diff --git a/apps/api/src/api/tool_instances.py b/apps/api/src/api/tool_instances.py
index 21845e1..1bf61e8 100644
--- a/apps/api/src/api/tool_instances.py
+++ b/apps/api/src/api/tool_instances.py
@@ -1206,7 +1206,7 @@ async def check_instance_tunnel_health(
         response["probe_status"] = "pending"
     elif instance.probe_result:
         response["probe_status"] = "success" if instance.probe_result.get("success") else "failed"
-        response["last_probe_output"] = "\n".join(instance.probe_result.get("logs", []))[:500]
+        response["last_probe_output"] = "\n".join(instance.probe_result.get("logs", []))
 
     # Check tunnel health if instance has a URL and is web-enabled
     if instance.url and instance.status in ("running", "unhealthy"):
diff --git a/apps/web/src/pages/sessions.tsx b/apps/web/src/pages/sessions.tsx
index bf74bad..0d7b9c2 100644
--- a/apps/web/src/pages/sessions.tsx
+++ b/apps/web/src/pages/sessions.tsx
@@ -407,17 +407,18 @@ export const SessionsPage = () => {
                       {tunnelHealth[session.id] && tunnelHealth[session.id].tunnel_status === "error_response" && (
                         <span className="status-badge warning">app error ({tunnelHealth[session.id].tunnel_status_code})</span>
                       )}
-                      {tunnelHealth[session.id]?.last_probe_output && (
+                      {tunnelHealth[session.id]?.probe_status && tunnelHealth[session.id]?.probe_status !== "not_applicable" && (
                         <div className="probe-output-section">
                           <button
-                            className="probe-toggle"
+                            className={`probe-toggle probe-${tunnelHealth[session.id].probe_status}`}
                             onClick={() => setExpandedProbeId(expandedProbeId === session.id ? null : session.id)}
                             type="button"
                           >
                             <Icon name="info" size="sm" />
-                            {expandedProbeId === session.id ? "Hide probe output" : "Show probe output"}
+                            Probe: {tunnelHealth[session.id].probe_status}
+                            {expandedProbeId === session.id ? " (hide)" : " (show)"}
                           </button>
-                          {expandedProbeId === session.id && (
+                          {expandedProbeId === session.id && tunnelHealth[session.id]?.last_probe_output && (
                             <pre className="probe-output">
                               {tunnelHealth[session.id].last_probe_output}
                             </pre>