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fix: preserve experimental capability settings #721

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Merged
idosal merged 1 commit into from
Jul 22, 2026
+81 −27
Merged

fix: preserve experimental capability settings #721

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8 changes: 4 additions & 4 deletions specification/draft/apps.mdx
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Original file line number Diff line number Diff line change
Expand Up @@ -548,8 +548,8 @@ When the View sends an `ui/initialize` request to the Host, it MUST include its

```typescript
interface McpUiAppCapabilities {
/** Experimental features (structure TBD). */
experimental?: {};
/** Experimental features keyed by identifier. */
experimental?: Record<string, object>;
/** App exposes MCP-style tools that the host can call. */
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tools?: {
/** App supports tools/list_changed notifications. */
Expand Down Expand Up @@ -677,8 +677,8 @@ interface SupportedContentBlockModalities {
}

interface HostCapabilities {
/** Experimental features (structure TBD). */
experimental?: {};
/** Experimental features keyed by identifier. */
experimental?: Record<string, object>;
/** Host supports opening external URLs. */
openLinks?: {};
/** Host supports file downloads via ui/download-file. */
Expand Down
10 changes: 9 additions & 1 deletion src/app-bridge.test.ts
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Expand Up @@ -45,6 +45,9 @@ function createMockClient(
const testHostInfo = { name: "TestHost", version: "1.0.0" };
const testAppInfo = { name: "TestApp", version: "1.0.0" };
const testHostCapabilities: McpUiHostCapabilities = {
experimental: {
"com.example/host-extension": { version: 1 },
},
openLinks: {},
serverTools: {},
logging: {},
Expand Down Expand Up @@ -97,7 +100,12 @@ describe("App <-> AppBridge integration", () => {
});

it("Bridge receives app info and capabilities after initialization", async () => {
const appCapabilities = { tools: { listChanged: true } };
const appCapabilities = {
experimental: {
"com.example/app-extension": { version: 1 },
},
tools: { listChanged: true },
};
app = new App(testAppInfo, appCapabilities, { autoResize: false });

await bridge.connect(bridgeTransport);
Expand Down
60 changes: 48 additions & 12 deletions src/generated/schema.json
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22 changes: 16 additions & 6 deletions src/generated/schema.ts
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8 changes: 4 additions & 4 deletions src/spec.types.ts
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Expand Up @@ -492,8 +492,8 @@ export interface McpUiRequestTeardownNotification {
* @see {@link McpUiInitializeResult `McpUiInitializeResult`} for the initialization result that includes these capabilities
*/
export interface McpUiHostCapabilities {
/** @description Experimental features (structure TBD). */
experimental?: {};
/** @description Experimental features keyed by identifier. */
experimental?: Record<string, object>;
/** @description Host supports opening external URLs. */
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openLinks?: {};
/** @description Host supports file downloads via ui/download-file. */
Expand Down Expand Up @@ -536,8 +536,8 @@ export interface McpUiHostCapabilities {
* @see {@link McpUiInitializeRequest `McpUiInitializeRequest`} for the initialization request that includes these capabilities
*/
export interface McpUiAppCapabilities {
/** @description Experimental features (structure TBD). */
experimental?: {};
/** @description Experimental features keyed by identifier. */
experimental?: Record<string, object>;
/** @description App exposes MCP-style tools that the host can call. */
tools?: {
/** @description App supports tools/list_changed notifications. */
Expand Down
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