Module claude_mid_conv_system 

Claude model capability gate for mid-conversation system turns (mid_conv_system content block / system message role).

The Claude API surfaces both as a system-role turn internally; models released before Opus 4.8 reject them with role 'system' is not supported on this model. For those, a mid-conversation system message must be downgraded to a plain assistant turn instead.

Functions

supports_mid_conv_system

Whether this Claude model accepts a mid-conversation system turn. Unknown/future models default to true.