T3-R2 in five minutes

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Hosted APIs usually separate system, user, and tool messages. Confirm the current API.

The system message is not a secret from a determined user. Do not put a key there.

Tool results should be marked as tool results.

Order matters because the model reads the sequence.

Record which role said each line in the trace.

A trace that flattens every role into one paragraph hides whether the tool or the model spoke. Keep the roles.