Use to correlate this with [codex_protocol::protocol::PatchApplyBeginEvent] and [codex_protocol::protocol::PatchApplyEndEvent].
When set, the agent is asking the user to allow writes under this root for the remainder of the session (unclear if this is honored today).
Optional explanatory reason (e.g. request for extra write access).
Use to correlate this with [codex_protocol::protocol::PatchApplyBeginEvent] and [codex_protocol::protocol::PatchApplyEndEvent].