Agent tooling vs SaaS integrations
SaaS integrations assume a user session. Agent tooling assumes a non-human principal with scope and caps.
OAuth for a human dashboard and a tool call from an overnight agent are different problems. Reusing the human path often drops audit and rotation on the floor.
Design for the principal
If the caller is an agent, give it an agent identity, a scoped key, and a meter. Do not borrow a user cookie.
Match the integration to the caller.