Member Junction
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    RealtimeContextErrorCode:
        | "unknown_channel"
        | "channel_not_open"
        | "unknown_instance"
        | "unknown_verb"
        | "not_invokable_by_agent"
        | "invalid_params"
        | "open_failed"
        | "exposure_restricted"
        | "verb_failed"

    Why a targeted ContextTool call was refused. Each code maps to a message that tells the model how to recover, so it can correct itself conversationally instead of going quiet.