Repeatable data and behavior

Use real Stripe and OpenAI SDKs with exact released twins. Node 22.6 or newer and npm are required; no platform account, vendor credential or source checkout is needed.

Its public example files are generated from the canonical shape a test tutorial, so the runnable code has one source. Files: package manifest, environment names, workflow and handler and scenario wiring. Install, init, review the selected vendors, then save the handler after init as that guide explains.

The workflow asserts a stored customer and frozen timestamp, a one-time 429 refusal, a scripted retry answer and customer read-back. Reset and restore the clock before the second walk. The guide owns the exact commands and expected output.

The model answer is authored behavior; no model quality is measured. The score is the named app assertions, not full vendor surface coverage. Restart rearms the once-handler; up alone resumes stored data. Use a task-owned disposable branch for reset.