fix tests

middleware/openai_test.go

@@ -484,13 +484,7 @@ func TestChatMiddleware(t *testing.T) {
 						Function: api.ToolFunction{
 							Name:        "get_weather",
 							Description: "Get the current weather",
-							Parameters: struct {
-								Type       string                      `json:"type"`
-								Defs       any                         `json:"$defs,omitempty"`
-								Items      any                         `json:"items,omitempty"`
-								Required   []string                    `json:"required"`
-								Properties map[string]api.ToolProperty `json:"properties"`
-							}{
+							Parameters: api.ToolFunctionParameters{
 								Type:     "object",
 								Required: []string{"location"},
 								Properties: map[string]api.ToolProperty{