What
Infrastructure for A/B testing different system prompt variants fetched from the server.
Status
Feature-flagged via tengu_vinteuil_phrase
Details
- New
/api/oauth/claude_cli/client_dataendpoint for fetching system prompt configuration system_prompt_variantfield parsed from client data- When the flag is enabled, a simplified "proactive" system prompt path is used
- Logging added:
[SystemPrompt] client_data system_prompt_variant=and[SystemPrompt] path=simple proactive=
Evidence
System prompt variant system (gated by tengu_vinteuil_phrase, search for "system_prompt_variant" and "/api/oauth/claude_cli/client_data")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.