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The ZIP contains the whole prototype. Attach it to Claude Code or Codex and ask: "Can you build an app like this?"
The ZIP is MIT licensed: free to modify, use for work and redistribute. No warranty.
Who it's forAdults who get into bed but can't fall asleep because tomorrow's tasks and worries keep going round in their heads
Save It for Lunch (book bedtime worries into tomorrow's 15-minute worry slot)
Published Nov 9, 2026 (Mon)
The problem
You're sleepy, but your mind won't stop, and before you know it it's the middle of the night. Start looking things up on your phone and you end up even more awake.
What it does
- Type a worry in one line and it's booked, with a time, into tomorrow's 15-minute worry time (12:30–12:45), and the screen dims a step
- Type the same worry in other words and you only get an "Already booked 12:35" tag, no new slot ("Something else" fixes a wrong match)
- "That's it for tonight" closes the screen dark, showing only what you booked
Research report (hypothesis validation)
Before building, we wrote down 5 hypotheses and checked them against news reports and official pages. Validated 2 · Partly / with conditions 3 · Invalidated 0. Read the research report
How this prototype was made
- IdeaGrok analyzed posts on X where people described a problem
- PlanningClaude ×Codex Claude and Codex each came up with three ideas separately, and Claude merged them
Claude Opus 5.5 / Codex(GPT-6 Astra) - Built byClaude Code (Claude Opus 5.5)
Stage
- Hands-on prototypeYes (made-up data; the prototype itself makes no network calls)
- Tested in real workNo
The English version is an AI translation of the Japanese original. The scenarios are set in Japan, and all names and data are made up.
Download this prototype as a ZIP and hand it to Claude Code (or Codex). It can build the real tool on top of it.
Each ZIP contains the working prototype, a manual, and builder-handoff.md: who it is for, what was checked, and the decisions to make before it touches real data. Attach the folder and say, for example: "Build a working version of this for my shop. Before you start, go through 'Decisions before making it real' with me."
Give this prototype’s ZIP to kote2 Builder AI OS and say "Continue building this prototype", and it can start from the prototype as its draft.
kote2 Builder AI OS is a tool for building things by chatting with Claude Code or Codex. It makes prototypes and shapes them together with you. Ask in English and it answers in English.