Register MCP servers (streamable_http, sse, or stdio). Their tools become available to attach to agents.
streamable_http
sse
stdio
Matches Letta CreateMcpServer.config.mcp_server_type.
CreateMcpServer.config.mcp_server_type
Used with the token below. Defaults to Authorization when a token is set.
Authorization
The Letta server runs this process; paths must exist on the API host.