diff --git a/packages/ai/src/tools/visualization-tools/create-metrics-file-tool.ts b/packages/ai/src/tools/visualization-tools/create-metrics-file-tool.ts
index e7dbf2c5c..d9d04b67e 100644
--- a/packages/ai/src/tools/visualization-tools/create-metrics-file-tool.ts
+++ b/packages/ai/src/tools/visualization-tools/create-metrics-file-tool.ts
@@ -153,7 +153,7 @@ function createDataMetadata(results: Record<string, unknown>[]): DataMetadata {
     const uniqueValues = new Set(values).size;
 
     columnMetadata.push({
-      name: columnName,
+      name: columnName.toLowerCase(),
       min_value: minValue,
       max_value: maxValue,
       unique_values: uniqueValues,
diff --git a/packages/ai/src/tools/visualization-tools/modify-metrics-file-tool.ts b/packages/ai/src/tools/visualization-tools/modify-metrics-file-tool.ts
index 61514e918..c327ada7e 100644
--- a/packages/ai/src/tools/visualization-tools/modify-metrics-file-tool.ts
+++ b/packages/ai/src/tools/visualization-tools/modify-metrics-file-tool.ts
@@ -145,7 +145,7 @@ function createDataMetadata(results: Record<string, unknown>[]): DataMetadata {
     const uniqueValues = new Set(values).size;
 
     columnMetadata.push({
-      name: columnName,
+      name: columnName.toLowerCase(),
       min_value: minValue,
       max_value: maxValue,
       unique_values: uniqueValues,