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VS Code 1.135 ships a Rubber Duck critic agent and cross-window agent sessions
The 1.135 release, out 2026-08-26, adds Rubber Duck, an experimental built-in critic that gives a second opinion on plans, code and tests using a different model than the primary agent, after debuting in GitHub Copilot CLI in April 2026. The agent host now runs on the Agent Host Protocol with the Copilot SDK, letting one agent session be attached from multiple VS Code windows, and the Sessions list surfaces recent Copilot or Claude sessions started in other applications for continuation inside VS Code. The chat response footer now breaks tokens down per model into input, cached input and output.
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