No. WebMCP should not be mechanically added to every form.
The right first step is to identify actions that truly deserve structured exposure: diagnostic request, booking, add to cart, quote request, registration or another repeatable and well-bounded action.
Before WebMCP, the basics must already be fixed: form title, labels, name attributes, error messages, confirmation, CTA and consequence. If those elements are unclear, WebMCP may only expose a poorly defined action.
The WebMCP and agent-friendly forms audit exists to decide where WebMCP is useful, premature or unnecessary.