Revert "Omit args and params in tool function def and calls (#13516)" (#13518)

This reverts commit 0fadeffa.

api/types.go

@@ -341,7 +341,7 @@ type ToolFunctionParameters struct {
 	Defs       any                     `json:"$defs,omitempty"`
 	Items      any                     `json:"items,omitempty"`
 	Required   []string                `json:"required,omitempty"`
-	Properties map[string]ToolProperty `json:"properties,omitempty"`
+	Properties map[string]ToolProperty `json:"properties"`
 }
 
 func (t *ToolFunctionParameters) String() string {
@@ -352,7 +352,7 @@ func (t *ToolFunctionParameters) String() string {
 type ToolFunction struct {
 	Name        string                 `json:"name"`
 	Description string                 `json:"description,omitempty"`
-	Parameters  ToolFunctionParameters `json:"parameters,omitempty"`
+	Parameters  ToolFunctionParameters `json:"parameters"`
 }
 
 func (t *ToolFunction) String() string {

server/routes_debug_test.go

@@ -363,7 +363,7 @@ func TestChatDebugRenderOnly(t *testing.T) {
 				DebugRenderOnly: true,
 			},
 			expectDebug:    true,
-			expectTemplate: "[{\"type\":\"function\",\"function\":{\"name\":\"get_weather\",\"description\":\"Get weather information\",\"parameters\":{\"type\":\"\"}}}]user: Get the weather\n",
+			expectTemplate: "[{\"type\":\"function\",\"function\":{\"name\":\"get_weather\",\"description\":\"Get weather information\",\"parameters\":{\"type\":\"\",\"properties\":null}}}]user: Get the weather\n",
 		},
 	}