diff --git a/cmd/diagnose/diagnose.go b/cmd/diagnose/diagnose.go
index 6366bfb..18de355 100644
--- a/cmd/diagnose/diagnose.go
+++ b/cmd/diagnose/diagnose.go
@@ -1,55 +1,22 @@
 package diagnose
 
 import (
-	"bytes"
-	"fmt"
-
 	"github.com/spf13/cobra"
-	"k8s.io/client-go/kubernetes/scheme"
-	"sigs.k8s.io/yaml"
 
 	"github.com/knight42/kopilot/cmd"
 )
 
 func New(commonOpts cmd.Options) *cobra.Command {
+	opts := Options{
+		common: commonOpts,
+	}
 	c := &cobra.Command{
 		Use:          "diagnose TYPE NAME",
 		Short:        "Diagnose a resource",
 		SilenceUsage: true,
 		Args:         cobra.ExactArgs(2),
-		RunE: func(cmd *cobra.Command, args []string) error {
-			ns, _, _ := commonOpts.ToRawKubeConfigLoader().Namespace()
-			obj, err := commonOpts.NewBuilder().
-				NamespaceParam(ns).
-				DefaultNamespace().
-				WithScheme(scheme.Scheme, scheme.Scheme.PrioritizedVersionsAllGroups()...).
-				ResourceNames(args[0], args[1]).
-				Do().
-				Object()
-			if err != nil {
-				return fmt.Errorf("get object: %w", err)
-			}
-
-			pruneObject(obj)
-
-			// TODO: include logs or events
-			data, err := yaml.Marshal(obj)
-			if err != nil {
-				return fmt.Errorf("marshal object: %w", err)
-			}
-
-			var buf bytes.Buffer
-			_ = promptDiagnose.Execute(&buf, templateData{
-				Data: string(data),
-				Lang: commonOpts.Lang,
-			})
-
-			// TODO: limit the length of the prompt?
-			return commonOpts.NewChatGPTClient(" Diagnosing...").
-				CreateCompletion(cmd.Context(), buf.String(), cmd.OutOrStdout())
-		},
+		RunE:         opts.Run,
 	}
-	flags := c.Flags()
-	commonOpts.AddFlags(flags)
+	opts.AddFlags(c.Flags())
 	return c
 }
diff --git a/cmd/diagnose/options.go b/cmd/diagnose/options.go
new file mode 100644
index 0000000..b0e5932
--- /dev/null
+++ b/cmd/diagnose/options.go
@@ -0,0 +1,74 @@
+package diagnose
+
+import (
+	"bytes"
+	"fmt"
+
+	"github.com/spf13/cobra"
+	"github.com/spf13/pflag"
+	corev1 "k8s.io/api/core/v1"
+	"k8s.io/apimachinery/pkg/api/meta"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/client-go/kubernetes/scheme"
+	"sigs.k8s.io/yaml"
+
+	"github.com/knight42/kopilot/cmd"
+)
+
+type Options struct {
+	common cmd.Options
+
+	FullObject bool
+}
+
+func (o *Options) AddFlags(flags *pflag.FlagSet) {
+	o.common.AddFlags(flags)
+
+	flags.BoolVar(&o.FullObject, "full-object", false, "Include the full object in prompt. Note that the GPT 3.5 modal can only handle 4097 tokens, including the full object might exceed the limit.")
+}
+
+func (o *Options) Run(cmd *cobra.Command, args []string) error {
+	ns, _, _ := o.common.ToRawKubeConfigLoader().Namespace()
+	obj, err := o.common.NewBuilder().
+		NamespaceParam(ns).
+		DefaultNamespace().
+		WithScheme(scheme.Scheme, scheme.Scheme.PrioritizedVersionsAllGroups()...).
+		ResourceNames(args[0], args[1]).
+		Do().
+		Object()
+	if err != nil {
+		return fmt.Errorf("get object: %w", err)
+	}
+
+	data := o.marshalObject(obj)
+	var buf bytes.Buffer
+	_ = promptDiagnose.Execute(&buf, templateData{
+		// TODO: include logs or events
+		Data: data,
+		Lang: o.common.Lang,
+	})
+
+	return o.common.NewChatGPTClient(" Diagnosing...").
+		CreateCompletion(cmd.Context(), buf.String(), cmd.OutOrStdout())
+}
+
+func (o *Options) marshalObject(obj runtime.Object) string {
+	if a, err := meta.Accessor(obj); err == nil {
+		a.SetManagedFields(nil)
+		a.SetAnnotations(nil)
+		a.SetLabels(nil)
+	}
+
+	switch actual := obj.(type) {
+	case *corev1.Pod:
+		if !o.FullObject {
+			// Usually we only need to know the pod's status.
+			actual.Spec = corev1.PodSpec{}
+		}
+	case *corev1.Node:
+		actual.Status.Images = nil
+	}
+
+	data, _ := yaml.Marshal(obj)
+	return string(data)
+}
diff --git a/cmd/diagnose/prune.go b/cmd/diagnose/prune.go
deleted file mode 100644
index ad29ce7..0000000
--- a/cmd/diagnose/prune.go
+++ /dev/null
@@ -1,24 +0,0 @@
-package diagnose
-
-import (
-	corev1 "k8s.io/api/core/v1"
-	"k8s.io/apimachinery/pkg/api/meta"
-	"k8s.io/apimachinery/pkg/runtime"
-)
-
-func pruneObject(obj runtime.Object) {
-	if a, err := meta.Accessor(obj); err == nil {
-		a.SetManagedFields(nil)
-		a.SetAnnotations(nil)
-		a.SetLabels(nil)
-	}
-
-	switch actual := obj.(type) {
-	case *corev1.Node:
-		pruneNode(actual)
-	}
-}
-
-func pruneNode(obj *corev1.Node) {
-	obj.Status.Images = nil
-}