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Separate the audio loop from consequential state changes. Partial transcripts can change as more speech arrives. Use stable interpretations and appropriate confirmation before actions that affect records, accounts, or other people. Measure end-to-end delay, including endpoint detection, recognition, retrieval, tool execution, and audio playback. A low model response time does not establish a low conversational delay if another stage dominates. Handle interruption and cancellation across the whole pipeline. Stopping speech playback does not necessarily cancel an already dispatched tool operation. Track action state explicitly and reconcile uncertain outcomes before retrying. Test adverse conditions: silence, overlapping speakers, dropped connections, ambiguous names, and late tool results. Provide a usable handoff and an honest status when a task cannot be completed. Protect recordings and transcripts according to the actual access and retention policy.