diff --git a/pkg/mcp/query_transactions_tool_handler.go b/pkg/mcp/query_transactions_tool_handler.go
index a31756de..41793652 100644
--- a/pkg/mcp/query_transactions_tool_handler.go
+++ b/pkg/mcp/query_transactions_tool_handler.go
@@ -19,7 +19,7 @@ type MCPQueryTransactionsRequest struct {
 	StartTime             string `json:"start_time" jsonschema:"format=date-time" jsonschema_description:"Start time for the query in RFC 3339 format (e.g. 2023-01-01T12:00:00Z)"`
 	EndTime               string `json:"end_time" jsonschema:"format=date-time" jsonschema_description:"End time for the query in RFC 3339 format or (e.g. 2023-01-01T12:00:00Z)"`
 	Type                  string `json:"type,omitempty" jsonschema:"enum=income,enum=expense,enum=transfer" jsonschema_description:"Transaction type to filter by (income, expense, transfer) (optional)"`
-	SecondaryCategoryName string `json:"category_name,omitempty" jsonschema_description:"Secondary category name to filter transactions by (optional)"`
+	SecondaryCategoryName string `json:"category_name,omitempty" jsonschema_description:"Primary or secondary category name to filter transactions by (optional)"`
 	AccountName           string `json:"account_name,omitempty" jsonschema_description:"Account name to filter transactions by (optional)"`
 	Keyword               string `json:"keyword,omitempty" jsonschema_description:"Keyword to search in transaction description (optional)"`
 	Count                 int32  `json:"count,omitempty" jsonschema:"default=100" jsonschema_description:"Maximum number of results to return (default: 100)"`