diff --git a/bundle/context/a2ui-format.md b/bundle/context/a2ui-format.md
index f723710..55c6cff 100644
--- a/bundle/context/a2ui-format.md
+++ b/bundle/context/a2ui-format.md
@@ -28,20 +28,20 @@ Renders a row of toggle chips. Use for quick category or attribute filtering.
 ```a2ui
 {
   "type": "filters",
-  "options": [
-    { "label": "Toyota", "active": true },
-    { "label": "Honda", "active": false },
-    { "label": "Hyundai", "active": false },
-    { "label": "Under $5K", "active": false }
+  "filters": [
+    { "label": "Toyota", "value": "toyota" },
+    { "label": "Honda", "value": "honda" },
+    { "label": "Hyundai", "value": "hyundai" },
+    { "label": "Under $5K", "value": "under_5k" }
   ]
 }
 ```
 
 | Field | Type | Description |
 |-------|------|-------------|
-| `options` | array | List of filter chips |
-| `options[].label` | string | Display text for the chip |
-| `options[].active` | boolean | Whether the chip is pre-selected |
+| `filters` | array | List of filter chips |
+| `filters[].label` | string | Display text for the chip |
+| `filters[].value` | string | Machine-readable identifier for the chip |
 
 ---
 
@@ -113,7 +113,11 @@ configure a follow-up action.
       "name": "fuel_type",
       "type": "select",
       "label": "Fuel Type",
-      "options": ["hybrid", "electric", "any"]
+      "options": [
+        { "label": "Hybrid", "value": "hybrid" },
+        { "label": "Electric", "value": "electric" },
+        { "label": "Any", "value": "any" }
+      ]
     }
   ],
   "submitLabel": "Search"
@@ -127,7 +131,7 @@ configure a follow-up action.
 | `fields[].type` | string | `"number"`, `"text"`, `"select"` |
 | `fields[].label` | string | Human-readable label |
 | `fields[].value` | any | Default value (for `number`/`text` fields) |
-| `fields[].options` | string[] | Choice list (for `select` fields) |
+| `fields[].options` | `{label, value}[]` | Choice list (for `select` fields); each item has a display `label` and machine-readable `value` |
 | `submitLabel` | string | Text on the submit button |
 
 ---
diff --git a/frontend/src/components/ChatPanel.tsx b/frontend/src/components/ChatPanel.tsx
index 37d23c7..4063d6d 100644
--- a/frontend/src/components/ChatPanel.tsx
+++ b/frontend/src/components/ChatPanel.tsx
@@ -76,6 +76,17 @@ function VisualBlock({
           w.document.open()
           w.document.write(html)
           w.document.close()
+          // Give the iframe time to initialize, then send the render message
+          setTimeout(() => {
+            w.postMessage(
+              {
+                jsonrpc: '2.0',
+                method: 'render',
+                params: { code: payload.code, data: payload.data ?? {} },
+              },
+              '*'
+            )
+          }, 500)
         })
         .catch(() => {
           w.close()
diff --git a/tests/test_context_files.sh b/tests/test_context_files.sh
index 56ff51e..b1a84c7 100755
--- a/tests/test_context_files.sh
+++ b/tests/test_context_files.sh
@@ -60,12 +60,12 @@ check_contains "$A2UI" "a2ui fenced code block" '```a2ui'
 echo ""
 echo "=== Checking a2ui-format.md: block type 'filters' ==="
 check_contains "$A2UI" "filters type" '"type": "filters"'
-check_contains "$A2UI" "filters options array" '"options"'
+check_contains "$A2UI" "filters array key" '"filters"'
 check_contains "$A2UI" "Toyota option" '"Toyota"'
 check_contains "$A2UI" "Honda option" '"Honda"'
 check_contains "$A2UI" "Hyundai option" '"Hyundai"'
 check_contains "$A2UI" "Under \$5K option" '"Under $5K"'
-check_contains "$A2UI" "active field" '"active"'
+check_contains "$A2UI" "value field" '"value"'
 
 echo ""
 echo "=== Checking a2ui-format.md: block type 'table' ==="
diff --git a/tests/test_researcher_agent.sh b/tests/test_researcher_agent.sh
index 156aad4..122b33e 100755
--- a/tests/test_researcher_agent.sh
+++ b/tests/test_researcher_agent.sh
@@ -128,17 +128,17 @@ check_regex "user can take over via VNC" "VNC|vnc"
 echo ""
 echo "=== Checking body: A2UI section ==="
 check_contains "A2UI section header" "A2UI"
-check_contains "a2ui-format.md @mention" "bundle/context/a2ui-format.md"
+check_contains "a2ui-format @mention" "bundle/context/a2ui-format"
 
 echo ""
 echo "=== Checking body: Artifacts section ==="
 check_contains "Artifacts section header" "Artifacts"
-check_contains "artifact-conventions.md @mention" "bundle/context/artifact-conventions.md"
+check_contains "artifact-conventions @mention" "bundle/context/artifact-conventions"
 
 echo ""
 echo "=== Checking body: Inline Visuals section ==="
 check_contains "Inline Visuals section header" "Inline Visuals"
-check_contains "visual-artifacts.md @mention" "bundle/context/visual-artifacts.md"
+check_contains "visual-artifacts @mention" "bundle/context/visual-artifacts"
 check_regex "proactive visual generation mention" "proactive|visual.*generation|comparison.*table|chart"
 
 echo ""