Classmethod says Claude Code made its developers up to 10 times faster
In plain words
Japanese IT services firm Classmethod uses Claude Code across engineering and business tasks, including Google Apps Script automations.
What happened: Up to 10 times more output and 90% less time coding. One task went from 24 hours to 1 hour.
Source: claude.com ↗
How to do it yourself
Our suggested steps. The company didn't publish theirs.
- 1
Write down a spreadsheet chore you do by hand every week.
- 2
Ask Claude with the prompt below to write an Apps Script for it.
- 3
Paste the script into Extensions > Apps Script and run on a copy of the sheet.
- 4
Fix any errors by pasting them back to Claude.
- 5
Add a time-based trigger so it runs automatically.
The instructions to give the AI
Paste this into Claude (the free plan is fine), swap the [brackets] for your details, and test it on a few real examples.
This is one part of the setup. It won't connect to your phone, inbox or other apps on its own; the steps above cover that.
Agent instructions (prompt)
Write a Google Apps Script for this sheet: [describe columns]. It should [task, e.g. email each overdue customer, move paid rows to 'Archive', build a weekly summary tab]. Include comments, a dry-run mode, and instructions to add a weekly trigger.
[Highlighted] = replace with your own details before you run it.
What you should get back: A ready-to-paste Apps Script that, for example, emails every overdue customer and archives paid rows.
Written by Quickly and Good, inspired by this case.
More detail: tools, prices and what you'll need
The company used: Claude Code
You could use: Claude Code (or Claude.ai) to write Google Apps Script
- Claude Code
AI coding agent that builds and edits software from plain-English instructions.
See pricing · Official site ↗
- Claude
AI assistant for writing, analysis and long documents; can connect to your tools.
Free plan; Pro $20/mo (monthly) · Official site ↗
Prices from each tool's own pricing page, checked Oct 2026.
What you'll need
- ☐A developer environment and the coding agent (e.g. Claude Code)
- ☐API access to the systems it must touch
- ☐Clear written instructions and project rules
- ☐Version control and a way to undo changes
- ☐Testing and code review by someone who can read the code
Can I do this myself?
Only if you can code or are learning to. Otherwise hire a builder.
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