[github-actions]

What was found

VS Code 1.135 (released 2026-08-26) shipped three notable GitHub Copilot improvements:

1. Continue external agent sessions in VS Code — VS Code can now show agent sessions started in the Copilot app (or other external tools) and let you continue them inside the editor, controlled by the chat.agentSessions.showExternal setting.
2. /rubber-duck command (Experimental) — A direct /rubber-duck slash command is now available in VS Code, providing a second opinion from a complementary model to catch missed details and edge cases.
3. Detailed chat turn usage — Each chat turn now shows a per-model token breakdown (input, cached input, output), making it easy to understand context consumption across multi-model sessions.

What was updated

Page	Change
github-copilot-app.md	Added new "Continuing Copilot App Sessions in VS Code" section covering cross-surface session continuity and the chat.agentSessions.showExternal setting
agents-and-subagents.md	Updated the rubber-duck agent section to document the new direct /rubber-duck VS Code command alongside the existing CLI path
understanding-copilot-context.md	Added "Viewing per-turn token usage" subsection under Token Limits and Context Prioritization

All three pages had their lastUpdated date bumped to 2026-08-27.

Source

• VS Code 1.135 release notes: https://code.visualstudio.com/updates

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