I use Claude Code, Antigravity (Gemini) and Copilot most of the day, and the way I usually found out I had hit a limit was a task stopping halfway through. Each tool shows its usage somewhere (/usage in Claude Code, a settings page elsewhere), but I never look until it's too late.

So I made CotaBar, a small applet for the Cinnamon panel on Linux Mint. Each tool gets a double ring: the outer one is the long window (week or month), the inner one the short window (5 hours). Next to it are the two percentages with a letter for the period (H, D, W, M). Clicking it lists every limit with a bar and when it resets.

CotaBar on the panel with the menu open

How it gets the numbers

A Python script, standard library only, runs every few minutes. It reads the login each tool already keeps on disk and asks the same usage endpoint the tool itself uses:

  • Claude Code: ~/.claude/.credentials.json, the endpoint behind /usage
  • Antigravity: the agy CLI token, Cloud Code's quota summary
  • Codex: ~/.codex/auth.json
  • Copilot: gh auth token

Two rules I didn't want to break:

  • Never refresh a token. Refreshing Claude's or Codex's token rotates it, which would log out the session I have open. If a token is expired, CotaBar keeps the last good reading. With an expired token the tool is idle, so usage can't have gone up; it only zeroes the windows whose reset time already passed.
  • Never write a token. The applet only reads a JSON with percentages and reset times.

A small thing I found along the way: Antigravity's quota endpoint returns only one model group unless the User-Agent carries the client version. With the version it returns Gemini, Claude/GPT and Argon separately.

Install 

git clone https://github.com/Davicjc/cotabar.git cd cotabar && ./instalar.sh

It shows up on the panel without restarting Cinnamon. The menu also has an update button that pulls the latest version from GitHub.

Codex support follows the official endpoint, but I couldn't test it with a real account yet. If you use Codex, I'd love to know whether it works. The idea came from Codenotch, a macOS app that puts these limits on a notch; CotaBar is a separate implementation for the Linux panel.

Repo: https://github.com/Davicjc/cotabar