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feat: Enable injection of httpx client factory for streamable-http mcp client #2996

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@mikeedjones
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@mikeedjones mikeedjones commented Sep 22, 2025

#2227 and #2881 both request slightly different options to control the ssl certs used internally by adk.

This PR addresses a related but distinct case of control over the ssl cert used when connecting to an mcp server by exposing the httpx_client_factory parameter exposed when creating a MCPSessionManager in adk.

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Summary of Changes

Hello @mikeedjones, I'm Gemini Code Assist1 ! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the adk's MCPSessionManager by introducing the ability to inject a custom httpx_client_factory. This change provides greater flexibility, particularly for managing SSL certificate configurations, when establishing connections to an MCP server, addressing a previously identified need for more control over internal HTTP client options.

Highlights

  • HTTP Client Customization: Enables the injection of an httpx_client_factory for streamable-http MCP clients, allowing for custom httpx client instantiation.
  • SSL Certificate Control: Provides a mechanism for more granular control over SSL certificates and other httpx client configurations used when connecting to an MCP server.
  • Pydantic Configuration Update: The StreamableHTTPConnectionParams model now allows arbitrary types to accommodate the new McpHttpClientFactory.
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@adk-bot adk-bot added bot triaged mcp [Component] Issues about MCP support labels Sep 22, 2025
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adk-bot commented Sep 22, 2025

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Hello @mikeedjones, thank you for creating this PR!

To help us review this pull request, could you please:

  1. Sign our Contributor License Agreement (CLA).
  2. Include a testing plan section in your PR to describe how you tested these changes.

This information will help reviewers to review your PR more efficiently. Thanks!

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Code Review

This pull request introduces a valuable feature by allowing the injection of an httpx client factory for the streamable HTTP MCP client. This enhances flexibility, particularly for managing SSL certificates. The implementation is clean and follows existing patterns. My main feedback is to add unit tests to cover this new functionality to ensure its correctness and prevent future regressions.

timeout: float = 5.0
sse_read_timeout: float = 60 * 5.0
terminate_on_close: bool = True
httpx_client_factory: Optional[McpHttpClientFactory] = None
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medium

While the addition of httpx_client_factory is a great feature for customizability, the pull request seems to be missing corresponding unit tests. It would be beneficial to add tests to tests/unittests/tools/mcp_tool/test_mcp_session_manager.py to ensure that:

  • StreamableHTTPConnectionParams can be initialized correctly with the httpx_client_factory.
  • The _create_client method correctly passes the factory to the streamablehttp_client.

Adding these tests will help verify the new functionality and prevent future regressions.

@mikeedjones mikeedjones force-pushed the feature/add-custom-httpx-client-factory-in-mcp-tool branch from bb4caa6 to e6c5820 Compare September 22, 2025 17:29
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