modelcontextprotocol/ext-apps
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lib: add capabilities & version getters (#24)

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* add App{,Bridge}.get{App,Host}{Version,Capabilities}()

* Add App.{oncalltool,onlisttools}
This commit is contained in:
Olivier Chafik 2025-11-25 04:05:33 +00:00 • committed by GitHub
commit 8ac79a9731
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1 changed files with 48 additions and 4 deletions
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17
src/app-bridge.ts
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@ -63,12 +63,13 @@ type HostOptions = ProtocolOptions;
export const SUPPORTED_PROTOCOL_VERSIONS = [LATEST_PROTOCOL_VERSION];
type RequestExtra = Parameters<
type RequestHandlerExtra = Parameters<
Parameters<AppBridge["setRequestHandler"]>[1]
>[1];
export class AppBridge extends Protocol<Request, Notification, Result> {
private _appCapabilities?: McpUiAppCapabilities;
private _appInfo?: Implementation;
constructor(
private _client: Client,
@ -88,7 +89,14 @@ export class AppBridge extends Protocol<Request, Notification, Result> {
});
}
onping?: (params: PingRequest["params"], extra: RequestExtra) => void;
getAppCapabilities(): McpUiAppCapabilities | undefined {
return this._appCapabilities;
}
getAppVersion(): Implementation | undefined {
return this._appInfo;
}
onping?: (params: PingRequest["params"], extra: RequestHandlerExtra) => void;
set onsizechange(
callback: (params: McpUiSizeChangeNotification["params"]) => void,
@ -114,7 +122,7 @@ export class AppBridge extends Protocol<Request, Notification, Result> {
set onmessage(
callback: (
params: McpUiMessageRequest["params"],
extra: RequestExtra,
extra: RequestHandlerExtra,
) => Promise<McpUiMessageResult>,
) {
this.setRequestHandler(
@ -127,7 +135,7 @@ export class AppBridge extends Protocol<Request, Notification, Result> {
set onopenlink(
callback: (
params: McpUiOpenLinkRequest["params"],
extra: RequestExtra,
extra: RequestHandlerExtra,
) => Promise<McpUiOpenLinkResult>,
) {
this.setRequestHandler(
@ -168,6 +176,7 @@ export class AppBridge extends Protocol<Request, Notification, Result> {
const requestedVersion = request.params.protocolVersion;
this._appCapabilities = request.params.appCapabilities;
this._appInfo = request.params.appInfo;
const protocolVersion = SUPPORTED_PROTOCOL_VERSIONS.includes(
requestedVersion,