Enhance client support checks for MCP Apps UI rendering #2051
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| Original file line number | Diff line number | Diff line change | ||||||||||||||||||
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| @@ -1,27 +1,32 @@ | ||||||||||||||||||||
| package github | ||||||||||||||||||||
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| import ( | ||||||||||||||||||||
| "context" | ||||||||||||||||||||
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| ghcontext "github.com/github/github-mcp-server/pkg/context" | ||||||||||||||||||||
| "github.com/modelcontextprotocol/go-sdk/mcp" | ||||||||||||||||||||
| ) | ||||||||||||||||||||
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| // mcpAppsExtensionKey is the capability extension key that clients use to | ||||||||||||||||||||
| // advertise MCP Apps UI support. | ||||||||||||||||||||
| const mcpAppsExtensionKey = "io.modelcontextprotocol/ui" | ||||||||||||||||||||
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| // 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) | ||||||||||||||||||||
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There was a problem hiding this comment. Is this a legit issue or not @mattdholloway? Will we only support this in remote and set the context on the request there, or should this also be supported in STDIO? |
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| 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 | ||||||||||||||||||||
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| } | ||||||||||||||||||||
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This helper now decides whether to add the UI extension by matching on
clientName(VS Code names). Since UI support detection has been refactored away from client-name matching, consider makingcreateMCPRequestWithSessionaccept an explicit*mcp.ClientCapabilities(or auiSupportedbool) so tests don’t implicitly rely on client-name heuristics and can set capabilities directly.