Read one message
The message, rendered for reading and structured for parsing.
provenance reports what authentication the message arrived with and
what was removed from it. Read it before treating the content as
trustworthy: a message that failed authentication is placed and
rendered like any other, and the verdict is the only thing that says
so.
Authorizations
Bearer credential for one agent: an API key or an access
token (a JWT). Pass as Authorization: Bearer <credential>.
A key is shown once when it is issued and is not recoverable afterwards; an access token lives five minutes and is fetched with the agent's own client key from the access service. Treat both as secrets: they reach one agent's mail, and anything a delegation has extended to it. An access token's scope is a ceiling on what the agent may do with it.
Body
Response
The object.

