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Replace client capability negotiation from extensions to experimental #232

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Replace client capability negotiation from extensions to experimental #232

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4 changes: 2 additions & 2 deletions specification/draft/apps.mdx
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Original file line number Diff line number Diff line change
Expand Up @@ -1252,7 +1252,7 @@ Clients advertise MCP Apps support in the initialize request using the extension
"params": {
"protocolVersion": "2024-11-05",
"capabilities": {
"extensions": {
"experimental": {
"io.modelcontextprotocol/ui": {
"mimeTypes": ["text/html;profile=mcp-app"]
}
Expand Down Expand Up @@ -1281,7 +1281,7 @@ Servers SHOULD check client (host would-be) capabilities before registering UI-e

```typescript
const hasUISupport =
clientCapabilities?.extensions?.["io.modelcontextprotocol/ui"]?.mimeTypes?.includes("text/html;profile=mcp-app");
clientCapabilities?.experimental?.["io.modelcontextprotocol/ui"]?.mimeTypes?.includes("text/html;profile=mcp-app");

if (hasUISupport) {
// Register tools with UI templates
Expand Down
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