--- 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 do in VS Code 1.135? Rubber Duck is an experimental built-in critic agent that gives a second opinion on the primary agent's plans, code, and tests using a different AI model than the one driving the session. It helps surface missed details or edge cases, and first appeared in GitHub Copilot CLI in April before shipping in VS Code 1.135, released August 26. _Developers evaluating AI code review agents can track feature rollouts like this on daily.dev._ ### Can I continue a GitHub Copilot or Claude agent session from another app inside VS Code? Yes, as of VS Code 1.135 the Sessions list can show recent Copilot or Claude agent sessions created in other applications, letting users select one to view the conversation and continue it directly in VS Code using their Copilot subscription. _Anyone juggling AI agent sessions across tools can follow workflow updates like this via daily.dev._ ### What is the Agent Host Protocol in VS Code and what does it enable? The Agent Host Protocol is the basis for VS Code's agent host, a dedicated process introduced in version 1.135 that runs agent harnesses and now lets multiple VS Code windows connect to the same agent session. Its Copilot agent is powered by the Copilot SDK, aligning behavior with Copilot CLI and other Copilot products. _Developers architecting multi-window AI agent workflows can keep up with protocol changes through 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":"2026-09-02T14:07:13.245Z","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 do in VS Code 1.135?","acceptedAnswer":{"@type":"Answer","text":"Rubber Duck is an experimental built-in critic agent that gives a second opinion on the primary agent's plans, code, and tests using a different AI model than the one driving the session. 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