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Gemini, through the Google GenAI SDK.
That is the whole integration. From here every call the client makes is recorded on the open trajectory.

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What is distinctive

Function calls are read off the response and recorded individually. A response proposing three functions produces three steps, because one of them being refused is the interesting case.

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In context

The witness block opens the trajectory and closes it on exit, including when the body raises — an episode that ended badly is exactly the one worth having a record of.

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Recording without content

Shape and metadata only: model, latency, token counts, tool names. No prompt or response text. The governed facts are unchanged.
Authority is never asked for by an adapter. It stays an explicit trajectory.authorize(...) call, so importing a middleware can never become a spend decision. See authorise an action.