VS Code 1.135.0

VS Code 1.135.0 dropped on August 26, 2026, and this month is all about the Agents experience. The headline is the new agent host that lets you hold one Copilot or Claude agent session across several VS Code windows, plus a reworked Agents window layout and clearer chat usage reporting.

Agent Upgrades

• Agent host — A dedicated process runs Copilot and Claude agent harnesses based on the Agent Host Protocol, so a single session can be opened and continued across multiple VS Code windows. The Copilot harness now uses the Copilot SDK for consistent behavior.
• External agent sessions — Recent Copilot or Claude sessions started in other applications now appear in the Sessions list. Pick one to view the transcript and continue it in VS Code with your Copilot subscription, controlled by the chat.agentSessions.showExternal setting.
• Rubber Duck (experimental) — A complementary model can review the main agent's work through the /rubber-duck command, surfacing missed details and edge cases before you commit.

Agents Window Polish

• Single-pane layout by default — The side-by-side details pane from 1.134 is now the default on desktop, with inline diffs kicking in when the pane is narrow and a decluttered action bar.
• Simpler session controls — The session title sits prominently, actions move into an overflow menu, and live pills above the chat input show changes, pull requests, issues, and artifacts.
• Chat sticky scroll — An experimental editor-style sticky scroll keeps the current prompt visible while reviewing long responses.

Usage & Stability

• Detailed chat usage — Hover the chat response footer to see a per-model breakdown of input, cached input, and output tokens for each turn.
• Sandboxing rolled back — Local agent harness sandboxing returned to a 0% default rollout so the team can focus on the agent host; it remains an opt-in UI toggle.
• Memory leak fixes — Patches landed for leaks in the markers table, main thread documents and editors, and the settings preview indicator.

Run Check for Updates inside VS Code, or grab the build from code.visualstudio.com.