+ Pencil × your AI agent Edit a design from chat
If you ask
“In my hero.pen file, change the headline to 'Ship faster' and bump it to 64px”
Then
Modify an existing .pen file through natural language while staying in chat.
Works in Claude, Codex, Cursor & any MCP agent
How this prompt works
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Turn on the Pencil connector in Claude, ChatGPT or Cursor — once.
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Paste the prompt above. No code, no menus.
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Modify an existing .pen file through natural language while staying in chat.
FAQ
How do I edit a design from chat with Pencil?
Add the Pencil MCP connector once, then paste this prompt into Claude or ChatGPT: "In my hero.pen file, change the headline to 'Ship faster' and bump it to 64px". Your AI runs it in Pencil.
Do I need to code?
No. You install the connector once (a short config or one click), then ask in plain words. The prompt on this page works as-is.
Which AI assistants work?
Claude (Desktop, Code), Cursor, ChatGPT and other MCP clients. The same prompt works across them.
Set up Pencil in Claude
Copy-paste config, setup steps and more ready-to-run prompts on the connector page.
Open Pencil setupMore prompts