Claude Code v2.1.201 Released: Sonnet 5 Session Reminders Changed

Core summary

One sentence to understand this update

Claude Code v2.1.201 has been released, changing how Claude Sonnet 5 sessions handle harness reminders by no longer using the mid-conversation system role.

Impact & opportunity

What this could mean

Builders developing with Claude Sonnet 5 should note this behavioral change to adjust their prompt engineering and workflows accordingly.