Your agent says it sent the proposal. The tool call came back with an id. The trace shows a green step. The customer never got the email. I've seen versions of this enough times that I no longer trust a success response on its own. Here's why, and what I check instead. Success responses mean "accepted", not "done" Most APIs tell you they received your request. They don't tell you the end result. A mail API returns an id when the message is accepted. That's not the same...