A browser extension with broad host permissions.
Not an agent by name, and it has a grant: an extension granted 'read and change all your data on all websites' reads every page you visit, reaches any host, and acts inside the sites you are logged into. Nobody wrote it a mandate. This is the template vault for that shape: the grant derived from what the shape architecturally is and from published documentation, the starting mandate the model site published, and everything else derived. Every number on this page is decrypted from the vault as you read it.