--- title: Visual Studio Code 1.135 introduces Rubber Duck agent description: Visual Studio Code 1.135, released August 26, adds an experimental Rubber Duck agent that provides a second opinion on the primary AI agent's plans, code, and... canonical: https://daily.dev/posts/visual-studio-code-1-135-introduces-rubber-duck-agent-ovolsb5rd twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Visual Studio Code 1.135 introduces Rubber Duck agent | daily.dev og:description: Visual Studio Code 1.135, released August 26, adds an experimental Rubber Duck agent that provides a second opinion on the primary AI agent's plans, code, and... og:url: https://daily.dev/posts/visual-studio-code-1-135-introduces-rubber-duck-agent-ovolsb5rd og:image: https://api.daily.dev/og/posts/ovOLSB5rD.png og:image:alt: Visual Studio Code 1.135 introduces Rubber Duck agent og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Visual Studio Code 1.135 introduces Rubber Duck agent **[InfoWorld](https://daily.dev/sources/infoworld)** · 2 min read · 2 upvotes · 0 comments ## Summary Visual Studio Code 1.135, released August 26, adds an experimental Rubber Duck agent that provides a second opinion on the primary AI agent's plans, code, and tests using a different underlying model, a feature that first debuted in GitHub Copilot CLI in April. The release also lets users connect to the same agent session from multiple VS Code windows via the new agent host built on the Agent Host Protocol, shows recent Copilot or Claude agent sessions created in other applications for continuation in VS Code, redesigns the chat response footer with per-model token usage breakdowns, and improves the Agents window UX with a streamlined side layout and simplified session controls. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### What does the Rubber Duck agent in VS Code 1.135 do? Rubber Duck is an experimental built-in critic agent introduced in VS Code 1.135 that reviews the primary agent's plans, code, and tests using a different AI model than the one driving the session, surfacing missed details or edge cases. It first appeared in GitHub Copilot CLI in April before being added to VS Code. _Developers evaluating multi-model review workflows can track agent feature rollouts like this on daily.dev._ ### Can I continue a Copilot or Claude agent session from another app inside VS Code 1.135? Yes, the Sessions list in VS Code 1.135 shows recent Copilot or Claude agent sessions created in other applications, and selecting one lets you view the conversation and continue it in VS Code using your Copilot subscription. This works alongside the new agent host feature that allows connecting to the same session from multiple VS Code windows. _Anyone juggling agent sessions across tools can follow VS Code and Copilot updates on daily.dev._ ### What protocol powers the new multi-window agent sessions in VS Code 1.135? The agent host in VS Code 1.135 runs agent harnesses in a dedicated process based on the Agent Host Protocol, letting users connect to the same agent session from multiple VS Code windows. Its Copilot agent is powered by the Copilot SDK, aligning behavior with Copilot CLI, the standalone Copilot app, and other Copilot products. _Teams standardizing on Copilot's agent tooling can keep up with these protocol changes via daily.dev._ --- Tags: [#github](https://daily.dev/tags/github), [#ai-agents](https://daily.dev/tags/ai-agents), [#vscode](https://daily.dev/tags/vscode) [View this post on daily.dev](https://daily.dev/posts/visual-studio-code-1-135-introduces-rubber-duck-agent-ovolsb5rd) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Visual Studio Code 1.135 introduces Rubber Duck agent","url":"https://daily.dev/posts/visual-studio-code-1-135-introduces-rubber-duck-agent-ovolsb5rd","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/visual-studio-code-1-135-introduces-rubber-duck-agent-ovolsb5rd"},"datePublished":"2026-08-27T23:51:39.530Z","dateModified":"2026-09-13T20:11:24.977Z","description":"Visual Studio Code 1.135, released August 26, adds an experimental Rubber Duck agent that provides a second opinion on the primary AI agent's plans, code, and...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/f8bd08dde8acfc45129f471e4501e79f?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/f8bd08dde8acfc45129f471e4501e79f?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"InfoWorld","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"InfoWorld","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/bf6d68a999064029b0bb09aa6268f1f3","url":"https://daily.dev/sources/infoworld"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/visual-studio-code-1-135-introduces-rubber-duck-agent-ovolsb5rd","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":2},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"github,ai-agents,vscode","timeRequired":"PT2M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"InfoWorld","item":"https://daily.dev/sources/infoworld"},{"@type":"ListItem","position":3,"name":"Visual Studio Code 1.135 introduces Rubber Duck agent"}]} {"@context":"https://schema.org","@type":"FAQPage","@id":"https://daily.dev/posts/visual-studio-code-1-135-introduces-rubber-duck-agent-ovolsb5rd#faq","mainEntity":[{"@type":"Question","name":"What does the Rubber Duck agent in VS Code 1.135 do?","acceptedAnswer":{"@type":"Answer","text":"Rubber Duck is an experimental built-in critic agent introduced in VS Code 1.135 that reviews the primary agent's plans, code, and tests using a different AI model than the one driving the session, surfacing missed details or edge cases. 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