Return a copy of this Prompt with any fields newer than the negotiated
protocol version stripped, so the wire output stays valid for the peer's
version. BaseMetadata.title was introduced by 2025-06-18 (absent from
2025-03-26 and 2024-11-05); Prompt.icons was introduced by 2025-11-25
(absent from every earlier version, present in draft which is
>= 2025-11-25). Mirrors Tool.forVersion.
Return a copy of this Prompt with any fields newer than the negotiated protocol version stripped, so the wire output stays valid for the peer's version. BaseMetadata.title was introduced by 2025-06-18 (absent from 2025-03-26 and 2024-11-05); Prompt.icons was introduced by 2025-11-25 (absent from every earlier version, present in draft which is >= 2025-11-25). Mirrors Tool.forVersion.