feat(samples): add enterprise_dashboard with compact layout patterns

samples/agent/adk/enterprise_dashboard/README.md

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+# Enterprise Dashboard Sample
+
+A visual-first analytics agent that renders business data as compact A2UI
+component layouts instead of markdown text walls.
+
+## Why this sample exists
+
+LLMs default to markdown when presenting data — tables, bullet lists, headers.
+This produces verbose "walls of text" that are hard to scan and don't leverage
+A2UI's component system. This sample demonstrates the prompt engineering
+patterns that produce compact, information-dense visual layouts.
+
+## Layout Patterns
+
+| Data Type | Markdown (bad) | A2UI (good) |
+|-----------|---------------|-------------|
+| KPI metrics | Inline numbers in paragraphs | Row of Card components with bold Text |
+| Comparisons | Markdown table | Row of Card components side-by-side |
+| Rankings | Numbered list | List with Card children |
+| Multi-section | Multiple markdown headers | Tabs component |
+| Separators | `---` or blank lines | Divider component |
+| Status | Text like "up" or "down" | Icon (trending_up, trending_down) |
+
+## Key prompt techniques
+
+1. **Anti-markdown rules** — Explicit bans with A2UI alternatives:
+   "NEVER use markdown tables — use Row + Card instead."
+
+2. **Layout recipes** — Map each data type to a component composition:
+   "KPI metrics: Row of Card components, each with bold metric Text."
+
+3. **Output ordering** — A2UI JSON first, brief text after:
+   "Output A2UI JSON block(s) FIRST, then at most 1-2 sentences."
+
+4. **Component diversity** — Prevent monotonous layouts:
+   "Minimum 3 different component types per response."
+
+## Running
+
+```bash
+cd samples/agent/adk
+adk web enterprise_dashboard
+```
+
+Then try these queries:
+- "Show me this week's KPIs"
+- "Compare store performance"
+- "What are the top 5 products?"
+- "Give me a full dashboard with KPIs, store comparison, and top products"
+
+## Example output
+
+See `examples/0.8/` for reference A2UI JSON payloads:
+- `kpi_dashboard.json` — 4 KPI metric cards in a Row layout
+- `store_comparison.json` — 3 store cards with Icon status indicators
+
+## Related PRs
+
+- [#1465](https://github.com/google/A2UI/pull/1465) — `strict_output` mode
+  for `generate_system_prompt()` (SDK-level enforcement)
+- [#1466](https://github.com/google/A2UI/pull/1466) — `A2UIOutputMode` enum
+  for unified TEXT/TOOL prompt generation

samples/agent/adk/enterprise_dashboard/__init__.py

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+# Copyright 2026 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from . import agent

samples/agent/adk/enterprise_dashboard/agent.py

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+# Copyright 2026 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Enterprise analytics dashboard agent.
+
+Demonstrates compact, visual-first A2UI output patterns for data-dense
+enterprise use cases. Run with: adk web
+"""
+
+import os
+
+from google.adk.agents.llm_agent import LlmAgent
+from google.adk.models import Gemini
+from .prompt_builder import get_dashboard_prompt
+from .tools import get_kpi_summary, get_store_comparison, get_product_rankings
+
+model_name = os.getenv("MODEL_NAME", "gemini-2.0-flash")
+
+root_agent = LlmAgent(
+    model=Gemini(model=model_name),
+    name="enterprise_dashboard",
+    description=(
+        "Visual-first analytics dashboard that renders business data as "
+        "compact A2UI component layouts instead of text."
+    ),
+    instruction=get_dashboard_prompt(),
+    tools=[get_kpi_summary, get_store_comparison, get_product_rankings],
+)

samples/agent/adk/enterprise_dashboard/examples/0.8/kpi_dashboard.json

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+[
+  {
+    "beginRendering": {
+      "surfaceId": "kpi-dashboard",
+      "root": "root"
+    }
+  },
+  {
+    "surfaceUpdate": {
+      "surfaceId": "kpi-dashboard",
+      "components": [
+        {
+          "id": "root",
+          "component": {
+            "Column": {
+              "children": {
+                "explicitList": ["header", "metrics-row", "divider", "summary"]
+              }
+            }
+          }
+        },
+        {
+          "id": "header",
+          "component": {
+            "Row": {
+              "children": {
+                "explicitList": ["header-icon", "header-title"]
+              },
+              "alignment": "center"
+            }
+          }
+        },
+        {
+          "id": "header-icon",
+          "component": {
+            "Icon": {
+              "name": {
+                "literalString": "star"
+              }
+            }
+          }
+        },
+        {
+          "id": "header-title",
+          "component": {
+            "Text": {
+              "text": {
+                "literalString": "**Weekly Performance Dashboard**"
+              },
+              "usageHint": "h2"
+            }
+          }
+        },
+        {
+          "id": "metrics-row",
+          "component": {
+            "Row": {
+              "children": {
+                "explicitList": ["revenue-card", "txn-card", "aov-card", "csat-card"]
+              }
+            }
+          }
+        },
+        {
+          "id": "revenue-card",
+          "component": {
+            "Card": {
+              "child": "revenue-text"
+            }
+          }
+        },
+        {
+          "id": "revenue-text",
+          "component": {
+            "Text": {
+              "text": {
+                "literalString": "**Revenue**\n\n**$284,500**\n\n+8.3% vs last week"
+              }
+            }
+          }
+        },
+        {
+          "id": "txn-card",
+          "component": {
+            "Card": {
+              "child": "txn-text"
+            }
+          }
+        },
+        {
+          "id": "txn-text",
+          "component": {
+            "Text": {
+              "text": {
+                "literalString": "**Transactions**\n\n**12,450**\n\n+5.1% vs last week"
+              }
+            }
+          }
+        },
+        {
+          "id": "aov-card",
+          "component": {
+            "Card": {
+              "child": "aov-text"
+            }
+          }
+        },
+        {
+          "id": "aov-text",
+          "component": {
+            "Text": {
+              "text": {
+                "literalString": "**Avg Order**\n\n**$22.85**\n\n-1.2% vs last week"
+              }
+            }
+          }
+        },
+        {
+          "id": "csat-card",
+          "component": {
+            "Card": {
+              "child": "csat-text"
+            }
+          }
+        },
+        {
+          "id": "csat-text",
+          "component": {
+            "Text": {
+              "text": {
+                "literalString": "**Satisfaction**\n\n**4.6/5**\n\n+0.2 vs last week"
+              }
+            }
+          }
+        },
+        {
+          "id": "divider",
+          "component": {
+            "Divider": {
+              "axis": "horizontal"
+            }
+          }
+        },
+        {
+          "id": "summary",
+          "component": {
+            "Card": {
+              "child": "summary-text"
+            }
+          }
+        },
+        {
+          "id": "summary-text",
+          "component": {
+            "Text": {
+              "text": {
+                "literalString": "**Top Store:** Downtown Market ($112,400) · **Top Product:** Organic Apples (1,240 units)"
+              }
+            }
+          }
+        }
+      ]
+    }
+  }
+]