Claude-Powered MCP Tool Generates Interactive HTML Components Without Build Tools

Architecture and Workflow

A developer has created daub.dev, a system where Claude serves as the brain of an MCP (Model Context Protocol) server that generates interactive HTML components on demand. The setup involves Claude connecting to the MCP server and calling a generate_ui tool with a natural language description of what's needed.

The tool returns a self-contained HTML+CSS+JS snippet ready to drop into any page without requiring React, a bundler, or any build pipeline.

Why Claude Works Well for This Use Case

According to the developer, Claude's instruction-following on structured tool schemas is remarkably consistent. The generate_ui tool has a tight input schema with parameters for component type, data, and style constraints, and Claude rarely hallucinates fields or ignores constraints.

With other models, the developer had to add significant defensive parsing, but with Claude the output is predictably clean. Additionally, Claude's understanding of semantic HTML is strong enough that the components it produces are accessible by default—with correct landmark roles, label associations, and keyboard navigation—without explicit instructions.

Tool Output Format

The MCP tool outputs a render_spec—a JSON object describing layout, slots, and component data—which the client hydrates into HTML. This approach is cleaner than returning raw HTML strings because it's easier to diff, cache, and update on state changes without requiring a full re-render.

The developer mentions being available to discuss the tool schema design, the render pipeline, or how the 7-stage selfCheck validation works. A playground to try the system is available at daub.dev/playground.