diff --git a/tools/metadata.go b/tools/metadata.go
index 46eb221..a70bd39 100644
--- a/tools/metadata.go
+++ b/tools/metadata.go
@@ -36,18 +36,18 @@
 }
 
 // InputSchema returns the JSON schema for tool parameters
-func (m *MetadataTool) InputSchema() map[string]interface{} {
-	return map[string]interface{}{
+func (m *MetadataTool) InputSchema() map[string]any {
+	return map[string]any{
 		"type": "object",
-		"properties": map[string]interface{}{
-			"action": map[string]interface{}{
+		"properties": map[string]any{
+			"action": map[string]any{
 				"type":        "string",
 				"description": "Type of metadata operation to perform. 'list' retrieves all available corpora with their basic information, 'statistics' provides detailed corpus statistics.",
 				"enum":        []string{"list", "statistics"},
 				"default":     "list",
 				"examples":    []string{"list", "statistics"},
 			},
-			"corpus": map[string]interface{}{
+			"corpus": map[string]any{
 				"type":        "string",
 				"description": "Virtual corpus query to filter results based on metadata fields. For 'list' action, this parameter is ignored. For 'statistics' action, specifies which subset of data to analyze using metadata queries with boolean operations (& | !), comparison operators (= != < > in), and regular expressions (/pattern/). When not provided with 'statistics', returns statistics for all accessible data.",
 				"pattern":     "^[a-zA-Z0-9._\\-\\s&|!=<>()/*\"']+$",