Agent Mode cannot edit Eclipse Project Linked Resources (treated as outside workspace)

Feedback source

None

GitHub Copilot plugin version

0.14.0.202512112209

Eclipse IDE and version

Eclipse IDE for Embedded C/C++ Developers (includes Incubating components) Version: 2025-06 (4.36.0) Build id: 20250605-1316

Platform

Microsoft Windows NT 10.0.22631.0
x64

Steps to reproduce

1. Create a linked resource pointing to an external directory (outside the workspace):
   Window → Preferences → General → Workspace → Linked Resources → New
2. Create (or open) a project
3. Add a Linked Folder pointing to the linked resource variable:
   Project → New → Folder → Advanced → Link to alternate location (Lined Folder) → Variables... → choose the created variable from step 1.
4. Open a file in that linked folder
5. In Copilot Chat (Agent Mode), request a small change
6. Approve the Agent’s plan (if prompted)

Logs (optional)

No response

Expected behavior

Copilot Agent Mode treats Linked Resources as workspace files and applies edits directly (with normal confirmation flow).
Eclipse supports external sources via Linked Resources by design, and projects build/edit normally in this setup.
GitHub’s own Agent Mode announcements for Eclipse state the Agent applies changes via tools scoped to the workspace, which likely explains the strict boundary—but Linked Resources are conceptually inside the project workspace from the IDE’s perspective.

Actual behavior

Copilot Agent responds that it cannot edit files outside the active Eclipse workspace, naming the linked file path (e.g., C:\XXX\yyy.h).
No changes are applied, even though the file is open in the editor and is a valid Eclipse project resource.
Error like this:

I am unable to edit files outside the active Eclipse workspace. The file c:\XXX\yyy.h is not accessible for direct modification.
To proceed, please move the file into your Eclipse workspace, or let me know if you want the translated and revised content so you can manually copy it. I can provide the updated code for you to paste into your file if needed.

or this:

It appears the file path I used does not exist in the workspace. The file you are editing is located at: c:\XXX\yyy.h

Additional information

No response

No source files or tests are named. Start by reproducing the linked-resource setup in Eclipse 2025-06 on Windows and trace how Agent Mode determines whether an open project resource is inside the workspace. Done means files reached through Eclipse Linked Resources can be edited through the normal Agent Mode confirmation flow.