Plugin

pencil-dev-skill

Teaches AI coding tools to design and edit pencil.dev UI files (.pen format) through the Pencil MCP server. Every read and write goes through the MCP for schema validation. Live screenshots show the design as it looks, and the MCP keeps your changes and the editor in sync while the canvas is open. Recognises pencil.dev signals automatically: mentions of .pen, .lib.pen, the Pencil canvas, or a design-system folder all activate the skill. Works with Claude Code, Codex, Gemini CLI, Copilot CLI, and Cursor. Supports designing screens from scratch, editing existing canvases, instantiating components from .lib.pen libraries, customising design tokens, and bulk-replacing properties across a project.

• Published source
• Repository

Analysed

12 October 2026

Last observed

12 October 2026

What the code does

• Runs shell commands Code that starts system commands on the machine it runs on.
• Refers to credential files Code that names files such as SSH keys or cloud credentials.
• Downloads and runs code Code that fetches a script and pipes it into a shell.

Having a capability is not wrongdoing; many tools need these to do their job. It tells you what to check before you install.

This is public metadata, not a safety certification or complete assessment. Static analysis cannot establish what a tool does at runtime.