--- title: Rubber Duck in GitHub Copilot CLI | daily.dev description: GitHub Copilot CLI introduces 'Rubber Duck', an experimental AI review feature that uses a second model from a different family to critique the primary agent's... canonical: https://daily.dev/posts/rubber-duck-in-github-copilot-cli-h1kpggec0 twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Rubber Duck in GitHub Copilot CLI | daily.dev og:description: GitHub Copilot CLI introduces 'Rubber Duck', an experimental AI review feature that uses a second model from a different family to critique the primary agent's... og:url: https://daily.dev/posts/rubber-duck-in-github-copilot-cli-h1kpggec0 og:image: https://api.daily.dev/og/posts/h1kPGgEc0.png og:image:alt: Rubber Duck in GitHub Copilot CLI 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. # Rubber Duck in GitHub Copilot CLI **[The Art of Simplicity](https://daily.dev/sources/bartwullems)** · 3 min read · 1 upvotes · 1 comments ## Summary GitHub Copilot CLI introduces 'Rubber Duck', an experimental AI review feature that uses a second model from a different family to critique the primary agent's plans and code. When using Claude as the orchestrator, Rubber Duck runs on GPT-5.4 to bring genuinely different blind spots. It activates automatically at three checkpoints: after drafting a plan, after complex implementations, and after writing tests. Users can also trigger it manually at any point. It's optimized for complex multi-file tasks and works best when invoked before approving a plan to catch structural issues early. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Rubber Duck in GitHub Copilot CLI now supports more models](https://daily.dev/posts/rubber-duck-in-github-copilot-cli-now-supports-more-models-d96bkcovt) · GitHub Changelog · 1 upvotes · 0 comments --- Tags: [#github](https://daily.dev/tags/github), [#ai-coding](https://daily.dev/tags/ai-coding), [#agentic-ai](https://daily.dev/tags/agentic-ai) [View this post on daily.dev](https://daily.dev/posts/rubber-duck-in-github-copilot-cli-h1kpggec0) ```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":"Rubber Duck in GitHub Copilot CLI","url":"https://daily.dev/posts/rubber-duck-in-github-copilot-cli-h1kpggec0","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/rubber-duck-in-github-copilot-cli-h1kpggec0"},"datePublished":"2026-06-06T07:01:57.124Z","dateModified":"2026-06-06T07:02:17.477Z","description":"GitHub Copilot CLI introduces 'Rubber Duck', an experimental AI review feature that uses a second model from a different family to critique the primary agent's...","image":"https://media.daily.dev/image/upload/s--OHB84bZF--/f_auto/v1722860399/public/Placeholder%2010","thumbnailUrl":"https://media.daily.dev/image/upload/s--OHB84bZF--/f_auto/v1722860399/public/Placeholder%2010","isAccessibleForFree":true,"articleSection":"The Art of Simplicity","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":"The Art of Simplicity","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/52b68c70636d44f0901ae7cd107c9438","url":"https://daily.dev/sources/bartwullems"},"commentCount":1,"discussionUrl":"https://daily.dev/posts/rubber-duck-in-github-copilot-cli-h1kpggec0","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":1},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":1}],"keywords":"github,ai-coding,agentic-ai","timeRequired":"PT3M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"The Art of Simplicity","item":"https://daily.dev/sources/bartwullems"},{"@type":"ListItem","position":3,"name":"Rubber Duck in GitHub Copilot CLI"}]} ```