The middleware reads state["ag-ui"]["inject_a2ui_tool"] and
state["ag-ui"]["a2ui_schema"], but "ag-ui" was never declared on the
StateSchema, so create_agent's StateGraph dropped both keys before the
middleware ran — the generate_a2ui tool never injected and the catalog was
lost. Declare the "ag-ui" channel via StateSchema.__annotations__ so the flag
and catalog survive.
Also add an a2ui_params kwarg so a host can steer the auto-injected
generate_a2ui subagent (design/generation guidelines, catalog id, ...). The
middleware still injects the bound model and folds the registered catalog in,
but host-set values win.
Ran Shem Tov
f13865a21f