It says it makes:

- a CLAUDE.md file when Claude CLI is detected (disable with CLAUDE_CODE_AGENT_RULE_DISABLED env var) - a .cursor/rules/*.mdc file when Cursor is detected, which tells Cursor AI to use Bun instead of Node.js and npm

Is it by default if it only does it when you have the tools installed?

It is default behavior based on implicit environment setup. But I think the title could use updating because it is misleading without that.

Perhaps "creates CLAUDE.md for claude-code users by default" instead.