cursor-bridge runs Claude Code CLI off a Cursor subscription, and the README is the whole story.

A Rust local HTTP proxy that translates Anthropic API calls into Cursor agent CLI invocations, reading your Cursor auth token from the macOS keychain and spawning Claude Code with proxy env vars set. MIT, 37 stars, 2 commits. It disclaims affiliation with both Anthropic and Anysphere and says "use at your own risk" without addressing either vendor's terms of service. Interesting as a signal about where people think the arbitrage is; I wouldn't run it. (GitHub)