Show HN: PreFlight – A local AST background daemon to catch AI code drift
PreFlight is a local AST daemon, MCP server, and VS Code extension that blocks hallucinated code, broken Supabase RLS policies, and silent schema drift in real-time as you type.
⚡ LAUNCH WEEKEND SPECIAL: Save over 85% on the PreFlight Pro Lifetime Founder's Pass. Use code DISCOUNTHUB at checkout to get it for $30 / ₹2,499 before it changes to a $19/month subscription this Sunday night.
Local AST daemon · MCP · VS Code companion
Stop AI Agents from Breaking Your Production Database Architecture.
PreFlight is a local AST background daemon, MCP server, and VS Code extension that blocks hallucinated code, broken Supabase RLS policies, and silent schema drift in real-time as you type.
View Interactive Quick StartInstall Extension via VS Marketplace
hard block caught on save
PREFLIGHT HARD BLOCK Detected: RLS_DRIFT File: app/api/profiles/route.ts:42 Evidence: AI-generated mutation bypasses tenant boundary Action: preflight fix app/api/profiles/route.ts
The Eye is watching
Save-time alerts in VS Code/Cursor. Native Windows popup fallback when no extension client is connected.
Interactive Quick Start
The developer flow: free first, upgrade later.
No account wall. No key required to start watching. Try the local daemon, then unlock unlimited remediation when the Founder's Key is in hand.
1Step 1
Start Free (Local Sandbox)
Install PreFlight locally to get 10 complimentary structural fixes to test the AST engine in your editor without an account.
terminal
$npm install -g preflight-pro@latest
$preflight start
2Step 2
Upgrade Anytime (Unlock Unlimited Lifetime Access)
Once you have your Founder's Key, authenticate instantly via the CLI to lift all restrictions.
terminal
$preflight auth YOUR_LIFETIME_KEY
High-Velocity Drift
AI coding tools move fast, but they don't know your deep structural architecture boundaries.
Silent Bypasses
A single hallucinated clause can accidentally bypass a critical Supabase RLS policy or security guardrail.
Local Prevention
Don't wait for a failed CI/CD pipeline or a broken production database. Catch it in the editor as you type.
All-in weekend offer
Founder's Lifetime Pass
$35 / ₹3,000 (Standard Lifetime)
$30 / ₹2,499
One-Time Payment
Strictly limited to launch weekend. Permanently changes to a recurring $19/month subscription on Sunday night.
Full local CLI background daemon (forever)
Real-time VS Code Companion Extension (forever)
Advanced MCP Server for Claude/Cursor integration (forever)
Lifetime updates with zero recurring fees or hidden expirations
Global checkout
🏷️ Use code DISCOUNTHUB at checkout for the $30 weekend rate
Pay by card and receive your Founder's Key after confirmation.
Open Polar Checkout
⚠️ Beta Architecture & Safety Notice: PreFlight Pro is currently in active Beta. While our local AST daemon is designed to catch severe structural anomalies, hallucinated syntax, and potential Supabase RLS drifts in real-time, it does not guarantee 100% error elimination. AI-assisted code should always be explicitly reviewed by a senior engineer before being pushed to a production environment. Use PreFlight as an advanced automated guardrail, not a replacement for manual code review.