ExperimentalOptionalstdioAgent supports [McpServer::Stdio].
Optional. Omitted or null both mean the agent does not advertise support.
Supplying {} means the agent supports stdio MCP server transports.
OptionalhttpAgent supports [McpServer::Http].
Optional. Omitted or null both mean the agent does not advertise support.
Supplying {} means the agent supports HTTP MCP server transports.
Optional ExperimentalacpUNSTABLE
This capability is not part of the spec yet, and may be removed or changed at any point.
Agent supports [McpServer::Acp].
Optional. Omitted or null both mean the agent does not advertise support.
Supplying {} means the agent supports ACP MCP server transports.
Optional_The _meta property is reserved by ACP to allow clients and agents to attach additional metadata to their interactions. Implementations MUST NOT make assumptions about values at these keys.
See protocol docs: Extensibility
MCP capabilities supported by the agent for session lifecycle requests.