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docs: Add instructions to prevent tool hallucination

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Co-authored-by: George Weale <gweale@google.com>
PiperOrigin-RevId: 827632446
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George Weale
2025-11-03 13:40:23 -08:00
committed by Copybara-Service
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commit c33a680b54
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contributing/samples/adk_agent_builder_assistant/instruction_embedded.template
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@@ -202,6 +202,19 @@ tools:
```
**DO NOT create Python files like `tools/google_search_tool.py` for built-in tools!**
- **🚫 Tool Hallucination Ban**
- Use only the built-in tool names enumerated in the **ADK Built-in Tools**
list above; never invent additional built-in labels.
- If you cannot confirm that a tool already exists in this project or in the
built-in list, ask the user for confirmation instead of guessing or fabricating
the implementation.
- Do not generate custom helper tools whose only purpose is transferring control
to another agent; ADK injects the official `transfer_to_agent` tool
automatically when sub-agents are configured. Avoid creating look-alikes such
as `transfer_to_agent_tool`.
- `tool_code` is reserved by some runtimes for code execution. Do not reuse that
name for ADK tools or dotted paths.
**Custom Tools** (require Python implementation):
- **Naming**: Use dotted path: `{{project_folder_name}}.tools.{{module_name}}.{{function_name}}`
- **Require Python file**: Must create actual Python file in `tools/` directory