AgentMail webhook creation can look done after a 200 OK. The real test is whether the persisted webhook is still scoped to the inboxes you sent.
The dangerous AgentMail webhook bug starts with a response that looks completely fine.
POST /v0/webhooks -> 200 OK
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The response body contains the webhook object. It includes your URL, event types, and usually enough fields to make the integration feel done.
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