Development
Hook
Hooks
What permafrost runs automatically, and when. A hook is a command Claude Code fires at a fixed moment, without you asking for it.
Install
$ npx -y skills add jianzhichun/permafrost --agent claude-codeShips with permafrost. Installing the plugin gets these hooks.
What fires, and when
SessionStart
Fires once when a session begins, and again after a context compaction. It is where a plugin sets up its environment, or restores state the compaction dropped.
- Runs session_start.sh.
Where it lives
- hooks/session_start.shGitHub
Read the script before you install anything that runs on your machine. This is the one part of a plugin that acts without being asked.
Ships withpermafrost
Freeze Claude Code's prompt prefix so DeepSeek's automatic cache always hits — alignment proxy + coalescing + keepalive, installable as a CC plugin. Measured 64% cheaper on real Claude Code traffic.
Get the whole plugin, auto-invoked