Assistant: drop a2ui surfaces, fall back to markdown tables

CK 1.60+ validates generated a2ui ops against a component catalog before
painting, and our agent's ops fail validation — surfaces hang at
"Building interface" forever (MAF also drops RunAgentInput.context, so
the catalog/guidelines never even reach the model). Disable a2ui end to
end until the pipeline matures:

- server.ts: a2ui { enabled: false }; RENDER_TOOLS no longer includes
  render_a2ui
- App.tsx: remove the a2ui provider prop
- agent.py: prompt now asks for clean markdown tables for lists and
  structured data; render_spending_summary card guidance unchanged

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

backend/app/agent/agent.py

@@ -34,7 +34,9 @@ How to answer:
   (e.g. net worth + recent transactions).
 - Format currency with the appropriate symbol: ₡ for CRC (no decimals), $ for
   USD (two decimals), € for EUR (two decimals).
-- When showing lists, prefer markdown tables over prose.
+- When showing lists or structured data (transactions, breakdowns, funds),
+  format them as clean markdown tables: right-align amounts, include a total
+  row when summing, keep merchant names as-is.
 - If a tool returns no data, say so explicitly — do not fill in zeros.
 - You are read-only in this version. If asked to create, edit or delete
   anything, explain that write actions aren't available yet and offer to
@@ -47,17 +49,13 @@ Generative UI — render tools:
 - When showing spending totals, cycle summaries, or category breakdowns →
   call render_spending_summary. Source data: get_cycle_summary (by_source,
   grand_total_crc) + get_analytics_by_category (by_category).
-- When showing transaction lists or other structured data →
-  call render_a2ui in a SEPARATE tool-call step, only after all data-fetching
-  calls have returned. NEVER call render_a2ui in the same batch as any other
-  tool.
-- Do NOT use markdown tables for data a render tool can display.
-- CRITICAL RULE: When you call a render tool (render_spending_summary or
-  render_a2ui), that tool call MUST be the ONLY content in your message.
-  Do NOT include any text content alongside the tool call — no introduction,
-  no list, no explanation, nothing. The rendered card IS the complete
-  response. Any text you write in the same message as a render call will
-  appear as a duplicate below the card, which is wrong.
+- Do NOT use markdown tables for data render_spending_summary can display.
+- CRITICAL RULE: When you call render_spending_summary, that tool call MUST
+  be the ONLY content in your message. Do NOT include any text content
+  alongside the tool call — no introduction, no list, no explanation,
+  nothing. The rendered card IS the complete response. Any text you write in
+  the same message as a render call will appear as a duplicate below the
+  card, which is wrong.
 """
 
 

frontend/server.ts

@@ -197,7 +197,7 @@ class StripModelArtifactsMiddleware extends (Middleware as any) {
 // below the card. This middleware buffers TEXT_MESSAGE_* events and discards
 // them if any render tool call is detected in the same turn.
 
-const RENDER_TOOLS = new Set(["render_a2ui", "render_spending_summary"]);
+const RENDER_TOOLS = new Set(["render_spending_summary"]);
 
 // eslint-disable-next-line @typescript-eslint/no-explicit-any
 class SuppressRenderToolTextMiddleware extends (Middleware as any) {
@@ -311,7 +311,10 @@ app.all("/api/copilotkit/*", async (c) => {
 
   const runtime = new CopilotRuntime({
     agents: { wealthysmart: agent },
-    a2ui: { injectA2UITool: true },
+    // a2ui disabled 2026-07-04: CK 1.60+ validates generated ops against a
+    // catalog and our agent's ops fail validation (surface never paints).
+    // Markdown tables cover the use case until the pipeline matures.
+    a2ui: { enabled: false },
     beforeRequestMiddleware: async ({ request: outbound }) => {
       if (outbound.method !== "POST") return;
       const ct = outbound.headers.get("content-type") ?? "";

frontend/src/App.tsx

@@ -77,7 +77,7 @@ export default function App() {
         <PrivacyProvider>
           <AuthProvider>
             <QueryClientProvider client={queryClient}>
-              <CopilotKit runtimeUrl="/api/copilotkit" agent="wealthysmart" a2ui={{}}>
+              <CopilotKit runtimeUrl="/api/copilotkit" agent="wealthysmart">
                 <AppRoutes />
                 <Toaster richColors position="top-right" closeButton />
               </CopilotKit>