Claude Usage Tracker — lugia19

This extension is meant to help you gauge how much usage of claude you have left, based on the tokens consumed by your messages.

The extension will correctly handle calculating token usage (via gpt-tokenizer) from:
- Files uploaded to the chat
- Project (knowledge files and instructions)
- Personal preferences
- Message history
- The system prompt of any enabled tools (analysis tool, artifacts) on a per-chat basis
- The AI's output (This is weighted as being 10x the usage of input tokens, a rough estimate)

It uses your organization ID on claude.ai to synchronize your usage amounts across devices via firebase.

About the required permissions:
Host Permissions:
- Claude.ai: Needed to read the tokens and usage amounts.
- Github: Needed to fetch the up to date usage caps and settings from the repo.

Actual permissions:
- Tabs: To send updates from the background script to the content scripts
- Storage: To store and track usage amounts
- Alarms: To periodically sync with firebase, and check for the cap reset
- Cookies: To get the sessionKey required to fetch conversation content (This is never stored, not even locally, just used temporarily - blame MV3 for this being required)
- webRequest: To detect when a new message is sent, or data recieved

Source code here: https://github.com/lugia19/Claude-Usage-Extension