No Fi

No Fi is an agent skill that draws UI wireframes as plain text with a built-in linter.

No Fi is an agent skill that draws UI wireframes as plain text so teams argue about layout, content, and flow instead of color and type. Ask for a screen and Claude answers with a monospaced drawing using boxes, fields, buttons, tables, and bar charts made from plain characters. The skill includes 44 elements in seven groups such as structure, fields, buttons, feedback, navigation, data, and charts. It features a linter script in Node and Python that checks every wireframe before display and fails on unsupported characters, misalignment, and broken boxes. It is designed for developers and designers who want to plan screens with AI agents using text-based interfaces.

No Fi at a glance

Best for: Software engineer, Designer
Runs on: Web, CLI, Node, Python, open source
Pricing: Free
Released: October 2026
Category: AI coding tool
Website: github.com/p-a-u-l-i-e/no-fi

Key features

Draws UI wireframes as plain text
Uses a 44-element vocabulary
Validates wireframes with a checker script
Outputs fenced code blocks for alignment
Describes visuals in notes below drawings
Includes node and python checker scripts

Use it for

Wireframe a send-money form
Draw notification preference settings
Design a transactions table
Plan UI layouts with AI agents

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