Auto-filling Chouseisan attendance with Playwright, deciding answers via Claude Code's Google Calendar MCP
This article was co-authored with a generative AI. Facts have been cross-checked against official documentation where possible, but errors may remain. Please verify primary sources before making any important decisions. Chouseisan (調整さん) is a popular Japanese scheduling tool — but it has no public API, and entering attendance for events with 40+ candidate slots gets tedious. So I built a small CLI that automates the entry with Playwright. The decision part — figuring out which slots are ◯ / △ / × based on my Google Calendar — is delegated to Claude Code via the claude.ai Google Calendar MCP. ...