Show HN: Claude-thermos – keeps your Claude session warm for you
Claude-thermos is a new tool designed to prevent Claude Code's prompt cache from expiring during long sessions. By keeping the cache warm, it avoids costly re-encoding fees that occur when subagents cause the main agent's cache to time out.
Stop paying to rebuild your Claude Code cache. When your main agent waits on a subagent for more than 5 minutes, its prompt cache silently expires, and the next turn re-encodes your entire conversation at the write rate instead of reading it back cheap. On long sessions with many subagents that's roughly 20% of your bill. claude-thermos keeps the cache warm so you never pay that tax.
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