2 min lesson
Walkthrough: Plan Mode — compose the prompt, live the outcome
Complete "Walkthrough: Plan Mode, compose the prompt, live the outcome". Check the final state against the lesson before you move on.
Check your understanding
Complete this walkthrough: Plan Mode — compose the prompt, live the outcome.
Outcome: Finish with the result shown in the final walkthrough step.
Plan Mode — compose the prompt, live the outcome
Agent in Plan Mode, codebase indexed
3 steps · ~2 min
Compose the prompt → Send it → Check the blast radius
Read this walkthrough as text
Plan Mode — compose the prompt, live the outcome
Agent in Plan Mode, codebase indexed
SayAdd a recent-searches list under the search box — show the last 5 queries. Work only in components/search, and leave the filter logic alone.
SeePlanned as prose and built in one pass — no gate, no dangling question. The files card stops at three, every file inside components/search: exactly the size of the prompt.
DoCheck the blast radiusHow much breaks if a change goes wrong; the scope of potential damage. Press Enter for the full definition. — open the files-changed card.
SeesearchFilter.ts isn't in it. The boundary you wrote is the boundary that shipped.
SayNow the vague version: "Add recent searches to the app."
SeeWith no scope and no gate, the sprawl SHIPS — four files, including a searchFilter.ts rework that touches every caller and that nobody asked for.
DoRoll it back with the ↺ on your prompt, then send the tight version it staged for you.
SeeThe same three-file build the tight prompt buys first time — you just paid a rollback to get there. With no gate between plan and build, the prompt IS the review.
Simulated Cursor 3.12 (macOS, light) — beta educational reconstruction, not the real product.
Learn more
Optional practice
Practice: Walkthrough: Plan Mode — compose the prompt, live the outcome
QYou've applied it. What actually proves the work is done, not just a plausible answer?