diff --git a/.github/plugin/marketplace.json b/.github/plugin/marketplace.json
index a31b710..5d05ec5 100644
--- a/.github/plugin/marketplace.json
+++ b/.github/plugin/marketplace.json
@@ -409,6 +409,42 @@
         "flowagent"
       ],
       "license": "MIT"
+    },
+    {
+      "name": "winui",
+      "source": {
+        "source": "github",
+        "repo": "microsoft/win-dev-skills",
+        "path": "plugins/winui/agent-plugin",
+        "ref": "v0.6.1",
+        "sha": "f94bab12f67f8670567c08b079dfd3179a1d15b4"
+      },
+      "description": "Agents and skills for WinUI 3 app development. Create new WinUI 3 desktop apps, convert from other frameworks (WPF, WinForms, Electron, Tauri, Flutter) to WinUI 3, or add features to existing WinUI 3 applications. Includes MSIX packaging, code signing, UI automation testing, and Windows App SDK guidance.",
+      "version": "0.6.1",
+      "author": {
+        "name": "Microsoft",
+        "url": "https://www.microsoft.com"
+      },
+      "homepage": "https://github.com/microsoft/win-dev-skills",
+      "repository": "https://github.com/microsoft/win-dev-skills",
+      "keywords": [
+        "windows",
+        "winui3",
+        "winui",
+        "xaml",
+        "windows app sdk",
+        "winrt",
+        "msix",
+        "packaging",
+        "code signing",
+        "microsoft store",
+        "wpf",
+        "winforms",
+        "uwp",
+        "desktop app",
+        "automation"
+      ],
+      "license": "MIT"
     }
   ]
 }
diff --git a/README.md b/README.md
index b137c9f..0c93efb 100644
--- a/README.md
+++ b/README.md
@@ -25,6 +25,8 @@ This marketplace also references plugins hosted in other repositories:
 
 - **[Power Platform Skills](https://github.com/microsoft/power-platform-skills)** — `power-pages`, `model-apps`, `mcp-apps`, `canvas-apps`, `code-apps-preview`, `mobile-app`, `power-automate`. Plugins for Power Platform development (Power Pages sites, model-driven and canvas apps, code apps, MCP App widgets, mobile apps, and Power Automate cloud flows).
 
+- **[WinUI](https://github.com/microsoft/win-dev-skills)** — Agents and skills for WinUI 3 app development. Create new WinUI 3 desktop apps, convert from other frameworks (WPF, WinForms, Electron, Tauri, Flutter) to WinUI 3, or add features to existing WinUI 3 applications. Includes MSIX packaging, code signing, UI automation testing, and Windows App SDK guidance.
+
 ## 🤝 Contributing
 
 We'd love your contributions! Please read our [Contributing Guide](CONTRIBUTING.md) for details on how to submit pull requests.