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
The current cursor position.
The session ID for this notification.
The URI of the focused document.
The version number of the document.
The portion of the file currently visible in the editor viewport.
Notification sent when a file becomes the active editor tab.