Overview
Direct requests can be rate-limited, throttled, blocked, or changed. Browser automation can break when page structure changes and may be slower than a human for simple actions. Computer automation can consume substantial tokens and take a long time to recover from small mistakes.
Authentication and sensitive data increase risk at every layer. A direct script can act at high volume. A browser agent can submit real forms or messages. A computer-control agent can affect local files and applications. Permissions and verification should match the consequences of the action.
Automation may also violate a platform's terms of service. The fact that an agent can perform an action does not establish that the action is permitted. Operational design must account for the rules of the systems being accessed.