add avatar resource domain

Author: tommaso-moro

pkg/github/ui_resources.go

@@ -0,0 +1,43 @@
+package github
+
+import (
+	"context"
+
+	"github.com/modelcontextprotocol/go-sdk/mcp"
+)
+
+// RegisterUIResources registers MCP App UI resources with the server.
+// These are static resources (not templates) that serve HTML content for
+// MCP App-enabled tools.
+func RegisterUIResources(s *mcp.Server) {
+	// Register the get_me UI resource
+	s.AddResource(
+		&mcp.Resource{
+			URI:         GetMeUIResourceURI,
+			Name:        "get_me_ui",
+			Description: "MCP App UI for the get_me tool",
+			MIMEType:    "text/html",
+		},
+		func(_ context.Context, _ *mcp.ReadResourceRequest) (*mcp.ReadResourceResult, error) {
+			return &mcp.ReadResourceResult{
+				// MCP Apps UI metadata - CSP configuration to allow loading GitHub avatars
+				// See: https://github.com/modelcontextprotocol/ext-apps/blob/main/specification/draft/apps.mdx
+				Meta: mcp.Meta{
+					"ui": map[string]any{
+						"csp": map[string]any{
+							// Allow loading images from GitHub's avatar CDN
+							"resourceDomains": []string{"https://avatars.githubusercontent.com"},
+						},
+					},
+				},
+				Contents: []*mcp.ResourceContents{
+					{
+						URI:      GetMeUIResourceURI,
+						MIMEType: "text/html",
+						Text:     GetMeUIHTML,
+					},
+				},
+			}, nil
+		},
+	)
+}