Found docs updates needed from ADK python release v1.19.0 to v1.20.0

[adk-bot]

I have analyzed the code changes between ADK Python releases v1.19.0 and v1.20.0 and identified the following documentation updates.

Compare link: google/adk-python@v1.19.0...v1.20.0

1. New TransferToAgentTool and Unique Sub-Agent Name Validation

• Summary of Change: The transfer_to_agent tool now has a TransferToAgentTool wrapper that provides enum constraints to the agent_name parameter, preventing the LLM from using non-existent agent names. Additionally, the framework now validates that all sub-agents have unique names.
• Files to Update:
  • docs/agents/multi-agents.md
  • docs/tutorials/agent-team.md
• Instructions:
  • In docs/agents/multi-agents.md, update the section on LLM-Driven Delegation to mention the TransferToAgentTool and its benefits.
  • Add a note about the unique name validation for sub-agents in docs/agents/multi-agents.md.
  • In docs/tutorials/agent-team.md, refactor the examples to use the TransferToAgentTool instead of the raw transfer_to_agent function.
• Reference: src/google/adk/tools/transfer_to_agent_tool.py, src/google/adk/agents/base_agent.py

2. Streaming Function Call Arguments

• Summary of Change: The ADK now supports streaming for function call arguments, allowing for more responsive user experiences.
• Files to Update:
  • docs/streaming/dev-guide/part3.md
• Instructions:
  • Add a new section to docs/streaming/dev-guide/part3.md explaining the new feature of streaming function call arguments.
  • Provide a code example of how to use this feature.
• Reference: src/google/adk/utils/streaming_utils.py

3. Multi-Provider Support for Claude and LiteLLM

• Summary of Change: The ADK now has built-in support for Anthropic's Claude models and a wide range of other models through LiteLLM.
• Files to Update:
  • docs/agents/models.md
  • docs/tutorials/agent-team.md
• Instructions:
  • Update docs/agents/models.md to include sections for Claude and LiteLLM, explaining how to configure and use them.
  • Update the agent-team.md tutorial to include an example of using a Claude or LiteLLM model in one of the agents.
• Reference: src/google/adk/models/anthropic_llm.py, src/google/adk/models/lite_llm.py

4. APIRegistryToolset

• Summary of Change: A new APIRegistryToolset allows agents to discover and use tools from a Google Cloud API Registry.
• Files to Update:
  • docs/tools-custom/index.md
  • Create docs/tools-custom/api-registry-toolset.md
• Instructions:
  • Add a link to the new api-registry-toolset.md page in docs/tools-custom/index.md.
  • Create a new page docs/tools-custom/api-registry-toolset.md with detailed documentation on how to use the APIRegistryToolset, including setup and examples.
• Reference: src/google/adk/tools/api_registry.py

5. AgentTool Plugin Propagation

• Summary of Change: The AgentTool now has an include_plugins parameter to control whether plugins from the parent runner are propagated to the agent's runner.
• Files to Update:
  • docs/tools-custom/function-tools.md
• Instructions:
  • In docs/tools-custom/function-tools.md, update the AgentTool section to document the include_plugins parameter and its usage.
• Reference: src/google/adk/tools/agent_tool.py

6. New /list-apps Web Endpoint

• Summary of Change: The ADK web server now has a /list-apps endpoint to list available applications with details.
• Files to Update:
  • Create docs/web/reference.md
• Instructions:
  • Create a new file docs/web/reference.md to document the ADK web server's API endpoints.
  • Add documentation for the /list-apps endpoint, including its parameters and response format.
• Reference: src/google/adk/cli/adk_web_server.py

7. Update to Python 3.10

• Summary of Change: The minimum required Python version for ADK has been raised to 3.10.
• Files to Update:
  • docs/get-started/python.md
• Instructions:
  • Update the Python version requirement in docs/get-started/python.md to 3.10.
  • Search for and update any other mentions of the minimum Python version throughout the documentation.
• Reference: src/google/adk/a2a/converters/part_converter.py

8. Spanner Toolset updates

• Summary of Change: Added vector_store_similarity_search to SpannerToolset. SpannerVectorStoreSettings is introduced to support this feature.
• Files to Update:
  • docs/tools/built-in-tools.md
• Instructions:
  • Update the Spanner toolset documentation to include the new vector_store_similarity_search tool and the SpannerVectorStoreSettings.
• Reference: src/google/adk/tools/spanner/search_tool.py, src/google/adk/tools/spanner/settings.py