package github
import (
"context"
ghcontext "github.com/github/github-mcp-server/pkg/context"
"github.com/modelcontextprotocol/go-sdk/mcp"
)
// mcpAppsExtensionKey is the capability extension key that clients use to
// advertise MCP Apps UI support.
const mcpAppsExtensionKey = "io.modelcontextprotocol/ui"
// MCPAppMIMEType is the MIME type for MCP App UI resources.
const MCPAppMIMEType = "text/html;profile=mcp-app"
// clientSupportsUI reports whether the MCP client that sent this request
// supports MCP Apps UI rendering.
// It checks the context first (set by HTTP/stateless servers from stored
// session capabilities), then falls back to the go-sdk Session (for stdio).
func clientSupportsUI(ctx context.Context, req *mcp.CallToolRequest) bool {
// Check context first (works for HTTP/stateless servers)
if supported, ok := ghcontext.HasUISupport(ctx); ok {
return supported
}
// Fall back to go-sdk session (works for stdio/stateful servers)
if req != nil && req.Session != nil {
params := req.Session.InitializeParams()
if params != nil && params.Capabilities != nil {
_, hasUI := params.Capabilities.Extensions[mcpAppsExtensionKey]
return hasUI
}
}
return false
}
