The CLAUDE_CODE_ENABLE_XAA=1 environment variable is required to use XAA features. Without it, servers configured with oauth.xaa will error on startup.
The --xaa, --client-id, and --client-secret flags are only supported for HTTP/SSE MCP transports and will be ignored for stdio.
The compact line prefix format and trusted device enrollment are behind feature flags and may not be active for all users yet.
