MCP Apps

MCP Apps: An MCP extension in which a tool points to a ui:// resource the host renders as a sandboxed View. Example: Vercel MCP renders deployments as an MCP Apps card in ChatGPT. Next in the glossary is MCP client: The connector inside a host application that holds one connection to one MCP server.

Definition

An MCP extension in which a tool points to a ui:// resource the host renders as a sandboxed View.

Example, with source

Vercel MCP renders deployments as an MCP Apps card in ChatGPT. (vercel.com, read 4 November 2026)

Where it appears on this site

• MCP
• Tool descriptions and agent success

Neighbouring terms

• HTTP+SSE transport: The older MCP HTTP transport with a separate SSE endpoint, deprecated since 2025-03-26 and reclassified Deprecated in 2026-07-28.
• MCP client: The connector inside a host application that holds one connection to one MCP server.
• MCP gateway: A proxy in front of MCP servers that authenticates callers, injects upstream credentials, filters tools and logs calls.