How to prevent false positives when LLM agents test social login flows

When LLM agents test social login or signup flows, a passing result can be misleading if the agent reuses an existing browser session, stale cookies, or a mismatched identity. The core problem is that social login carries more state than a simple email-password form, including provider sessions, redirects, consent steps, and confirmation emails. Developers are advised to treat test identities as explicit dependencies by using synthetic, short-lived references like 'identity-qa-17' in isolated staging environments rather than relying on browser state. Each step in the flow should be verified against a small contract that confirms which identity was used, what state changed, and which signals were observed. Deterministic checks at every handoff point, such as validating session freshness, redirect URIs, and domain events, are recommended to ensure agents cannot falsely assert a signup completed.