Cachebeat pings an idle Claude Code session to keep the prompt cache warm.

ARahim3/cachebeat, created September 14, addresses one specific expensive failure: leave a session idle past the cache window and your next message re-reads the entire conversation uncached, which on a long tool-heavy session is hundreds of thousands of tokens. 93 upvotes on r/ClaudeAI the same day as the usage-limit complaints, which is presumably why it caught. Small, obvious in hindsight, and I'm surprised it took this long.