fix: update UIResourceRenderer to use EmbeddedResource type

[aharvard]

Problem

While implementing the UIResourceRenderer component in a client application, I discovered that the component was using the generic Resource type from the MCP SDK instead of the more specific EmbeddedResource type. This caused type mismatches when working with the MCP EmbeddedResource schema.

Root Cause

The UIResourceRenderer component was originally typed to accept Partial<Resource>, but according to the MCP specification, embedded resources in prompts and tool call results should use the EmbeddedResource type, which has a different structure:

• Resource is the base resource type used for resource listings and operations
• EmbeddedResource is specifically designed for resources that are embedded into prompts or tool call results, with the structure:

  interface EmbeddedResource {
    type: "resource";
    resource: TextResourceContents | BlobResourceContents;
    _meta?: { [key: string]: unknown };
    annotations?: Annotations;
  }

Changes Made

• Updated import statement to use EmbeddedResource instead of Resource from @modelcontextprotocol/sdk/types.js
• Changed UIResourceRendererProps.resource type from Partial<Resource> to Partial<EmbeddedResource>
• Updated getContentType function parameter type from Partial<Resource> to Partial<EmbeddedResource['resource']>

Impact

This change ensures proper type alignment with the MCP specification for embedded resources, providing better type safety and preventing runtime errors when the component receives properly typed EmbeddedResource objects from MCP tool call results or prompts.

Testing

The component maintains backward compatibility as EmbeddedResource contains the necessary resource property that the component logic depends on, while providing more accurate typing for the expected MCP protocol usage.

[liady]

Good catch, @aharvard , thanks!

[Copilot]

Pull Request Overview

This PR fixes a type mismatch in the UIResourceRenderer component by updating it to use the more specific EmbeddedResource type instead of the generic Resource type, aligning with the MCP specification for embedded resources in prompts and tool call results.

• Updates import to use EmbeddedResource from MCP SDK
• Changes component props and function parameter types to use the correct embedded resource structure
• Improves type safety for MCP protocol compliance