diff --git a/.github/plugin/marketplace.json b/.github/plugin/marketplace.json
index a31b710..65e8f94 100644
--- a/.github/plugin/marketplace.json
+++ b/.github/plugin/marketplace.json
@@ -148,6 +148,33 @@
       ],
       "license": "MIT"
     },
+    {
+      "name": "fixlab",
+      "source": {
+        "source": "github",
+        "repo": "microsoft/FixLab"
+      },
+      "description": "Evidence-backed defect diagnosis, repair, and validation for React and .NET repositories.",
+      "version": "0.7.4",
+      "author": {
+        "name": "MonaDevAI",
+        "url": "https://github.com/MonaDevAI"
+      },
+      "homepage": "https://github.com/microsoft/FixLab",
+      "repository": "https://github.com/microsoft/FixLab",
+      "keywords": [
+        "testing",
+        "validation",
+        "github-copilot",
+        "ai-agent",
+        "developer-tools",
+        "react",
+        "dotnet",
+        "playwright",
+        "pull-requests"
+      ],
+      "license": "MIT"
+    },
     {
       "name": "fabric-skills",
       "source": {
@@ -412,3 +439,4 @@
     }
   ]
 }
+
diff --git a/README.md b/README.md
index b137c9f..79257c3 100644
--- a/README.md
+++ b/README.md
@@ -19,6 +19,8 @@ This marketplace also references plugins hosted in other repositories:
 
 - **[Azure DevOps Copilot Plugin](https://github.com/microsoft/azure-devops-copilot-plugin)** — Bring Azure DevOps work-item, repository, and pull-request workflows into GitHub Copilot.
 
+- **[FixLab](https://github.com/microsoft/FixLab)** — Evidence-backed defect diagnosis, repair, and validation for React and .NET repositories.
+
 - **[Microsoft Skills for Fabric](https://github.com/microsoft/skills-for-fabric)** — `fabric-skills`, `powerbi-authoring`. Skills and agents for Microsoft Fabric (Lakehouse, Warehouse, Power BI, Eventhouse, Eventstream, Dataflows, Spark).
 
 - **[Microsoft C++ Language Server](https://github.com/microsoft/cpp-language-server)** — Navigate and interact with your C++ code.