Invocation params that select or invalidate a provider cache entry.

The identity check compares only these, plus the provider's reasoning-effort settings where a change is documented to move the cached prefix (see _EFFORT_CACHE_IDENTITY_PROVIDERS). Comparing whole model_params maps instead would report a model change for every unrelated knob -- temperature or max_tokens, for example -- and the modal would then assert that "the previous cached prefix cannot be reused" when nothing about the prefix moved. A modal that fires on a false premise trains users into the permanent suppression.

cache_control is deliberately absent: AnthropicPromptCachingMiddleware overwrites model_settings["cache_control"] with its own TTL on every Anthropic request (see _ANTHROPIC_MIDDLEWARE_TTL_SECONDS), so a user-supplied value never reaches the wire. Comparing it would report an identity change for a setting the effective requests never differed on.