While agents can often infer how a form works, providing declarative WebMCP metadata makes interaction more reliable.
How the Forms missing declarative WebMCP audit works
Lighthouse identifies <form> elements that don't have both a toolname and a
tooldescription. For now, this audit is informational and does not result in
any warnings.
How to fix
Update your HTML forms to include the necessary WebMCP attributes:
<form toolname="newsletter_signup" tooldescription="Subscribes the user to the weekly newsletter">
<input name="email" type="email" toolparamdescription="The user's email address">
<button type="submit">Sign Up</button>
</form>