diff --git a/src/telemetry/toolMetricsUtils.ts b/src/telemetry/toolMetricsUtils.ts
index 124913a68..62cf1f3aa 100644
--- a/src/telemetry/toolMetricsUtils.ts
+++ b/src/telemetry/toolMetricsUtils.ts
@@ -52,8 +52,14 @@ export function generateToolMetrics(tools: ToolDefinition[]): ToolMetric[] {
       const transformedName = transformArgName(zodType, name);
       let argType = transformArgType(zodType);
 
-      if (zodType === 'ZodEnum' && schema._def.values?.length > 0) {
-        argType = validateEnumHomogeneity(schema._def.values);
+      if (argType === 'enum') {
+        let values;
+        if (schema._def.values?.length > 0) {
+          values = schema._def.values;
+        } else {
+          values = schema._def.innerType._def.values;
+        }
+        argType = validateEnumHomogeneity(values);
       }
 
       args.push({
diff --git a/src/telemetry/tool_call_metrics.json b/src/telemetry/tool_call_metrics.json
index b5437fb9d..496045ff6 100644
--- a/src/telemetry/tool_call_metrics.json
+++ b/src/telemetry/tool_call_metrics.json
@@ -64,7 +64,7 @@
     "args": [
       {
         "name": "networkConditions",
-        "argType": "enum"
+        "argType": "string"
       },
       {
         "name": "cpuThrottlingRate",
@@ -80,7 +80,7 @@
       },
       {
         "name": "colorScheme",
-        "argType": "enum"
+        "argType": "string"
       },
       {
         "name": "viewport_length",
@@ -211,11 +211,11 @@
     "args": [
       {
         "name": "mode",
-        "argType": "enum"
+        "argType": "string"
       },
       {
         "name": "device",
-        "argType": "enum"
+        "argType": "string"
       },
       {
         "name": "outputDirPath_length",
@@ -291,7 +291,7 @@
     "args": [
       {
         "name": "type",
-        "argType": "enum"
+        "argType": "string"
       },
       {
         "name": "url_length",
@@ -303,7 +303,7 @@
       },
       {
         "name": "handleBeforeUnload",
-        "argType": "enum"
+        "argType": "string"
       },
       {
         "name": "initScript_length",
@@ -454,7 +454,7 @@
     "args": [
       {
         "name": "format",
-        "argType": "enum"
+        "argType": "string"
       },
       {
         "name": "quality",