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Measured in real ptys before taking the obvious alternative. A tri-state on DECSET 2004 (observed-on / observed-off / never-observed) does not work: zsh 5.9, fish 4.8.1 and bash >= 5.1 announce and withdraw the mode cleanly, but macOS /bin/bash 3.2, /bin/sh, bash 4.4 and any shell with bracketed paste disabled emit nothing at all, byte-identical to a bare `cat`. Silence cannot be read as consent. Agent identity disambiguates it in the one direction that matters: agents always enable the mode, so silence on an agent pane means the announcement was lost in transit, never an opt-out. Also measured: bracketing a program that never negotiated is worse than useless - the markers land as literal payload bytes and ICRNL still turns the CR into a submit - so the gate stays narrow. Refs STA-4294