Add sanity-plugin to marketplace

.claude-plugin/marketplace.json

@@ -686,15 +686,18 @@
       "homepage": "https://github.com/semgrep/mcp-marketplace.git"
     },
     {
-      "name": "sourcegraph",
+      "name": "sanity-plugin",
-      "description": "Code search and understanding across codebases. Search, read, and trace references across repositories; analyze refactor impact; investigate incidents via commit and diff search; run targeted security sweeps.",
+      "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/sourcegraph-community/sourcegraph-claudecode-plugin.git",
+        "url": "https://github.com/sanity-io/agent-toolkit.git",
-        "sha": "cfe3d44476957b16d1575261bef6b2dc7cb1e0b7"
+        "sha": "4b1fb10bd707a22cf0cdfad5374ffc885f2ffa8d"
       },
-      "homepage": "https://sourcegraph.com"
+      "homepage": "https://www.sanity.io"
     }
   ]
 }