open_canvas: Invalid input error when 'scope' field is missing from editor canvas

[PhillyUrbs]

Short summary

open_canvas for the editor canvas type returns an invalid input error when the scope field is not provided, even though it is not documented as required.

Affected version or release

1.0.64-0

Installation context

GitHub Copilot CLI chat session (general chat, not tied to a project session)

What happened?

When calling open_canvas with canvasId: "editor" and a valid path in the input, the tool returned:

dDe: Invalid input for canvas "editor" open input: (root): "scope" is a required property. Inspect the canvas declaration for the expected input schema.

The canvas did not open. No scope field is listed or described in the canvas documentation or tool description.

Steps to reproduce

1. From a general chat session (not a project session), call open_canvas with:

{
  "canvasId": "editor",
  "instanceId": "my-canvas-instance",
  "input": {
    "path": "C:\\Users\\<username>\\.copilot\\session-state\\<session-id>\\files\\example.md"
  }
}

2. Observe the error response.

Expected behavior

The editor canvas should open with the specified file, or the error message should clearly indicate that scope is a required field and document valid values (e.g., user, project, session).

Additional context

• The list_canvas_capabilities tool would reveal the schema, but the error message itself gives no hint.
• The open_canvas tool description does not mention a required scope field for the editor canvas.
• Surfacing required fields in the error message or tool description would prevent this confusion.