Consent
Who approved it.
Handshake
Agent authorization infrastructure for carrying consent, intent, policy, and authority before AI agents call services, systems, devices, or other agents.
A working credential is not authority.

Ceremony
A principal can be real. A key can be valid. An endpoint can be reachable. None of that proves this action was allowed.
Who approved it.
What was approved.
What is still allowed.
What remains after it happens.