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fix(spec): use ui/initialize and appInfo in transport handshake example #810

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fix(spec): use ui/initialize and appInfo in transport handshake example #810

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8 changes: 5 additions & 3 deletions specification/2026-01-26/apps.mdx
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Original file line number Diff line number Diff line change
Expand Up @@ -458,11 +458,13 @@ function onNotification(method: string, handler: (params: any) => void) {
}


const initializeResult = await sendRequest("initialize", {
capabilities: {},
clientInfo: {name: "My UI", version: "1.0.0"},
// The View <-> Host handshake is `ui/initialize` (not MCP's `initialize`)
const initializeResult = await sendRequest("ui/initialize", {
appCapabilities: {availableDisplayModes: ["inline"]},
appInfo: {name: "My UI", version: "1.0.0"},
protocolVersion: "2026-01-26",
});
sendNotification("ui/notifications/initialized", {});
```

Hosts act as MCP servers (that can proxy the actual MCP server), receiving and handling requests from UI iframes.
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8 changes: 5 additions & 3 deletions specification/draft/apps.mdx
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Original file line number Diff line number Diff line change
Expand Up @@ -477,11 +477,13 @@ function onNotification(method: string, handler: (params: any) => void) {
}


const initializeResult = await sendRequest("initialize", {
capabilities: {},
clientInfo: {name: "My UI", version: "1.0.0"},
// The View <-> Host handshake is `ui/initialize` (not MCP's `initialize`)
const initializeResult = await sendRequest("ui/initialize", {
appCapabilities: {availableDisplayModes: ["inline"]},
appInfo: {name: "My UI", version: "1.0.0"},
protocolVersion: "2025-06-18",
});
sendNotification("ui/notifications/initialized", {});
```

Hosts act as MCP servers (that can proxy the actual MCP server), receiving and handling requests from UI iframes.
Expand Down