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spec: add missing HostCapabilities fields (#653)

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Cameron Yick 2026-07-07 14:02:07 -04:00 • committed by GitHub
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39
specification/draft/apps.mdx
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@ -659,6 +659,22 @@ Example:
They describe the features and capabilities that the Host supports. They describe the features and capabilities that the Host supports.
```typescript ```typescript
/** Content block modalities that the host supports for a given capability. */
interface SupportedContentBlockModalities {
/** Host supports text content blocks. */
text?: {};
/** Host supports image content blocks. */
image?: {};
/** Host supports audio content blocks. */
audio?: {};
/** Host supports resource content blocks. */
resource?: {};
/** Host supports resource link content blocks. */
resourceLink?: {};
/** Host supports structured content. */
structuredContent?: {};
}
interface HostCapabilities { interface HostCapabilities {
/** Experimental features (structure TBD). */ /** Experimental features (structure TBD). */
experimental?: {}; experimental?: {};
@ -678,14 +694,6 @@ interface HostCapabilities {
}; };
/** Host accepts log messages. */ /** Host accepts log messages. */
logging?: {}; logging?: {};
/**
* Host supports LLM sampling (sampling/createMessage) from the view.
* Mirrors MCP ClientCapabilities.sampling so hosts can pass it through.
*/
sampling?: {
/** Host supports tool use via `tools` and `toolChoice` params (SEP-1577). */
tools?: {};
};
/** Sandbox configuration applied by the host. */ /** Sandbox configuration applied by the host. */
sandbox?: { sandbox?: {
/** Permissions granted by the host (camera, microphone, geolocation, clipboard-write). */ /** Permissions granted by the host (camera, microphone, geolocation, clipboard-write). */
@ -707,6 +715,21 @@ interface HostCapabilities {
baseUriDomains?: string[]; baseUriDomains?: string[];
}; };
}; };
/**
* Host accepts context updates (ui/update-model-context) to be included in
* the model's context for future turns.
*/
updateModelContext?: SupportedContentBlockModalities;
/** Host supports receiving content messages (ui/message) from the view. */
message?: SupportedContentBlockModalities;
/**
* Host supports LLM sampling (sampling/createMessage) from the view.
* Mirrors MCP ClientCapabilities.sampling so hosts can pass it through.
*/
sampling?: {
/** Host supports tool use via `tools` and `toolChoice` params (SEP-1577). */
tools?: {};
};
} }
``` ```