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Build a Replit Agents Prototype

Start a tiny project in the browser, ask for a change, review the diff, apply, run, and repeat.

Updated: September 17, 2025

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Replit

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Tip: keep tasks small and always ask for a reviewable diff.

What you’ll build

A tiny web app with one route and one refactor—designed to feel the loop of propose → diff → apply → run.

Option A — Node/Express

  • Add /health route returning JSON.
  • Refactor one util into a module with a simple test.

Option B — Next.js (pages or app)

  • Add a minimal API route.
  • Create a tiny component and document it with comments.

Workflow

One small task

• Name the file(s), function, and the exact goal.

Ask for a diff

• Prefer changes you can review—see diff.

Apply and run

• Install packages, run locally, check logs/tests.

Iterate fast

• If off-track, undo; restate the goal with constraints.

Step-by-step

  1. Create a new Replit project (Node.js or Next.js) and click Run.
  2. Describe a single change and where it should happen.
  3. Ask specifically for a diff. Read it like a PR, then apply.
  4. Install any packages it mentions, run, and verify locally.
  5. Repeat for one tiny refactor (rename util, add test, etc.).