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A systemPromptSnapshot option freezes the system prompt for a conversation, so mid-session changes wait for compaction.
A new systemPromptSnapshot option records a conversation's system prompt once and reuses it verbatim on every later request and resume, instead of re-rendering appendSystemPrompt each launch. When a snapshot exists, mid-session model switches or system-prompt changes only take effect after compaction or a new session.
Names in the bundlesystemPromptSnapshotappendSystemPrompt