core: improve MCP reliability and add status monitoring

- Added 5-second timeout to MCP client verification to prevent hanging connections
- New GET /mcp endpoint to monitor server connection status
- Automatically removes unresponsive MCP clients during initialization

packages/opencode/src/server/server.ts

@@ -31,6 +31,7 @@ import { SessionRevert } from "../session/revert"
 import { lazy } from "../util/lazy"
 import { Todo } from "../session/todo"
 import { InstanceBootstrap } from "../project/bootstrap"
+import { MCP } from "../mcp"
 
 const ERRORS = {
   400: {
@@ -1183,6 +1184,26 @@ export namespace Server {
           return c.json(modes)
         },
       )
+      .get(
+        "/mcp",
+        describeRoute({
+          description: "Get MCP server status",
+          operationId: "mcp.status",
+          responses: {
+            200: {
+              description: "MCP server status",
+              content: {
+                "application/json": {
+                  schema: resolver(z.any()),
+                },
+              },
+            },
+          },
+        }),
+        async (c) => {
+          return c.json(await MCP.status())
+        },
+      )
       .post(
         "/tui/append-prompt",
         describeRoute({