N8n Preflight Agent

n8n Preflight Agent

Intelligent validation agent that gets your n8n workflows 90% ready before you even open n8n. Upload any workflow JSON from YouTube tutorials, community templates, or exports - this agent validates, tests, and fixes it automatically.

Capabilities

• Validates workflow JSON against 50+ known issues
• Tests APIs with real credentials (curl commands)
• Auto-fixes deprecated models, syntax errors, missing headers
• Detects platform-specific issues (Cloud vs Self-hosted)
• Learns new issues and remembers them for future validations
• Outputs clean, ready-to-import workflow

How to Use

1. Type /preflight or say "validate this n8n workflow"
2. Provide the workflow JSON file
3. Answer platform question (Cloud or Self-hosted)
4. Provide API credentials when asked
5. Review the preflight report
6. Import clean_workflow.json into n8n

Input Format

• n8n workflow JSON: Raw JSON export from n8n or copied from tutorials
• Platform: n8n Cloud or Docker/Self-hosted
• API Credentials: Keys for detected services (OpenAI, Supabase, HeyGen, etc.)

Output Format

═══════════════════════════════════════════════════════════════
🛫 PREFLIGHT REPORT: [workflow-name].json
═══════════════════════════════════════════════════════════════

PLATFORM: n8n Cloud / Self-hosted

API TESTS:
✅ OpenAI    - Connected (gpt-4o available)
✅ Supabase  - Connected (table "scripts" found)
⚠️ Webhook   - Cannot test (needs deployment)

AUTO-FIXED (X):
✅ text-davinci-003 → gpt-4o (Node 4)
✅ Added Authorization header (Node 7)
✅ $('HTTP').item → $('HTTP').first() (Node 9)

MANUAL TASKS (X):
1. Set webhook path after deployment
2. Review hardcoded URL in Node 12

📁 SAVED: clean_workflow.json

Ready for SaaS? Type /build-saas
═══════════════════════════════════════════════════════════════

What Gets Tested

API Connectivity (Real Calls)

Validation Checks

Critical (Auto-Fix):

• Deprecated AI models
• Missing Supabase headers
• Old expression syntax (.item → .first())

Warning (Flag for Review):

• Hardcoded credentials
• Ghost/orphan nodes
• Missing webhook path
• AI Agent without memory

Info:

• Credentials needed list
• Platform-specific notes

Confidence Levels

🟢 AUTO-FIX (Just do it):
   • Deprecated model names
   • Missing standard headers
   • Old expression syntax

🟡 SUGGEST (Show user, let them approve):
   • Removing nodes
   • Changing URLs
   • Modifying credentials structure

🔴 WARN ONLY (Just flag it):
   • Hardcoded credentials
   • Potential timeout issues
   • Complex nested loops

Learning System

When a NEW issue is discovered (not in the knowledge base):

1. Agent describes the issue found
2. Suggests a fix
3. Asks: "Add this to my knowledge? [YES / NO / EDIT]"
4. If YES → Appends to references/gotchas.md

This builds YOUR personal n8n expert knowledge base over time.

Example Usage

"Validate this n8n workflow"

"/preflight"

"Check this workflow for issues"

"Test if my APIs work in this workflow"

"Fix my broken n8n JSON"

Best Practices

1. Always run preflight BEFORE importing to n8n
2. Provide real API keys for accurate testing
3. Choose correct platform (Cloud vs Self-hosted)
4. Review manual tasks before importing
5. Use /build-saas after preflight for frontend generation

Limitations

• Cannot test webhooks (require deployment first)
• OAuth flows need manual re-authentication in n8n
• Some complex issues require manual intervention
• Credentials stay local (never sent anywhere)