Under the hoodTier: how much it should matter to you
2Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
System PromptArea: what it touches
ImprovementsKind: in v2.1.274,
ImprovementsSection of the release
What
Claude Code now records a marker in the conversation, tagged cause: 'set_model_system_prompt', when the system prompt is regenerated as a result of a model change. New logic uses the position of these markers in the conversation history to decide whether the system prompt needs to be re-rendered again after a model switch.
Why
This helps Claude Code avoid unnecessarily re-rendering the system prompt, by keeping track of exactly when it was last regenerated due to a model change.
