FuckClaude is a bilingual web tool that checks browser-visible signals and estimates whether Claude Code might identify the environment as belonging to a China-based user. It is for people who want to inspect signals such as the system timezone and proxy hostname without sending data over the network, since the scan runs locally. The catalogue rule and skill provide agent-oriented guidance related to the tool.
Skill Claude CodeCodex
A set of rules for detecting signals that may suggest a browser user is in China. It scans browser information locally and also reuses scoring functions in a server endpoint called /api/check.