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Google’s Agent Development Kit.
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

Attaches to the agent and returns it, so it drops into an existing construction line. Takes an optional grant, which is the one adapter where authority can be bound at wrap time rather than at the call.

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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.