diff --git a/backend/app/services/flowpilot_engine.py b/backend/app/services/flowpilot_engine.py
index e97c36b9..a2c4c6a0 100644
--- a/backend/app/services/flowpilot_engine.py
+++ b/backend/app/services/flowpilot_engine.py
@@ -48,7 +48,7 @@ Your response MUST be a valid JSON object with one of these shapes:
 {"type": "question", "content": "Brief description", "reasoning": "Internal why", "context_message": "Shown to engineer", "options": [{"label": "Human text", "value": "machine_value", "followup_hint": "or null"}], "allow_free_text": true, "allow_skip": true, "confidence": 0.65}
 
 2. Suggested action:
-{"type": "action", "content": "What to do", "reasoning": "Internal why", "context_message": "Here's what to try", "action_type": "instruction | script_generation | verification | info_request", "expected_outcome": "What success looks like", "confidence": 0.78}
+{"type": "action", "content": "What to do", "reasoning": "Internal why", "context_message": "Here's what to try", "action_type": "instruction | script_generation | verification | info_request | open_script_builder", "expected_outcome": "What success looks like", "confidence": 0.78}
 
 3. Resolution suggestion:
 {"type": "resolution_suggestion", "content": "Summary of what we did", "reasoning": "Internal why", "resolution_summary": "Issue was caused by X, fixed by Y", "confidence": 0.92, "follow_up_recommendations": ["Monitor for 24 hours"]}\
@@ -76,6 +76,7 @@ Every response must have a "type" field: "question", "action", or "resolution_su
 - confidence is a float 0.0-1.0 reflecting how certain you are about the diagnosis path
 - When multiple symptoms point to one root cause with >90% confidence, suggest resolution
 - If you detect the engineer needs a PowerShell script, suggest a script_generation action
+- When the engineer needs a custom script that doesn't match an existing template, suggest opening the Script Builder. Use action_type "open_script_builder" with a "script_prompt" field containing a clear description of what the script should do, and a "script_language" field (powershell, bash, or python).
 - Never suggest restarting or rebooting as a first step — diagnose first
 - Be specific: "Check Event Viewer > System > source NTFS" not "check the logs"
 
diff --git a/frontend/src/components/flowpilot/FlowPilotStepCard.tsx b/frontend/src/components/flowpilot/FlowPilotStepCard.tsx
index b74b4458..86405c5d 100644
--- a/frontend/src/components/flowpilot/FlowPilotStepCard.tsx
+++ b/frontend/src/components/flowpilot/FlowPilotStepCard.tsx
@@ -167,8 +167,26 @@ export function FlowPilotStepCard({ step, isCurrentStep, isProcessing, sessionId
             />
           )}
 
+          {/* Script Builder handoff */}
+          {!isResolutionSuggestion && step.step_type === 'action' && (content.action_type as string) === 'open_script_builder' && (
+            <button
+              onClick={() => {
+                sessionStorage.setItem('scriptBuilderContext', JSON.stringify({
+                  from_session: sessionId,
+                  prompt: (content.script_prompt as string) || '',
+                  language: (content.script_language as string) || 'powershell',
+                }))
+                window.open('/script-builder?from=flowpilot', '_blank')
+                onRespond({ action_result: { success: true, details: 'Opened Script Builder' } })
+              }}
+              className="flex-1 min-h-[44px] rounded-lg bg-gradient-brand px-4 py-2.5 text-sm font-semibold text-[#101114] hover:opacity-90 active:scale-[0.97] transition-all"
+            >
+              Open Script Builder
+            </button>
+          )}
+
           {/* Action step buttons */}
-          {!isResolutionSuggestion && step.step_type === 'action' && (content.action_type as string) !== 'script_generation' && (
+          {!isResolutionSuggestion && step.step_type === 'action' && (content.action_type as string) !== 'script_generation' && (content.action_type as string) !== 'open_script_builder' && (
             <div className="flex flex-col gap-2 sm:flex-row">
               <button
                 onClick={() => handleActionComplete(true)}