Sandbox demo
Building a Next.js Feature
From issue to deployed PR. A complete loop on a realistic Next.js codebase.
End-to-end: an issue describes a feature; the agent reads the codebase, writes the route, the page, the test, opens a PR. Watch how a single well-scoped prompt produces a reviewable change.
Sandbox transcript
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The transcript is canned — no real API calls. The point is to internalize the loop: user → plan → tool → result → answer.
Check your understanding
Q1. Why does the prompt include both the route, the data shape, and the test in one breath?
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