QA: Declarative Generative UI (A2UI — Dynamic Schema) — Google ADK

Prerequisites

Demo is deployed and accessible at /demos/declarative-gen-ui on the dashboard host
Agent backend is healthy (/api/health); GOOGLE_API_KEY is set; AGENT_URL points at the ADK agent server exposing the declarative_gen_ui agent path (registered as agent name declarative-gen-ui — see src/app/api/copilotkit-declarative-gen-ui/route.ts)
The demo plays a sales analyst for the fictional Vantage Threads company. The dataset and per-question composition rules are registered as agent context in src/app/demos/declarative-gen-ui/sales-context.ts — surfaces should reflect those numbers ($4.2M Q2 revenue, 4 regions, 5 reps, 3 at-risk accounts, Meridian Apparel Group as top account)
Each custom renderer carries a stable data-testid: declarative-card, declarative-metric, declarative-pie-chart, declarative-bar-chart, declarative-status-badge, declarative-data-table, declarative-info-row (see src/app/demos/declarative-gen-ui/a2ui/renderers.tsx)

Navigate to /demos/declarative-gen-ui; verify the page renders within 3s and a single CopilotChat pane is centered (max-width ~896px, rounded-2xl, full-height)
Verify the chat is wired to runtimeUrl="/api/copilotkit-declarative-gen-ui" and agent="declarative-gen-ui" (DevTools → Network: sending a message hits that endpoint, not /api/copilotkit)
Verify all 4 suggestion pills are visible with verbatim titles:
- "Show my sales dashboard"
- "Team performance"
- "Anything at risk?"
- "Top account details"
Verify no pill mentions a chart type — chart steering lives in the agent instruction, not the user prompt (OSS-136)
Send "Hello" and verify an assistant text response appears within 10s (no A2UI surface rendered for plain text)

DevTools → Network: on first tool-driven response, verify the response stream contains an a2ui_operations container with catalogId: "declarative-gen-ui-catalog" (matches createCatalog(..., { catalogId: "declarative-gen-ui-catalog" }) in a2ui/catalog.ts)

Click "Show my sales dashboard"; within 60s verify ONE composed surface renders containing ALL of (no surrounding Card — the charts carry their own card chrome):
- a bare row of 4 declarative-metric KPI tiles (uppercase label, large value, trend arrow with delta — green ↑ for up, red ↓ for down, e.g. "↑ 12% QoQ")
- a declarative-pie-chart (recharts donut mirroring beautiful-chat: innerRadius 40 / outerRadius 80, one .recharts-pie-sector per slice, tooltip on hover, no legend) showing revenue by region
- a declarative-bar-chart (recharts, height 200, single blue #3b82f6 bars with rounded tops, dashed grid) showing monthly revenue
Verify the surface is a single composed dashboard, NOT a lonely single widget — this is the regression OSS-136 was filed about
Verify the pie slices cycle through the shared palette (#3b82f6, #8b5cf6, #ec4899, #f59e0b, #10b981, #6366f1) and bars are uniform blue #3b82f6 — identical chrome to beautiful-chat's sales dashboard (12px-radius cards, 20px padding, soft shadow)
Verify the chat reply text beneath the surface is one short sentence (per the agent instruction: let the UI do the talking)
Verify metric numbers match the Vantage Threads dataset (revenue $4.2M, 186 new customers, 31% win rate, $22.6k avg deal)

Click "Team performance"; within 60s verify a declarative-data-table renders inside a Card: uppercase column headers (Rep / Attainment / Pipeline), one body row per rep (5 reps, Dana Whitfield through Elena Vasquez), tabular numerals
Verify a quota-attainment BarChart renders alongside the table (dashboardy, not a bare table); no StatusBadge or InfoRow

Click "Anything at risk?"; within 60s verify a risk panel: a KPI strip of Metric tiles (ARR at risk $615k, accounts at risk 3, biggest exposure Northwind $340k) above three side-by-side account Cards (Northwind Retail, Cascadia Outfitters, Atlas Goods), each with a content-sized declarative-status-badge (error = high severity, warning = medium) and a one-line reason + recommended next action
Verify no charts or tables render for this pill

Click "Top account details"; within 60s verify a Card for Meridian Apparel Group with at least 3 declarative-info-row label/value rows (Owner, Region, ARR, Renewal, Last contact), each separated by a 1px bottom border
Verify a product-line PieChart renders next to the fact card (grounded in Meridian's product mix); no DataTable or StatusBadge

Run all 4 pills in one conversation; verify each pill mounts its distinguishing component fresh (the D5 probe showcase/harness/src/probes/scripts/d5-gen-ui-declarative.ts asserts a newly-mounted testid per pill — leftovers from earlier pills must not be the only match)

Send an empty message; verify it is a no-op (no user bubble, no assistant response)
Send "What is 2+2?"; verify the agent replies in plain text without invoking generate_a2ui (no a2ui_operations in the response stream, no surface rendered)
DevTools → Console: walk through all flows above; verify no uncaught errors, no React error #31, and no A2UI render-error banners ("Cannot create component root without a type", "Catalog not found")

Chat loads within 3s; plain-text response within 10s; A2UI surfaces render within 60s of prompt (secondary-LLM pass can be slow on cold start)
generate_a2ui is called exactly once per surface-producing prompt; result contains a valid a2ui_operations container with catalogId: "declarative-gen-ui-catalog"
The hero pill produces a composed dashboard (4 KPI tile metrics + 1 PieChart + 1 BarChart in one surface, with NO surrounding Card per OSS-136); pills 2-4 produce their distinguishing component (data-table / status-badge / info-row)
Numbers are consistent with the Vantage Threads dataset across all four pills
No UI layout breaks, no flash of unstyled content, no uncaught console errors