Per PRD (Misc Legacy / expert zone), an Agent App must support conversation
opener, follow-up suggestions, citations, content moderation and annotation
reply. These app-level presentation features live on app_model_config (design
Q3), but create_app never made one for Agent Apps, so they were unconfigurable
and /parameters returned hardcoded defaults.
create_app now creates a model-less app_model_config row for AppMode.AGENT
(model/prompt/tools stay in the Agent Soul; agent_mode left unset so
App.is_agent stays False and the app mode is not mutated). The webapp
/parameters endpoint and the chat pipeline already read feature flags from
this row.
Live-verified: a fresh Agent App gets the row; setting opening_statement +
suggested_questions persists and surfaces through /v1/parameters, while chat
continues to stream Soul-backed answers.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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