release aidev NEEDS REVIEW SIG 2/5

Claude Code 2.1.201: harness reminders drop the mid-conversation system role on Sonnet 5

Single-line release. Claude Code no longer injects harness reminders using the mid-conversation system role in Claude Sonnet 5 sessions. The notes give no reason or user-facing effect.

PUBLISHED2026-07-03

OBSERVED2026-08-11

AGE1mo

SOURCES1

Claude Sonnet 5 sessions no longer use the mid-conversation system role for harness reminders

api-change model-support

COMMUNITY

No curated reactions recorded for this event. Facts and takes are kept in separate layers — community context is added by hand, never blended into the record above.