Create the Writer plugin

.agents/plugins/marketplace.json

@@ -27,6 +27,18 @@
         "authentication": "ON_INSTALL"
       },
       "category": "Creativity"
+    },
+    {
+      "name": "writer",
+      "source": {
+        "source": "local",
+        "path": "./plugins/writer"
+      },
+      "policy": {
+        "installation": "AVAILABLE",
+        "authentication": "ON_INSTALL"
+      },
+      "category": "Productivity"
     }
   ]
 }

plugins/writer/.codex-plugin/plugin.json

@@ -0,0 +1,33 @@
+{
+  "name": "writer",
+  "version": "1.0.0",
+  "description": "Writing you can send as-is. Emails, social posts, newsletters, product descriptions, bios, job posts, proposals, and web copy — written to the real length limits of wherever they're going, with no invented facts and no preamble.",
+  "author": {
+    "name": "B12",
+    "email": "support@b12.io",
+    "url": "https://www.b12.io"
+  },
+  "homepage": "https://www.b12.io",
+  "license": "Apache-2.0",
+  "keywords": ["writing", "copywriting", "email", "social", "content", "b12"],
+  "skills": "./skills/",
+  "interface": {
+    "displayName": "Writer",
+    "shortDescription": "Writing that's ready to send",
+    "longDescription": "Say what you need written and who it's for. You get the piece itself, not a draft or a pile of options to choose between. It writes to the constraints that actually apply: a subject line that doesn't get cut off on a phone, a LinkedIn post that lands before the \"see more\" cut, a product description at the length a storefront expects. If a fact is missing it asks or marks a placeholder, so numbers, names, and dates are never quietly made up. Paste in a sample and it matches your voice. It can also generate a B12 site for the writing to live on.",
+    "developerName": "B12",
+    "category": "Productivity",
+    "capabilities": ["Read"],
+    "websiteURL": "https://www.b12.io",
+    "privacyPolicyURL": "https://www.b12.io/privacy-policy/",
+    "termsOfServiceURL": "https://www.b12.io/terms-of-service/",
+    "brandColor": "#4B22E8",
+    "logo": "./assets/icon.svg",
+    "composerIcon": "./assets/icon.svg",
+    "defaultPrompt": [
+      "Draft a LinkedIn post for my business",
+      "Write the about page for my website",
+      "Write a follow-up email to a client"
+    ]
+  }
+}