Cachebeat is a Claude Code skill that pings an idle session to keep the prompt cache from expiring
GitHub / ARahim3 (via r/ClaudeAI, 93 upvotes)·low signal
ARahim3/cachebeat (created September 14, pushed September 15, 15 stars) addresses a specific and expensive failure mode: leave a Claude Code session idle past the cache window and your next message re-reads the entire conversation uncached, which on a long tool-heavy session can be hundreds of thousands of tokens. It keeps the cache warm during idle. The r/ClaudeAI thread (93 upvotes, 25 comments) landed the same day as the usage-limit backlash, which is presumably why it caught.