Claude Code mod

layer0-compose

Moves the top-priority rule list (Layer 0) from per-turn UserPromptSubmit injection into the system prompt, where prompt caching applies. The injected copy is removed only when the system prompt really carries the same text.

Guard & safety modsValidates on Claude Code 2.1.319 Source

Install

From source

git clone https://github.com/chami1221-eng/my-ai-workbench.git
claude --plugin-dir ./my-ai-workbench/mods/layer0-compose

The repo has no marketplace file, so load the plugin folder directly with --plugin-dir.

What it can access

Reach: L1Reads: reads files, reads env vars
Sees: classic hooks
Hooks: session.startprompt.composeclassic.UserPromptSubmitcommand.run

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: chami1221-eng/my-ai-workbench
Folder: mods/layer0-compose
Type: Guard & safety mods
License: Apache-2.0
Last updated: 15 October 2026
Listed in: awesome-claude-code-mods

FAQ

What is layer0-compose?

What can the layer0-compose mod access?

Its widest reach is "reads" (reads files, reads env vars). It sees classic hooks. Like any mod, it runs with your permissions.

How do I install layer0-compose?

Clone chami1221-eng/my-ai-workbench and start Claude Code with --plugin-dir pointing at the mod's folder (mods/layer0-compose).

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