diff --git a/extensions/acpx/openclaw.plugin.json b/extensions/acpx/openclaw.plugin.json
index 416eeb84d83..2addb54516c 100644
--- a/extensions/acpx/openclaw.plugin.json
+++ b/extensions/acpx/openclaw.plugin.json
@@ -98,11 +98,6 @@
       "label": "State Directory",
       "help": "Directory used for embedded ACP session state and persistence."
     },
-    "probeAgent": {
-      "label": "Health Probe Agent",
-      "help": "Agent id used for the embedded ACP runtime health probe. Defaults to Codex when unset.",
-      "advanced": true
-    },
     "permissionMode": {
       "label": "Permission Mode",
       "help": "Default permission policy for embedded ACP runtime prompts."
@@ -137,7 +132,7 @@
       "advanced": true
     },
     "probeAgent": {
-      "label": "Probe Agent",
+      "label": "Health Probe Agent",
       "help": "Agent id used for the embedded ACP runtime health probe. Defaults to the runtime built-in probe agent (codex). Set this to another configured ACP agent id (for example `opencode` or `claude`) when the default probe agent is not installed or not authenticated, so the whole embedded ACP backend does not get marked unavailable.",
       "advanced": true
     },
diff --git a/extensions/acpx/src/config.test.ts b/extensions/acpx/src/config.test.ts
index 68aa4a156ab..fec4b6934b3 100644
--- a/extensions/acpx/src/config.test.ts
+++ b/extensions/acpx/src/config.test.ts
@@ -67,10 +67,10 @@ describe("embedded acpx plugin config", () => {
     expect(resolved.probeAgent).toBeUndefined();
   });
 
-  it("carries an explicit probeAgent through to the resolved plugin config, trimmed", () => {
+  it("carries an explicit probeAgent through to the resolved plugin config, trimmed and lowercased", () => {
     const resolved = resolveAcpxPluginConfig({
       rawConfig: {
-        probeAgent: "  opencode  ",
+        probeAgent: "  OpenCode  ",
       },
       workspaceDir: "/tmp/openclaw-acpx",
     });