GitHub Copilot app is a desktop application for agentic development that provides a centralized workspace to manage AI agents across parallel workflows, integrate with GitHub issues and pull requests, and handle the entire development lifecycle without switching between terminals, IDEs, and browser tabs. The app is built on top of GitHub Copilot CLI and integrates directly with GitHub repositories. It supports Windows, macOS, and Linux, and requires a paid GitHub Copilot subscription. This article explains what the app does, how to access it, and its current limitations.

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GitHub Copilot CLI—GitHub's AI assistant for the terminal—introduced an experimental feature called Rubber Duck that pairs your primary AI model with an independent reviewer from a completely different AI vendor. The goal is to catch early planning mistakes before they compound into harder-to-fix downstream errors, a known weakness of single-model AI agents. In performance testing on real-world coding problems, combining Claude Sonnet with Rubber Duck closed 74.7% of the performance gap between Sonnet and the more capable Opus tier.

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VS Code transitioned to a weekly stable release schedule starting with version 1.111 in March 2026, moving away from its previous monthly cadence. Versions 1.112 and 1.113 are the second and third releases under this new schedule, introducing integrated browser debugging, MCP (Model Context Protocol) server sandboxing, Copilot CLI agent permissions, and chat workflow improvements. This article details the most significant technical changes in both releases.

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