Lesson 5 of 17

Ask Devin to explain an unfamiliar repo

Turn a cold codebase warm in 15 minutes by pairing with Devin.

The workflow

Becoming productive in an unfamiliar codebase used to take a week. With Devin, it's a conversation. Here's the repeatable recipe:

  1. Point Devin at the repo. Either clone it locally or give Devin a link.
  2. Ask for a map. "Map out this repo. What are the top-level folders doing?"
  3. Ask for the hot path. "If I want to understand how a request flows through this system, which files should I read, in what order?"
  4. Ask about the weirdness. "What are three non-obvious things about this codebase I'd miss on a first read?"
  5. Verify. Now actually open the files Devin pointed you at and cross-check. If Devin is wrong about something, push back and ask again. Devin is a collaborator, not an oracle.

The capstone

Your Devin capstone below will have you produce an ORIENTATION.md for a real open-source project. This is a deliverable senior engineers actually produce when they join a team.

Looking ahead: in Module 3 you'll learn to write specs good enough that Devin can implement them start-to-finish without clarifying questions. Specs, not code, are the new artifact of engineering.

Devin capstone

Produce a repo orientation doc for a real open-source project

This is where the rubber meets the road. Describe what you want built below, and Devin — a real autonomous engineer — will open a PR against a scratch repo. Your job is to review it and iterate.

Scratch repo: DearMrFree/sof-ai-scratch-express

Rubric

  • ORIENTATION.md exists and is well-formatted.
  • The one-paragraph summary is accurate and specific, not generic.
  • Directory tree reflects the current repo, not stale structure.
  • 'Top 5 files' choices are defensible — would a senior agree?
  • At least one real 'trap' is identified (not a platitude).
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