Claude Code mod
vellum
Plan at the frontiers and review the plan in the browser: decisions and interfaces before mechanics, vertical slices each closed by a check. /vellum:start opens a planning mode of its own: Claude writes the plan and its mockups and grills the reviewer on the open choices; the reviewer comments, edits or approves in a page, and the answer reaches Claude as a prompt.
Install
git clone https://github.com/bengous/claude-code-plugins.git
claude --plugin-dir ./claude-code-plugins/vellumThe repo has no marketplace file, so load the plugin folder directly with --plugin-dir.
What it can access
- Reach
- L3Network: network, runs processes, sets env vars, drives Claude, reads files, reads env vars, persists state, draws
- Sees
- the vellum:start skill, the vellum:stop skill, mcp__vellum__submit calls, mcp__vellum__state calls, mcp__vellum__grill_ask|mcp__vellum__propose|AskUserQuestion calls, every prompt
- Draws in
AbovePrompt- Hooks
session.startskill.promptcommand.runui.rendertool.checktool.callprompt.submitsession.appendturn.startturn.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.
Details
- Repository
- bengous/claude-code-plugins
- Folder
vellum- Author
- Augustin BENGOLEA
- License
- MIT
- Last updated
- 1 November 2026
- Listed in
- awesome-claude-code-mods
FAQ
What is vellum?
Plan at the frontiers and review the plan in the browser: decisions and interfaces before mechanics, vertical slices each closed by a check. /vellum:start opens a planning mode of its own: Claude writes the plan and its mockups and grills the reviewer on the open choices; the reviewer comments, edits or approves in a page, and the answer reaches Claude as a prompt. It is a mod for Claude Code, from bengous/claude-code-plugins on GitHub.
What can the vellum mod access?
Its widest reach is "network" (network, runs processes, sets env vars, drives Claude, reads files, reads env vars, persists state, draws). It sees the vellum:start skill, the vellum:stop skill, mcp__vellum__submit calls, mcp__vellum__state calls, mcp__vellum__grill_ask|mcp__vellum__propose|AskUserQuestion calls, every prompt. It draws in AbovePrompt. Like any mod, it runs with your permissions.
How do I install vellum?
Clone bengous/claude-code-plugins and start Claude Code with --plugin-dir pointing at the mod's folder (vellum).
Is vellum popular?
bengous/claude-code-plugins has 6 GitHub stars and 0 forks, and is included in 1 curated Claude Code list. It was last updated on 1 November 2026.
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