diff --git a/internal/runtime/workflow.go b/internal/runtime/workflow.go
index 155be1e..1a3bde3 100644
--- a/internal/runtime/workflow.go
+++ b/internal/runtime/workflow.go
@@ -177,7 +177,7 @@ func (w WorkflowRunner) run(rc RunCtx, launch workflow.Launch) (workflowOutcome,
 		if err != nil {
 			return outcome(def, statuses, arts, drops, err.Error()), err
 		}
-		output, stepArts, reason, err := w.runStepWithCritic(rc, def, rendered, vars, prev, &wholeLeft, &drops)
+		output, stepArts, reason, err := w.runStepWithCritic(rc, def, rendered, vars, prev, launch.Scripts, &wholeLeft, &drops)
 		arts = append(arts, stepArts...)
 		if err != nil {
 			statuses[i] = "failed"
@@ -198,7 +198,7 @@ func (w WorkflowRunner) run(rc RunCtx, launch workflow.Launch) (workflowOutcome,
 	return res, nil
 }
 
-func (w WorkflowRunner) runStepWithCritic(rc RunCtx, def core.WorkflowDef, step core.WorkflowStep, vars workflow.Vars, prev string, wholeLeft *int, drops *[]string) (string, []*core.ArtifactRef, string, error) {
+func (w WorkflowRunner) runStepWithCritic(rc RunCtx, def core.WorkflowDef, step core.WorkflowStep, vars workflow.Vars, prev string, scripts map[string]string, wholeLeft *int, drops *[]string) (string, []*core.ArtifactRef, string, error) {
 	stepRetries := 1
 	if step.Critic != nil && step.Critic.MaxRetries > 0 {
 		stepRetries = step.Critic.MaxRetries
@@ -216,7 +216,7 @@ func (w WorkflowRunner) runStepWithCritic(rc RunCtx, def core.WorkflowDef, step
 		} else if note != "" {
 			current.Prompt = "未通过验收：" + note
 		}
-		output, got, err := w.runWorkflowStep(rc, current, vars, prev)
+		output, got, err := w.runWorkflowStep(rc, current, vars, prev, scripts)
 		arts = append(arts, got...)
 		if err != nil {
 			return output, arts, err.Error(), err
@@ -242,7 +242,7 @@ func (w WorkflowRunner) runStepWithCritic(rc RunCtx, def core.WorkflowDef, step
 	}
 }
 
-func (w WorkflowRunner) runWorkflowStep(rc RunCtx, step core.WorkflowStep, vars workflow.Vars, prev string) (string, []*core.ArtifactRef, error) {
+func (w WorkflowRunner) runWorkflowStep(rc RunCtx, step core.WorkflowStep, vars workflow.Vars, prev string, scripts map[string]string) (string, []*core.ArtifactRef, error) {
 	switch step.Kind {
 	case "prompt":
 		return runPromptStep(rc, step)
@@ -302,7 +302,7 @@ func (w WorkflowRunner) runWorkflowStep(rc RunCtx, step core.WorkflowStep, vars
 		}
 		return string(created.ID), nil, nil
 	case "script":
-		return executeScriptStep(rc, w, step)
+		return executeScriptStep(rc, w, step, scripts)
 	default:
 		return "", nil, fmt.Errorf("workflow: 未知步骤类型 %s", step.Kind)
 	}
diff --git a/internal/runtime/workflow_script.go b/internal/runtime/workflow_script.go
index 78cc7b3..0e126fa 100644
--- a/internal/runtime/workflow_script.go
+++ b/internal/runtime/workflow_script.go
@@ -63,10 +63,14 @@ func scriptSandbox(rc RunCtx) (string, error) {
 	return sandbox, nil
 }
 
-func executeScriptStep(rc RunCtx, runner WorkflowRunner, step core.WorkflowStep) (string, []*core.ArtifactRef, error) {
-	body, err := scriptBody(rc, step.Script)
-	if err != nil {
-		return "", nil, err
+func executeScriptStep(rc RunCtx, runner WorkflowRunner, step core.WorkflowStep, scripts map[string]string) (string, []*core.ArtifactRef, error) {
+	body := scripts[step.Script]
+	if strings.TrimSpace(body) == "" {
+		var err error
+		body, err = scriptBody(rc, step.Script)
+		if err != nil {
+			return "", nil, err
+		}
 	}
 	sandbox, err := scriptSandbox(rc)
 	if err != nil {
diff --git a/internal/runtime/workflow_script_test.go b/internal/runtime/workflow_script_test.go
index d14a456..c26ac10 100644
--- a/internal/runtime/workflow_script_test.go
+++ b/internal/runtime/workflow_script_test.go
@@ -209,6 +209,19 @@ f.flush()
 	}
 }
 
+func TestRegisteredWorkflowUsesItsOwnScriptCopy(t *testing.T) {
+	f := &wfFake{sandbox: t.TempDir(), settings: scriptSettings()}
+	res, err := (WorkflowRunner{}).run(f, workflow.Launch{
+		Def: core.WorkflowDef{ID: "demo.script", Title: "脚本", Steps: []core.WorkflowStep{{
+			ID: "run", Title: "跑", Kind: "script", Script: "workflows/scripts/demo.py",
+		}}},
+		Scripts: map[string]string{"workflows/scripts/demo.py": "print('from-launch')\n"},
+	})
+	if err != nil || !strings.Contains(res.Summary, "完成") {
+		t.Fatalf("err %v summary %s", err, res.Summary)
+	}
+}
+
 func TestModelScriptNeedsSwitchAndConfirm(t *testing.T) {
 	f := &wfFake{sandbox: t.TempDir()}
 	out := (&directRun{rc: f}).runRegisteredWorkflow(`{"script":"print('pong')"}`)