Update sample agent to connect to hosted MCP server by default

[kmoscoe]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @kmoscoe, 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 refactors the sample basic_agent to establish its default connection to a hosted Multi-Cloud Platform (MCP) server via HTTP. This change simplifies the agent's operational setup by eliminating the need for a local standard I/O server, thereby leveraging a remote service for its functionality.

Highlights

• Connection Method Update: The sample agent's connection to the MCP server has been updated from using local standard I/O (StdioConnectionParams) to a hosted HTTP endpoint (StreamableHTTPConnectionParams).
• Dependency Changes: Imports for StdioConnectionParams and StdioServerParameters have been removed, and StreamableHTTPConnectionParams has been added to support the new HTTP connection.
• Class Name Refinement: The McpToolset class name has been updated to MCPToolset to reflect a potential naming convention change.
• Hosted Server Configuration: The MCPToolset is now configured to connect to https://api.datacommons.org/mcp and includes necessary HTTP headers such as Content-Type, Accept, and X-API-Key.

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[gemini-code-assist]

Code Review

This pull request updates the basic sample agent to connect to the hosted Data Commons MCP server by default, replacing the previous implementation that used a local stdio server. The changes correctly use StreamableHTTPConnectionParams to configure the connection. My review includes a suggestion to make the MCP server URL configurable through an environment variable, which would improve the sample agent's flexibility for different environments.

[gemini-code-assist]

The MCP server URL is hardcoded. For better flexibility, consider making this configurable via an environment variable, similar to DC_API_KEY and AGENT_MODEL. This would allow the agent to easily connect to different environments (e.g., staging, local) without code changes.

Suggested change

	url=f"https://api.datacommons.org/mcp",
	url=os.environ.get("MCP_URL", "https://api.datacommons.org/mcp"),