Agent card: describe Surface honestly as MCP + HTTP tool

.well-known/agent-card.json

@@ -1,9 +1,9 @@
 {
   "protocolVersion": "0.3.0",
   "name": "Surface",
-  "description": "Surface is the link-safety layer between an AI agent and the open web. Preflight a URL before opening it: unwraps short links, follows redirects, returns next=fetch or next=skip. MCP at https://nova-otter-delta-cloud.grok.me/mcp; HTTP POST https://nova-otter-delta-cloud.grok.me/v1/preflight. Free up to 1M requests/month. Contact: canada.site.ops@gmail.com",
-  "url": "https://nova-otter-delta-cloud.grok.me/mcp",
-  "preferredTransport": "JSONRPC",
+  "description": "Surface is a link-safety TOOL for AI agents (MCP server + HTTP API), not a conversational A2A agent. It does not implement A2A JSON-RPC message/send. Use it via MCP (streamable HTTP) at https://nova-otter-delta-cloud.grok.me/mcp, or HTTP POST https://nova-otter-delta-cloud.grok.me/v1/preflight with {\"url\": ...}: unwraps short links, follows redirects, returns next=fetch or next=skip. Free up to 1M requests/month. Contact: canada.site.ops@gmail.com",
+  "url": "https://nova-otter-delta-cloud.grok.me/v1/preflight",
+  "preferredTransport": "HTTP+JSON",
   "provider": {
     "organization": "Surface (Canada Site Ops)",
     "url": "https://otter-sand-wolf-spring.grok.me"
@@ -12,7 +12,20 @@
   "documentationUrl": "https://nova-otter-delta-cloud.grok.me/docs",
   "capabilities": {
     "streaming": false,
-    "pushNotifications": false
+    "pushNotifications": false,
+    "extensions": [
+      {
+        "uri": "https://modelcontextprotocol.io",
+        "description": "Native interface is MCP (streamable HTTP), not A2A",
+        "required": false,
+        "params": {
+          "mcp_url": "https://nova-otter-delta-cloud.grok.me/mcp",
+          "http_preflight": "POST https://nova-otter-delta-cloud.grok.me/v1/preflight",
+          "openapi": "https://nova-otter-delta-cloud.grok.me/openapi.json",
+          "llms_txt": "https://nova-otter-delta-cloud.grok.me/llms.txt"
+        }
+      }
+    ]
   },
   "securitySchemes": {
     "bearer": {
@@ -52,11 +65,5 @@
         "user-agent"
       ]
     }
-  ],
-  "additionalInterfaces": [
-    {
-      "url": "https://nova-otter-delta-cloud.grok.me/mcp",
-      "transport": "JSONRPC"
-    }
   ]
 }