OPERATIONS_KEY
The key under which a tool result, or an activity's content, carries an array of A2UI envelopes: {"a2ui_operations": [{"version": "v0.9", "createSurface": {...}}, ...]}.
The key under which a tool result, or an activity's content, carries an array of A2UI envelopes: {"a2ui_operations": [{"version": "v0.9", "createSurface": {...}}, ...]}.