Claude Code mod
ultracompress
Deterministic local compaction for Claude Code: replaces the stock compaction summarizer with the local UltraCompress binary (no model call, no API cost per compaction) and serves a recall tool over the raw session transcript.
Install
git clone https://github.com/michael-berardi/ultracompress.git
claude --plugin-dir ./ultracompress/claude-codeThe repo has no marketplace file, so load the plugin folder directly with --plugin-dir.
What it can access
- Reach
- L2Writes or runs: runs processes, drives Claude, reads files, reads env vars, draws
- Sees
- compaction, ? calls
- Hooks
session.compactsession.starttool.call
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
- michael-berardi/ultracompress
- Folder
claude-code- Author
- Michael Berardi
- License
- MIT
- Last updated
- 16 October 2026
- Listed in
- awesome-claude-code-mods
FAQ
What is ultracompress?
Deterministic local compaction for Claude Code: replaces the stock compaction summarizer with the local UltraCompress binary (no model call, no API cost per compaction) and serves a recall tool over the raw session transcript. It is a mod for Claude Code, from michael-berardi/ultracompress on GitHub.
What can the ultracompress mod access?
Its widest reach is "writes or runs" (runs processes, drives Claude, reads files, reads env vars, draws). It sees compaction, ? calls. Like any mod, it runs with your permissions.
How do I install ultracompress?
Clone michael-berardi/ultracompress and start Claude Code with --plugin-dir pointing at the mod's folder (claude-code).
Is ultracompress popular?
michael-berardi/ultracompress has 3 GitHub stars and 0 forks, and is included in 1 curated Claude Code list. It was last updated on 16 October 2026.
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