fix: refuse a tool confirmation from a sender the transport did not authenticate - #1512
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…uthenticate An agent exposed over A2A could have a dangerous tool call approved by the calling peer itself, because the peer's own message reaches the flow authored as `user`. Confirmations now pass through `ConfirmationApprover`, whose default `REJECT_UNAUTHENTICATED` refuses a sender the transport saw and did not authenticate. PiperOrigin-RevId: 977623371
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fix: refuse a tool confirmation from a sender the transport did not authenticate
An agent exposed over A2A could have a dangerous tool call approved by the calling peer itself,
because the peer's own message reaches the flow authored as
user. Confirmations now pass throughConfirmationApprover, whose defaultREJECT_UNAUTHENTICATEDrefuses a sender the transport sawand did not authenticate.