Dalidou runs Claude Code 2.0.60 which does not have this flag (added in 2.1.x). Removed from both extractor_llm.py and the host-side batch script. --append-system-prompt and --disable-slash-commands are supported on 2.0.60. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>