McpApps
The MCP Apps extension (SEP-1865, stable revision 2026-01-26): tools whose results an interactive HTML view (ui:// resource) renders. The host side — sandbox, the ui/… message bridge — is ai-elements-mcp-apps; this is what the MCP client needs: the extension id, the negotiation and the view's media type.
Properties
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Client capabilities that advertise MCP Apps (§"Client (Host) Capabilities"); pass to McpClient.
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The MCP Apps protocol revision the host speaks in ui/initialize.