MCP Channel

Stability 1.2Release candidate

No further breaking changes are anticipated, but feedback may still require them.

About the stability index

Reference for the optional mcp:// side-channel. See the MCP Channel specification for routing, lifecycle, and normative requirements.

Wire Surface

The channel carries MCP JSON-RPC requests, responses, and notifications verbatim. AHP does not redeclare those upstream wire shapes, so there are no AHP JSON Schemas for this page.

The AHP-defined surface consists of the top-level channel routing key and capability advertisements on the owning customization. The currently defined capability set is AhpMcpUiHostCapabilities.