Pomodoro Timer
Focus timer with work and break cycles and session counts.
What it adds
Build a Pomodoro timer with configurable work and break lengths, cycle tracking, and gentle alerts.
What your builder is told to do
4
What your builder is told to do
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1
Inspect any default durations or cycle rules in the source files.
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Create controls for work length, break length, and long-break interval.
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Run accurate countdowns with start, pause, reset, and cycle counting.
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Add an accessible completion alert and a tab-title timer.
Edge cases it handles
5
Edge cases it handles
5- Keep the tool focused on one primary job. If the source asks for a suite, build the first usable tool and list the obvious follow-ups.
- Do not invent testimonials, guarantees, legal disclaimers, revenue numbers, scarcity, or unverifiable claims.
- If formulas, scoring weights, or recommendation rules are missing, create editable placeholders and call out the assumptions.
- If payment, email, analytics, CRM, or storage integrations are missing, build clear seams and document the variables or endpoints still needed.
- Match the existing app or page design system unless the user explicitly asks for a standalone visual direction.
Definition of done
5
Definition of done
5- The tool is buildable as a standalone page, lightweight SPA, embeddable widget, or cleanly integrated app screen.
- The primary input, primary output, and primary action are obvious without extra instructions.
- The implementation includes empty, loading, error, and completed states.
- Mobile, tablet, and desktop layouts are accounted for.
- The agent reports the source files used, assumptions made, and any formulas or rules that still need owner review.
Related tool files
Countdown Widget
Countdown Widget
Add a clear countdown for launches, events, deadlines, or offer windows.
What it does
Build a countdown widget with accurate timing, expired state, timezone handling, and embed-friendly styling.
How it works
- 1 Inspect deadline, timezone, event copy, offer state, and what happens after expiry.
- 2 Build a countdown with days, hours, minutes, seconds, and accessible live update behavior.
- 3 Add expired, not-yet-started, and missing-date states.
Copy the prompt
No account needed
Build this as a complete, standalone tool. Read the blueprint first and follow it exactly — make it responsive, handle empty and error states, and keep it production-ready:
https://buildthistool.com/x/countdown-widget
Event Availability Clock
Event Availability Clock
Show whether something is open or available right now by schedule.
What it does
Build an availability clock that reads a weekly schedule and shows open, closing-soon, or closed states.
How it works
- 1 Inspect the weekly schedule, timezone, and holiday rules in the source files.
- 2 Create an editable schedule and compute the current open or closed state.
- 3 Show next-open or closing-soon messaging with timezone and DST handling.
Copy the prompt
No account needed
Build this as a complete, standalone tool. Read the blueprint first and follow it exactly — make it responsive, handle empty and error states, and keep it production-ready:
https://buildthistool.com/x/event-availability-clock
Flash Sale Timer
Flash Sale Timer
Urgency countdown for a sale with an expired-state fallback.
What it does
Build a flash sale timer that counts down to a deadline and swaps to an expired state cleanly.
How it works
- 1 Inspect the deadline, timezone, and post-expiry behavior in the source files.
- 2 Build a countdown with days, hours, minutes, and seconds and accessible live updates.
- 3 Add expired, not-yet-started, and missing-date states.
Copy the prompt
No account needed
Build this as a complete, standalone tool. Read the blueprint first and follow it exactly — make it responsive, handle empty and error states, and keep it production-ready:
https://buildthistool.com/x/flash-sale-timer
How it works
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1
Copy the link
Grab the Markdown blueprint URL for this tool type.
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2
Give it to your builder
Paste it into Claude Code, Cursor, Codex, or whatever AI builder is already working in your app.
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3
It maps, then builds
Your agent reads the blueprint first, then builds the tool into your app around the rules, audience, and stack.
Works with your stack
These blueprints are written to adapt. They tell the agent to detect your framework, match your existing design system, and use your source files instead of guessing the tool rules.
Need it tighter than that? Customize the tool file and tell it exactly which source docs and stack to use.