See the flow.
Try the intent.

Seventeen compact book examples with real browser captures. Teaching variants use simulated orders, identities and faults. Portability screens, agent-control paths, judge responses and evaluation contracts are labeled illustrations.

Download the starter and scenario source ZIP ↓ · Copy the book prompts →

One intent. Three device experiences.

Course screen captures / tablet teaching extension

One intent. Three different coffee shops.

Captured fictional interfaces from the course

One intent. Three control paths.

Architecture illustration / real TestBucks screen crop

From choice to a saved order

Captured from the working practice app

A changed route. The same intent.

Captured from the isolated adaptive teaching variant

The screen says success. The record disagrees.

Captured from the isolated missing-order teaching variant

Reproduce first. Then verify the repair.

Actual search-fault toggle and normal-build comparison

Turn a vague failure into a useful observation

Captured from the isolated diagnostics teaching variant

Timeout does not mean nothing happened

Captured from the isolated mock-ledger teaching variant

Different needs change the investigation

Real app captures / persona tasks are exercise instructions

One screen. Different judgments.

Real order screenshot / illustrative judge comparison

A sign-in change reaches beyond sign-in

Captured from the isolated sign-in teaching variant

More evidence can lower confidence

Real fixture screenshots / illustrative release assessment

Separate journeys. Separate working state.

Two actual browser-session captures / orchestration plan

Plant a defect. Check the checker.

Captured missing-order fixture / harness acceptance contract

Keep the investigation on the machine

Real diagnostics capture / local architecture illustration

Personalized screen to a screenless intent

Captured teaching variant / voice transcript is simulated