{"version":"2.1.30","anchor":"system-prompt-variants-in-development","canonical_anchor":"system-prompt-variants-in-development","heading":"System Prompt Variants [In Development]","tier":null,"area":null,"scope":null,"heads_up":null,"url":"https:\/\/changelogs.core-directive.com\/v\/2.1.30\/e\/system-prompt-variants-in-development","release_url":"https:\/\/changelogs.core-directive.com\/v\/2.1.30","markdown":"### System Prompt Variants [In Development]\n\n**What**\n\nInfrastructure for A\/B testing different system prompt variants fetched from the server.\n\n**Status**\n\nFeature-flagged via `tengu_vinteuil_phrase`\n\n**Details**\n\n- New `\/api\/oauth\/claude_cli\/client_data` endpoint for fetching system prompt configuration\n- `system_prompt_variant` field parsed from client data\n- When the flag is enabled, a simplified \"proactive\" system prompt path is used\n- Logging added: `[SystemPrompt] client_data system_prompt_variant=` and `[SystemPrompt] path=simple proactive=`\n\n**Evidence**\n\nSystem prompt variant system (gated by `tengu_vinteuil_phrase`, search for `\"system_prompt_variant\"` and `\"\/api\/oauth\/claude_cli\/client_data\"`)"}