AI Engineering/Phase 14/Lesson 39

Reviewer Agent: Separate Builder from Marker

The agent that wrote the code cannot grade it. A reviewer is a second loop with a different system prompt, a different goal, and read-only access to everything the builder produced. The gap between builder and reviewer is where most reliability lives.

Build 55 min Python (stdlib)

Prerequisites: Phase 14 · 38 (Verification Gate)

#Learning Objectives

State why the same agent cannot reliably review its own work.
Build a reviewer agent loop that consumes builder artifacts and emits a structured review report.
Author a reviewer rubric that grades specific dimensions, not vibes.
Wire the reviewer into the workbench so the human review step starts from a real artifact.

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The text and code of this lesson are based on AI Engineering from Scratch by Rohit Ghumare, MIT licensed.