Claude Code mod

lossless-compact

Lossless compaction for Claude Code: nothing is summarized; everything removed is archived verbatim with provenance and restorable by id (Jev or a local ruleset). /lossless to inspect and restore.

2 starsWorkflow mods Plugin marketplaceValidates on Claude Code 2.1.316 Source

Install

Inside Claude Code

/plugin marketplace add MusicStudioNYC/lossless-compact
/plugin install lossless-compact@lossless-compact

Mods install like plugins. Run /reload-plugins or start a new session to load it.

What it can access

Reach: L3Network: network, writes files, drives Claude, reads files, reads env vars, reads settings, reads the transcript, persists state, draws
Sees: every skill, compaction, every prompt
Hooks: session.startcommand.runskill.promptsession.compactprompt.submitturn.complete

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.

Claude Code docs

Details

Repository: MusicStudioNYC/lossless-compact
Folder: .
Marketplace: lossless-compact
Type: Workflow mods
License: MIT
Last updated: 21 October 2026
Listed in: awesome-claude-code-mods

FAQ

What is lossless-compact?

Lossless compaction for Claude Code: nothing is summarized; everything removed is archived verbatim with provenance and restorable by id (Jev or a local ruleset). /lossless to inspect and restore. It is a mod for Claude Code, from MusicStudioNYC/lossless-compact on GitHub.

What can the lossless-compact mod access?

Its widest reach is "network" (network, writes files, drives Claude, reads files, reads env vars, reads settings, reads the transcript, persists state, draws). It sees every skill, compaction, every prompt. Like any mod, it runs with your permissions.

How do I install lossless-compact?

Inside Claude Code (v2.1.287 or later), run /plugin marketplace add MusicStudioNYC/lossless-compact and then /plugin install lossless-compact@lossless-compact.

Is lossless-compact popular?

MusicStudioNYC/lossless-compact has 2 GitHub stars and 0 forks, and is included in 1 curated Claude Code list. It was last updated on 21 October 2026.

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