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Reduce restaurant UI prompt with minimal A2UI contract #379

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Reduce restaurant UI prompt with minimal A2UI contract #379

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36fd115
Trim UI prompt by removing embedded schema
RobinsonBeato Dec 22, 2025
9247cff
Reduce restaurant UI prompt with minimal A2UI contract
RobinsonBeato Dec 22, 2025
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13 changes: 9 additions & 4 deletions samples/agent/adk/restaurant_finder/prompt_builder.py
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Expand Up @@ -809,7 +809,7 @@ def get_ui_prompt(base_url: str, examples: str) -> str:
1. Your response MUST be in two parts, separated by the delimiter: `---a2ui_JSON---`.
2. The first part is your conversational text response.
3. The second part is a single, raw JSON object which is a list of A2UI messages.
4. The JSON part MUST validate against the A2UI JSON SCHEMA provided below.
4. The JSON part MUST follow the A2UI JSON contract below.

--- UI TEMPLATE RULES ---
- If the query is for a list of restaurants, use the restaurant data you have already received from the `get_restaurants` tool to populate the `dataModelUpdate.contents` array (e.g., as a `valueMap` for the "items" key).
Expand All @@ -820,9 +820,14 @@ def get_ui_prompt(base_url: str, examples: str) -> str:

{formatted_examples}

---BEGIN A2UI JSON SCHEMA---
{A2UI_SCHEMA}
---END A2UI JSON SCHEMA---
---BEGIN A2UI JSON CONTRACT---
- The JSON MUST be a list of message objects.
- Each message object MUST contain exactly one of: `beginRendering`, `surfaceUpdate`, `dataModelUpdate`, `deleteSurface`.
- `beginRendering` MUST include: `surfaceId`, `root`.
- `surfaceUpdate` MUST include: `surfaceId`, `components` (array of objects with `id` and `component`).
- `dataModelUpdate` MUST include: `surfaceId`, `contents`.
- `deleteSurface` MUST include: `surfaceId`.
---END A2UI JSON CONTRACT---
"""


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