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A seat in the composer tool row, left of the model select, showing the preset THIS session runs — its own recorded one, not the deployment default, because a resumed session runs what it was created with. `SessionSummary` carries `agentPreset` for that, alongside `cwd` and `origin`. The switch exists only while the conversation has not started. After the first turn the seat becomes a plain label rather than a disabled menu: a greyed control reads as "temporarily unavailable", when in fact the choice is gone for good. The seat never asks in that state, and the host refuses independently with `agent-preset-locked`, so a stale client cannot slip one past it. A rejected switch restores the previous value and surfaces the host's message rather than leaving the seat showing something the session is not running.