Improvement claimed without source chunk evidence or boundary disclosure.

Extension task (optional)

Add metadata filtering and report precision difference.