The saveMessages knob has been parsed by HonchoClientConfig since its introduction but was never consumed: sync_turn, on_memory_write and on_session_end persisted to Honcho regardless. With saveMessages=false the provider now never writes automatically (raw turns, memory-write conclusion mirroring, session-end flush) while read/tools paths stay fully functional. Guard uses getattr with a True default so legacy/injected configs keep the old behavior. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018giroL5zeMPnPxERxAxXHY