A tool that watches your usage has to be specific about what it looks at, because “we respect your privacy” is not a claim anyone can check. This page is the list.
A single 1-token API call every five minutes — the rate-limit reading, which is the one thing that cannot be computed locally. That is all. There is no account to create, no telemetry endpoint, and nothing to log into: the app reuses the OAuth token Claude Code already stored, and never writes to a configuration folder.
Sizes, names, timestamps and frontmatter from ~/.claude — never the contents of your memories, instructions or skills — and it never edits them. The one action it offers is copying a cleanup prompt for Claude Code to act on.
Account holder, email and absolute paths are masked until you ask for them, because System information is the page that ends up in a screenshot. Copy for a bug report copies the page exactly as shown, so a masked holder stays masked.