Add sanity-plugin to marketplace

.claude-plugin/marketplace.json

@@ -686,15 +686,18 @@
       "homepage": "https://github.com/semgrep/mcp-marketplace.git"
     },
     {
-      "name": "mintlify",
+      "name": "sanity-plugin",
-      "description": "Build beautiful documentation sites with Mintlify. Convert non-markdown files into properly formatted MDX pages, add and modify content with correct component use, and automate documentation updates.",
+      "description": "Sanity content platform integration with MCP server, agent skills, and slash commands. Query and author content, build and optimize GROQ queries, design schemas, and set up Visual Editing.",
       "category": "development",
+      "author": {
+        "name": "Sanity"
+      },
       "source": {
         "source": "url",
-        "url": "https://github.com/mintlify/mintlify-claude-plugin.git",
+        "url": "https://github.com/sanity-io/agent-toolkit.git",
-        "sha": "ce435be18a700dc849d6a63a80da4816d1e2128c"
+        "sha": "4b1fb10bd707a22cf0cdfad5374ffc885f2ffa8d"
       },
-      "homepage": "https://www.mintlify.com/"
+      "homepage": "https://www.sanity.io"
     }
   ]
 }