Claude to build a local family ending note
Tax accountant Tamaki wanted a family ending note that could hold more than a list of assets. Using Claude Code, the nonengineer built a web app in roughly half a day to record family information, medical and funeral wishes, and material for thinking about inheritance and asset division.
note.com
Original prompt
Shared by the source author. See source notes for context.
全部を1枚のHTMLファイルに詰め込んで、ダブルクリックで開くだけで動くようにできる？
Reach people exploring AI agents
See placements →Evidence at a glance
Sourced account- Source author
- 税理士たまき (@m_tamaki)
- Original account
- Read the source ↗
- Published
- Source link checked
- Reported result
- A local-storage ending-note app and a single-file offline HTML version with allocation warnings.
- Human involvement
- Tamaki guided the build and checked an official example; no independently validated estate decision is reported.
A linked account supports attribution. It does not mean we independently reproduced its result.
Report an issue with this case
Open correction emailOpens your email app with the case link included. Nothing is sent automatically.
How the agent did it
- Define family records, wishes and allocation controls.
- Build the browser app with local storage and allocation warnings.
- Check example calculations and export one offline HTML file.
Tax accountant Tamaki wanted a family ending note that could hold more than a list of assets. Using Claude Code, the nonengineer built a web app in roughly half a day to record family information, medical and funeral wishes, and material for thinking about inheritance and asset division.
The app used React, TypeScript and Vite, with records stored through the browser's localStorage. It included an inheritance estimate and division-fraction simulation. Allocation controls offered equal, statutory and remainder-based approaches, while warnings highlighted unassigned shares or totals above one hundred percent.
Tamaki checked calculations against a published National Tax Agency example involving a hundred-million-yen estate, a spouse and two children. That is a reported self-check, rather than independent validation of a legal or tax calculator. The source does not describe this app filing an inheritance return or settling a family's estate.
A particularly practical request was to package the app as one HTML file with its JavaScript and styles included. That produced an offline artifact which could open by double-clicking and be shared on a USB drive. Local record storage describes the app's architecture; it does not establish what information was sent to the coding model during development. The case is useful as a portable family-record organizer, with calculation checks and legal decisions remaining separate responsibilities.
Prompt
Original prompt
Source: note.com · 税理士たまき (@m_tamaki)
Frequently asked questions
Can it work without a hosted server?
The author produced a single HTML file that opens locally.
What catches incomplete allocations?
Warnings identify unassigned shares and totals above one hundred percent.
Were the tax calculations independently validated?
No. Tamaki reports checking a published example, not external certification.
More details
About this account
Claude Code built the app and packaged its code into a portable HTML file.
Firsthand source opened and read. Prompt is a verbatim excerpt of the published original instruction.
Credit: 税理士たまき (@m_tamaki)
Source published
Added to Agents In Use
Source checked
Tools and topics
Claude Code · React · TypeScript · Vite · localStorage · HTML
Ending notes · Family wishes · Estate records
Editorial completeness: 100/100. Measures documented fields, not agent performance or verified outcomes.