Claude Code mod
haiku-compact
Squish your context with Haiku when the prompt cache goes cold, so your main model re-caches a short summary instead of the whole transcript. One line above the prompt shows up only when the cache is cold, says what a squish saves, then what it saved.
Install
/plugin marketplace add kjhq/haiku-compact
/plugin install haiku-compact@haiku-compactMods install like plugins. Run /reload-plugins or start a new session to load it.
What it can access
- Reach
- L2Writes or runs: drives Claude, writes the prompt box, reads mod state, draws
- Sees
- classic hooks, every prompt, compaction
- Draws in
AbovePrompt- Hooks
classic.SessionStartturn.startturn.completeprompt.submitsession.compactui.render
From a static scan of the mod's code by awesome-claude-code-mods. It shows what the code asks for, not a security review.
How Claude Code mods work
- A mod is a plugin with a JavaScript or TypeScript module that runs inside Claude Code (version 2.1.287 or later). It can draw panes beside the transcript, a band above the prompt, buttons and toasts, restyle the spinner and tool rows, and watch or rewrite tool calls and prompts.
- It installs like any plugin: add its marketplace with /plugin marketplace add owner/repo, then /plugin install name@marketplace.
- Check what a mod can reach before installing: it runs with your permissions. Reach goes from drawing only, to reading files, to writing files or running processes, to the network. Run claude plugin validate on a clone to list its hooks and calls without running it.
- Turn one off from the Installed tab in /plugin, or start Claude Code with --safe-mode to skip every customization for a session.
Details
- Repository
- kjhq/haiku-compact
- Folder
.- Marketplace
haiku-compact- Author
- kjhq
- License
- MIT
- Last updated
- 10 October 2026
- Listed in
- awesome-claude-code-mods
FAQ
What is haiku-compact?
Squish your context with Haiku when the prompt cache goes cold, so your main model re-caches a short summary instead of the whole transcript. One line above the prompt shows up only when the cache is cold, says what a squish saves, then what it saved. It is a mod for Claude Code, from kjhq/haiku-compact on GitHub.
What can the haiku-compact mod access?
Its widest reach is "writes or runs" (drives Claude, writes the prompt box, reads mod state, draws). It sees classic hooks, every prompt, compaction. It draws in AbovePrompt. Like any mod, it runs with your permissions.
How do I install haiku-compact?
Inside Claude Code (v2.1.287 or later), run /plugin marketplace add kjhq/haiku-compact and then /plugin install haiku-compact@haiku-compact.
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