| @tanstack/ai-anthropic | minor |
|---|
Drop modelOptions.system from the accepted Anthropic provider options. System prompts must now flow through the top-level systemPrompts option on chat()/structuredOutput().
This was an undocumented escape hatch only reachable via casts, but it was the only way to attach cache_control to system blocks for prompt caching. Until systemPrompts is widened to carry per-prompt metadata (planned follow-up), callers who need Anthropic cache_control on system text should keep using modelOptions.system on the prior version, or supply a custom adapter override.
To make the removal loud instead of silent, the adapter now logs an errors-category log line via the provided Logger whenever unknown modelOptions keys are passed (including system). Callers casting around the public type will see the dropped keys named in the log, rather than the request going out without them.