Is the Webflow MCP good enough to build full pages from a prompt?

Not reliably yet. It's excellent for structured work — CMS, SEO fixes, design tokens and style guides — but design-from-prompt page building is weak: it tends to invent a class per element instead of reusing your system, drop raw hex where variables belong, and lean on generic divs over semantic markup. Treat the canvas output as a draft to review, not a finished page.