Add sanity-plugin to marketplace

.claude-plugin/marketplace.json

@@ -686,15 +686,18 @@
       "homepage": "https://github.com/semgrep/mcp-marketplace.git"
     },
     {
-      "name": "planetscale",
-      "description": "An authenticated hosted MCP server that accesses your PlanetScale organizations, databases, branches, schema, and Insights data. Query against your data, surface slow queries, and get organizational and account information.",
-      "category": "database",
+      "name": "sanity-plugin",
+      "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/planetscale/claude-plugin.git",
-        "sha": "f1066cac5bb956bbbb05918f5b07fe0e873d44ea"
+        "url": "https://github.com/sanity-io/agent-toolkit.git",
+        "sha": "4b1fb10bd707a22cf0cdfad5374ffc885f2ffa8d"
       },
-      "homepage": "https://planetscale.com/"
+      "homepage": "https://www.sanity.io"
     }
   ]
 }