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docs(mcp): clarify the UI capability is a host-level, per-session setting

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Note at the advertising site that io.modelcontextprotocol/ui tracks the instance-wide apps setting
and per-tenant policy is enforced downstream, so the rationale lives with the code.
This commit is contained in:
Dustin Healy 2026-06-30 08:48:53 -07:00
parent d87c12b7ec
commit ea5600a4b1
1 changed files with 2 additions and 2 deletions
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4
packages/api/src/mcp/connection.ts
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@ -1266,8 +1266,8 @@ export class MCPConnection extends EventEmitter {
if (params.oauthTokens) {
this.oauthTokens = params.oauthTokens;
}
// Advertise the UI capability so servers expose app-enhanced tools; suppressed when MCP Apps
// are disabled by config.
// io.modelcontextprotocol/ui is a per-session host capability, so it tracks the instance-wide
// apps setting; per-tenant apps policy is enforced downstream, not renegotiated per request.
const appsEnabled = params.enableApps !== false;
const capabilities: ClientCapabilities = appsEnabled
? { extensions: { 'io.modelcontextprotocol/ui': { mimeTypes: [RESOURCE_MIME_TYPE] } } }