diff --git a/frontend/src/components/procedural/StepDetail.tsx b/frontend/src/components/procedural/StepDetail.tsx
index 1e5616b5..1af4b6c2 100644
--- a/frontend/src/components/procedural/StepDetail.tsx
+++ b/frontend/src/components/procedural/StepDetail.tsx
@@ -1,6 +1,6 @@
 import { useState } from 'react'
 import { AlertTriangle, CheckCircle2, Info, Zap, Copy, Check, ExternalLink } from 'lucide-react'
-import type { ProceduralStep, StepContentType, CommandBlock } from '@/types'
+import type { RuntimeStep, StepContentType, CommandBlock } from '@/types'
 import { resolveVariables } from '@/lib/variableResolver'
 import { cn } from '@/lib/utils'
 
@@ -12,7 +12,7 @@ const contentTypeConfig: Record<StepContentType, { icon: typeof Zap; color: stri
 }
 
 interface StepDetailProps {
-  step: ProceduralStep
+  step: RuntimeStep
   stepNumber: number
   totalSteps: number
   variables: Record<string, string>
@@ -39,13 +39,18 @@ export function StepDetail({
   isLast,
 }: StepDetailProps) {
   const [copiedIndex, setCopiedIndex] = useState<number | null>(null)
+  const isCustom = 'isCustom' in step && step.isCustom
   const contentType = step.content_type || 'action'
   const config = contentTypeConfig[contentType]
   const Icon = config.icon
 
   // Derive verification from either flat fields or nested object
-  const verificationPrompt = step.verification_prompt || step.verification?.prompt
-  const verificationType = step.verification_type || step.verification?.type
+  const verificationPrompt = !isCustom && 'verification_prompt' in step
+    ? step.verification_prompt || step.verification?.prompt
+    : undefined
+  const verificationType = !isCustom && 'verification_type' in step
+    ? step.verification_type || step.verification?.type
+    : undefined
 
   const resolve = (text: string | undefined) => {
     if (!text) return ''
@@ -87,14 +92,20 @@ export function StepDetail({
         <div className="min-w-0 flex-1">
           <h2 className="text-lg font-semibold text-foreground">{step.title}</h2>
           <div className="mt-1 flex items-center gap-2">
-            <span className={cn('inline-flex items-center gap-1 rounded-full px-2 py-0.5 text-xs', config.bg, config.color)}>
-              <Icon className="h-3 w-3" />
-              {config.label}
-            </span>
+            {isCustom ? (
+              <span className="inline-flex items-center gap-1 rounded-full bg-amber-400/15 px-2 py-0.5 text-xs text-amber-400">
+                ✦ Custom Step
+              </span>
+            ) : (
+              <span className={cn('inline-flex items-center gap-1 rounded-full px-2 py-0.5 text-xs', config.bg, config.color)}>
+                <Icon className="h-3 w-3" />
+                {config.label}
+              </span>
+            )}
             <span className="text-xs text-muted-foreground">
               Step {stepNumber} of {totalSteps}
             </span>
-            {step.estimated_minutes && (
+            {'estimated_minutes' in step && step.estimated_minutes && (
               <span className="text-xs text-muted-foreground">~{step.estimated_minutes} min</span>
             )}
           </div>
@@ -102,7 +113,7 @@ export function StepDetail({
       </div>
 
       {/* Warning banner */}
-      {step.warning_text && (
+      {'warning_text' in step && step.warning_text && (
         <div className="flex items-start gap-2 rounded-lg border border-yellow-400/20 bg-yellow-400/5 px-3 py-2.5">
           <AlertTriangle className="mt-0.5 h-4 w-4 shrink-0 text-yellow-400" />
           <p className="text-sm text-yellow-200">{resolve(step.warning_text)}</p>
@@ -142,7 +153,7 @@ export function StepDetail({
       )}
 
       {/* Expected outcome */}
-      {step.expected_outcome && (
+      {'expected_outcome' in step && step.expected_outcome && (
         <div className="rounded-lg border border-border bg-white/[0.02] p-3">
           <h4 className="mb-1 text-xs font-medium text-muted-foreground">Expected Outcome</h4>
           <p className="text-sm text-muted-foreground">{resolve(step.expected_outcome)}</p>
@@ -181,7 +192,7 @@ export function StepDetail({
       )}
 
       {/* Notes */}
-      {step.notes_enabled !== false && (
+      {(!('notes_enabled' in step) || step.notes_enabled !== false) && (
         <div>
           <label className="mb-1 block text-xs font-medium text-muted-foreground">Notes</label>
           <textarea
@@ -195,7 +206,7 @@ export function StepDetail({
       )}
 
       {/* Reference link */}
-      {step.reference_url && (
+      {'reference_url' in step && step.reference_url && (
         <a
           href={resolve(step.reference_url)}
           target="_blank"