Update ADK doc according to issue #1587 - 14

[adk-bot]

Google Cloud Agent Registry integration.

Create (or update if a similar page exists) documentation for the Google Cloud Agent Registry integration. Explain that the AgentRegistry client now supports interacting with "Endpoints" via list_endpoints(), get_endpoint(), and get_model_name(). Additionally, document that get_mcp_toolset() now accepts auth_scheme and auth_credential parameters to attach authentication to the retrieved MCP toolset, and that get_remote_a2a_agent() supports custom httpx_client injection.

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[jcwriter74]

PROPOSED UPDATE

Google Cloud Agent Registry integration

• Create (or update if a similar page exists) documentation for the Google Cloud Agent Registry integration.

Link: https://github.com/google/adk-docs/blob/main/docs/integrations/agent-registry.md

• Explain that the AgentRegistry client now supports interacting with "Endpoints" via list_endpoints(), get_endpoint(), and get_model_name().

Interacting with "Endpoints:

AgentRegistry clients can now support interactions with “Endpoints” through list_endpoints(), get_endpoint(), and get_model_name().
This kind of interaction allows better data governance, discoverability and dynamic resolution.

What is an Endpoint?

An Endpoint possibilitates for agents to engage with a recorded target destination.

What are list_endpoints(), get_endpoint(), and get_model_name()?

• list_endpoints(): method to discover all registered endpoints within a specific Google Cloud project and location.
• get_endpoint(): method to retrieve the full configuration details of a specific endpoint resource: its destination URL, description, and the protocol bindings required to connect to it.
• get_model_name(): method to resolve and parse the underlying model identifier from a given endpoint or resource string.

• Additionally, the document that get_mcp_toolset() now accepts auth_scheme and auth_credential parameters to attach authentication to the retrieved MCP toolset, and that get_remote_a2a_agent() supports custom httpx_client injection.

get_mcp_toolset() accepts auth_scheme and auth_credential parameters
Adding the Auth parameters provides secure, muti-tenant, and/or governed agents.
WIth auth_scheme and auth_credential, the ADK's authentication framework can manage and attach credentials to requests, token exchanges, and refreshes if necessary.
get_remote_a2a_agent() supports custom httpx_client injection.
By injecting a custom httpx_client, developers gain granular control over the networking layer:
Timeouts: set custom timeout values for agents.
Proxies: traffic to go through a specific proxy.
Custom Authentication: use httpx.Auth subclasses to handle complex authentication flows.
Instead of just a default-configured HTTP client, you can tailor the client's behavior to meet specifics.

Resources:
Duckie * https://duckie.corp.google.com/thread/348130f7-2a0c-4dd2-925b-f8cbfe3fa8b0
Google AI Studio * https://aistudio-preprod.corp.google.com/prompts/1jLyLmnszutupGmKQ7puTEhwQIti-3vj_?resourceKey=0-3_7IO5rqZI2dnsMvN0W2tw