ollama use agent and tools error

[pdxrlj]

func main() {
	llm, err := ollama.New(
		ollama.WithModel("qwen2.5:14b"),
		ollama.WithFormat("json"),
		ollama.WithHTTPClient(httpClient),
	)
	if err != nil {
		panic(err)
	}

	content := []llms.MessageContent{
		llms.TextParts(llms.ChatMessageTypeHuman, "What is the weather like in Chicago?"),
	}
	generateContent, err := llm.GenerateContent(context.Background(), content, llms.WithTools(llmTools))
	if err != nil {
		panic(err)
	}
	println(generateContent.Choices[0].Content)

	AgentsTest(llm)
}

func AgentsTest(llm llms.Model) {
	agent := agents.NewOneShotAgent(llm, agentTools, agents.WithMaxIterations(1))
	executor := agents.NewExecutor(agent)
	input := "这段话的中文意思是什么：hello world"
	answer, err := chains.Run(context.Background(), executor, input)
	if err != nil {
		panic(err)
	}
	fmt.Println(answer)
}

var agentTools = []tools.Tool{
	&TranslateTools{},
}

var llmTools = []llms.Tool{
	{
		Type: "function",
		Function: &llms.FunctionDefinition{
			Name:        "getCurrentWeather",
			Description: "Get the current weather in a given location",
			Parameters: map[string]any{
				"type": "object",
				"properties": map[string]any{
					"location": map[string]any{
						"type":        "string",
						"description": "The city and state, e.g. San Francisco, CA",
					},
				},
				"required": []string{"location"},
			},
		},
	},
}

var _ tools.Tool = (*TranslateTools)(nil)

type TranslateTools struct {
}

func (t TranslateTools) Name() string {
	return "translation_content"
}

func (t TranslateTools) Description() string {
	return "翻译用户输入的content从source_language到target_language"
}

func (t TranslateTools) Call(ctx context.Context, input string) (string, error) {
	fmt.Println("input:", input)
	return input, nil
}

response error

{

panic: unable to parse agent output:

goroutine 1 [running]:
main.AgentsTest({0xee41a8?, 0xc0000fec00?})
        D:/code/golang/langchaingo_demo/main.go:60 +0x11f
main.main()
        D:/code/golang/langchaingo_demo/main.go:51 +0x3a5
exit status 2

[pdxrlj]

Can anyone tell me why?