WebSketch

About

WebSketch is an MCP server designed to empower Large Language Model (LLM) agents with the ability to understand and interact with user interface (UI) structures using the WebSketch IR (Intermediate Representation). It provides a suite of specialized tools, enabling agents to validate UI captures for correctness, render them into descriptive ASCII wireframes, compute structural differences between UI states, and generate unique, deterministic fingerprints for UI elements. This allows LLMs to effectively interpret, compare, and reason about UI designs and layouts programmatically.

Key Features

• Preflight validation of WebSketch IR captures to ensure correctness
• Compute structural differences between two WebSketch IR captures
• Render WebSketch IR captures into human-readable ASCII wireframes
• Generate deterministic fingerprints for UI captures for identification and comparison
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Use Cases

• Integrating LLM agents (e.g., via Claude Desktop) with UI analysis capabilities for design review or automated UI interaction.
• Programmatic validation and rendering of UI structures within Node.js applications.
• Automated testing and comparison of UI states by LLM agents during development workflows.