diff --git a/anthropic.go b/anthropic.go
index 4d579cf..784cc32 100644
--- a/anthropic.go
+++ b/anthropic.go
@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"io"
 	"log"
+	"log/slog"
 	"net/http"
 
 	anth "github.com/liushuangls/go-anthropic/v2"
@@ -25,6 +26,13 @@ func (a anthropic) ModelVersion(modelVersion string) (ChatCompletion, error) {
 	return a, nil
 }
 
+func deferClose(c io.Closer) {
+	err := c.Close()
+	if err != nil {
+		slog.Error("error closing", "error", err)
+	}
+}
+
 func (a anthropic) requestToAnthropicRequest(req Request) anth.MessagesRequest {
 	res := anth.MessagesRequest{
 		Model:     anth.Model(a.model),
@@ -85,7 +93,7 @@ func (a anthropic) requestToAnthropicRequest(req Request) anth.MessagesRequest {
 						continue
 					}
 
-					defer resp.Body.Close()
+					defer deferClose(resp.Body)
 
 					img.ContentType = resp.Header.Get("Content-Type")
 
@@ -121,12 +129,14 @@ func (a anthropic) requestToAnthropicRequest(req Request) anth.MessagesRequest {
 		}
 	}
 
-	for _, tool := range req.Toolbox.funcs {
-		res.Tools = append(res.Tools, anth.ToolDefinition{
-			Name:        tool.Name,
-			Description: tool.Description,
-			InputSchema: tool.Parameters,
-		})
+	if req.Toolbox != nil {
+		for _, tool := range req.Toolbox.funcs {
+			res.Tools = append(res.Tools, anth.ToolDefinition{
+				Name:        tool.Name,
+				Description: tool.Description,
+				InputSchema: tool.Parameters,
+			})
+		}
 	}
 
 	res.Messages = msgs