Terms and limitations
A useful second opinion, not an absolute guarantee.
Percival is designed to support responsible decisions, but it does not prove that a message is safe and it should not be your only control.
Percival helps users review suspicious emails, but it cannot guarantee that any message is safe, genuine or risk-free.
A likely safe or low-risk result is not proof. Users should still verify unexpected requests independently.
False positives and false negatives can happen, particularly when the available evidence is incomplete.
Percival should not be treated as legal advice, a final security verdict or a replacement for broader security controls.
For urgent or high-impact situations, contact the relevant organisation, bank, service provider or internal security team directly using trusted contact details.