(Draft) Add Codex plugin

.agents/plugins/marketplace.json

@@ -0,0 +1,20 @@
+{
+  "name": "dart-flutter",
+  "interface": {
+    "displayName": "Dart and Flutter"
+  },
+  "plugins": [
+    {
+      "name": "dart-flutter",
+      "source": {
+        "source": "local",
+        "path": "./"
+      },
+      "policy": {
+        "installation": "AVAILABLE",
+        "authentication": "ON_INSTALL"
+      },
+      "category": "Developer Tools"
+    }
+  ]
+}

plugins/.codex-plugin/plugin.json

@@ -0,0 +1,38 @@
+{
+  "name": "dart-flutter",
+  "version": "1.0.0",
+  "description": "Official Codex plugin for Dart and Flutter that installs Flutter/Dart Skills and Dart MCP server for building natively compiled, visually stunning applications for mobile, web, desktop, and embedded devices from a single codebase",
+  "author": {
+    "name": "Dart and Flutter",
+    "url": "https://flutter.dev"
+  },
+  "homepage": "https://github.com/dart-lang/ai/tree/main/plugins",
+  "repository": "https://github.com/dart-lang/ai",
+  "license": "BSD-3-Clause",
+  "keywords": [
+    "flutter",
+    "dart",
+    "mobile",
+    "codex",
+    "skills",
+    "mcp"
+  ],
+  "skills": "./skills/",
+  "mcpServers": "./.mcp.json",
+  "interface": {
+    "displayName": "Dart and Flutter",
+    "shortDescription": "Build and manage Dart and Flutter apps from Codex.",
+    "longDescription": "Use official Dart and Flutter skills and the MCP server to develop apps, run workflows, and manage code from Codex.",
+    "developerName": "Dart and Flutter",
+    "category": "Developer Tools",
+    "capabilities": [
+      "Skills",
+      "MCP"
+    ],
+    "websiteURL": "https://flutter.dev",
+    "defaultPrompt": [
+      "Set up Flutter in this app.",
+      "Create a new Dart skill."
+    ]
+  }
+}

plugins/README.md

@@ -25,3 +25,16 @@ Verify the installation:
 ```bash
 claude plugin marketplace list
 ```
+
+### Codex Plugin
+
+Add the Dart and Flutter marketplace for Codex plugins:
+
+```bash
+codex plugin marketplace add dart-lang/ai/plugins
+```
+
+Install the Dart and Flutter plugin:
+
+```bash
+codex plugin add dart-flutter@dart-flutter