Add examples of icons on tools, resources, prompts, and server implementation to EverythingServer

[mikekistler]

Motivation and Context

This PR adds examples of icons for tools, resources, and prompts to the EverythingServer. It also adds icons and metadata to the server implementation. This illustrates the icons and metadata features added to the 2025-11-25 version of the MCP spec by SEP-973.

How Has This Been Tested?

I started the EverythingServer and connected to it with the MCP Inspector, and could see the icons associated with the weather tool and add tool, the direct resource, and simple prompt. The inspector also shows the icons for the server but does not display the other server metadata.

Breaking Changes

None.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Checklist

• I have read the MCP Documentation
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have added or updated documentation as needed

Additional context

[PederHP]

Nice one! I am curious by the way, if there is still a goal to align this EverythingServer with the reference one? If so, then it might make sense to mirror what they do at modelcontextprotocol/servers#3121.

[mikekistler]

@PederHP I did not realize there was a reference server in that repo. I'll investigate ...

[cliffhall]

@mikekistler thanks for the reminder, I had planned to add icons, was just trying to get the base functionality refactored to a more maintainable shape that utilizes the latest TS SDK apis.

[mikekistler]

I'm going to revise this to minimize the divergence from the reference implementation of the EverythingServer.

[mikekistler]

Flipping back out of draft now. The complex icons are now added to the existing Echo tool.

[halter73]

I assume we want to use the commit sha in case the icons move. It's supposed to be stable on the main branch, I'm fine with keeping it as is.