diff --git a/assistant/assistant.go b/assistant/assistant.go
index 6b4764b9..fb3b9dce 100644
--- a/assistant/assistant.go
+++ b/assistant/assistant.go
@@ -2,6 +2,7 @@ package assistant
 
 import (
 	"context"
+	"fmt"
 	"strings"
 
 	obs "github.com/henomis/lingoose/observer"
@@ -94,11 +95,21 @@ func (a *Assistant) Run(ctx context.Context) error {
 	}
 
 	for i := 0; i < int(a.maxIterations); i++ {
+		ctx, spanIteration, err := a.startObserveSpan(ctx, fmt.Sprintf("iteration-%d", i+1))
+		if err != nil {
+			return err
+		}
+
 		err = a.llm.Generate(ctx, a.thread)
 		if err != nil {
 			return err
 		}
 
+		err = a.stopObserveSpan(ctx, spanIteration)
+		if err != nil {
+			return err
+		}
+
 		if a.thread.LastMessage().Role != thread.RoleTool {
 			break
 		}
diff --git a/assistant/prompt.go b/assistant/prompt.go
index 29f04df8..c6f14b08 100644
--- a/assistant/prompt.go
+++ b/assistant/prompt.go
@@ -4,7 +4,7 @@ const (
 	//nolint:lll
 	baseRAGPrompt = "Use the following pieces of retrieved context to answer the question.\n\nQuestion: {{.question}}\nContext:\n{{range .results}}{{.}}\n\n{{end}}"
 	//nolint:lll
-	systemPrompt = "You name is {{.assistantName}}, and you are {{.assistantIdentity}} {{if ne .companyName \"\" }}at {{.companyName}}{{end}}{{if ne .companyDescription \"\" }}, {{.companyDescription}}{{end}}. Your task is to assist humans {{.assistantScope}}."
+	systemPrompt = "{{if ne .assistantName \"\"}}You name is {{.assistantName}}, {{end}}{{if ne .assistantIdentity \"\"}}you are {{.assistantIdentity}}.{{end}} {{if ne .companyName \"\" }}at {{.companyName}}{{end}}{{if ne .companyDescription \"\" }}, {{.companyDescription}}.{{end}} Your task is to assist humans {{.assistantScope}}."
 
 	defaultAssistantName      = "AI assistant"
 	defaultAssistantIdentity  = "a helpful and polite assistant"
diff --git a/examples/assistant/agent/main.go b/examples/assistant/agent/main.go
index dac59c26..5c0e723b 100644
--- a/examples/assistant/agent/main.go
+++ b/examples/assistant/agent/main.go
@@ -17,45 +17,41 @@ import (
 func main() {
 	ctx := context.Background()
 
-	o := langfuse.New(ctx)
-	trace, err := o.Trace(&observer.Trace{Name: "state of the union"})
+	langfuseObserver := langfuse.New(ctx)
+	trace, err := langfuseObserver.Trace(&observer.Trace{Name: "Average Temperature calculator"})
 	if err != nil {
 		panic(err)
 	}
 
-	ctx = observer.ContextWithObserverInstance(ctx, o)
+	ctx = observer.ContextWithObserverInstance(ctx, langfuseObserver)
 	ctx = observer.ContextWithTraceID(ctx, trace.ID)
 
 	auto := "auto"
-	a := assistant.New(
+	myAssistant := assistant.New(
 		openai.New().WithModel(openai.GPT4o).WithToolChoice(&auto).WithTools(
 			pythontool.New(),
 			serpapitool.New(),
 		),
 	).WithParameters(
 		assistant.Parameters{
-			AssistantName:      "AI Assistant",
-			AssistantIdentity:  "an helpful assistant",
-			AssistantScope:     "with their questions.",
-			CompanyName:        "",
-			CompanyDescription: "",
+			AssistantName:     "AI Assistant",
+			AssistantIdentity: "a helpful assistant",
+			AssistantScope:    "answering questions",
 		},
 	).WithThread(
 		thread.New().AddMessages(
 			thread.NewUserMessage().AddContent(
-				thread.NewTextContent("calculate the average temperature in celsius degrees of New York, Rome, and Tokyo."),
+				thread.NewTextContent("Search the current temperature of New York, Rome, and Tokyo, then calculate the average temperature in Celsius."),
 			),
 		),
 	).WithMaxIterations(10)
 
-	err = a.Run(ctx)
+	err = myAssistant.Run(ctx)
 	if err != nil {
 		panic(err)
 	}
 
-	fmt.Println("----")
-	fmt.Println(a.Thread())
-	fmt.Println("----")
+	fmt.Println(myAssistant.Thread())
 
-	o.Flush(ctx)
+	langfuseObserver.Flush(ctx)
 }
diff --git a/tool/python/python.go b/tool/python/python.go
index 2ac686f2..ff677735 100644
--- a/tool/python/python.go
+++ b/tool/python/python.go
@@ -37,7 +37,7 @@ func (t *Tool) Name() string {
 }
 
 func (t *Tool) Description() string {
-	return "A tool that runs Python code using the Python interpreter. The code should print the final result to stdout."
+	return "A tool that runs Python code using the Python interpreter. Use this tool to solve calculations, manipulate data, or perform any other Python-related tasks. The code should print the final result to stdout."
 }
 
 func (t *Tool) Fn() any {
@@ -63,6 +63,12 @@ func (t *Tool) fn(i Input) Output {
 		}
 	}
 
+	if out.String() == "" {
+		return Output{
+			Error: "no output from script, script must print the final result to stdout",
+		}
+	}
+
 	// Return the output as a string.
 	return Output{Result: out.String()}
 }