Claude Code mod

12ui

A Design workspace in Claude Code: see design options for a UI as images, select one, ask for more, ask for a change with a note and hand an option off to be built. Your agent runs the 12ui command line once per request, which draws every option at once with your own Codex sign-in.

Memory & instructions mods Plugin marketplaceValidates on Claude Code 2.1.316 Source

Install

Inside Claude Code
/plugin marketplace add just-every/12ui-claude-plugin
/plugin install 12ui@12ui

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

What it can access

Reach
L3Network: network, drives Claude, draws
Sees
mcp__plugin_12ui_12ui-workspace__design_slate_create|mcp__plugin_12ui_12ui-workspace__design_slate_show calls
Draws in
Pane
Hooks
session.starttool.callcommand.runui.closeui.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.
Claude Code docs

Details

Repository
just-every/12ui-claude-plugin
Folder
.
Marketplace
12ui
Author
12ui
Type
Memory & instructions mods
Website
12ui.com
License
MIT
Last updated
2 October 2026
Listed in
awesome-claude-code-mods

FAQ

What is 12ui?

A Design workspace in Claude Code: see design options for a UI as images, select one, ask for more, ask for a change with a note and hand an option off to be built. Your agent runs the 12ui command line once per request, which draws every option at once with your own Codex sign-in. It is a mod for Claude Code, from just-every/12ui-claude-plugin on GitHub.

What can the 12ui mod access?

Its widest reach is "network" (network, drives Claude, draws). It sees mcp__plugin_12ui_12ui-workspace__design_slate_create|mcp__plugin_12ui_12ui-workspace__design_slate_show calls. It draws in Pane. Like any mod, it runs with your permissions.

How do I install 12ui?

Inside Claude Code (v2.1.287 or later), run /plugin marketplace add just-every/12ui-claude-plugin and then /plugin install 12ui@12ui.

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