VFault — AI Hallucination Detector for VS Code

Verification at the fault lines.

VFault catches hallucinated function names, deprecated APIs, and outdated parameters in AI-generated code. It checks against parsed source code — no AI in the verification layer.

Works with VS Code and Cursor.

What it does

When you save a PHP, Python, JavaScript, or Laravel file, VFault sends the function names to the VFault API and marks them inline:

🔴 Red underline — Function not found in any known API. Likely hallucinated by your AI assistant. Hover for suggestions.
🟡 Yellow underline — Function exists but is deprecated. Hover for the replacement.
🟢 Green dotted underline — Function verified. Hover for version info.

Quick-fix code actions let you replace hallucinated names with the correct function in one click.

Features

Verify on save — automatic, debounced, no keystroke noise
Command palette — VFault: Verify Current File for manual trigger
Verify selection — check just the code you've highlighted
Look up function — query a single function name from the palette
Status bar — live summary: "VFault: 12 verified, 2 issues"
Quick fixes — one-click replacements for hallucinated function names
Autocomplete — VFault suggests verified function names as you type
Hover details — full verification info on hover
Per-language toggle — enable/disable for PHP, Python, JS, Laravel independently
Custom API URL — point at your own VFault instance or the public API

Supported shards

Shard	Status
WordPress	✅ Free, live now
Python	🔒 Paid tier (coming soon)
JavaScript	🔒 Paid tier (coming soon)
Laravel	🔒 Paid tier (coming soon)

Getting started

Install the extension from the VS Code Marketplace
Open any PHP file containing WordPress function calls
Save the file — VFault highlights issues automatically
Hover over underlined functions for details
Use the lightbulb (quick fix) to replace hallucinated names

No API key required for the WordPress shard.

Settings

Setting	Default	Description
`vfault.apiUrl`	`https://exceedweb.pythonanywhere.com`	VFault API base URL
`vfault.verifyOnSave`	`true`	Verify automatically on file save
`vfault.enabledLanguages`	All enabled	Enable/disable per language
`vfault.showVerifiedHints`	`true`	Show green indicators on verified functions
`vfault.debounceMs`	`500`	Delay before API call after save

Commands

Command	Description
`VFault: Verify Current File`	Manually verify the active file
`VFault: Verify Selection`	Verify only the selected code
`VFault: Look Up Function`	Look up a single function by name
`VFault: Clear Diagnostics`	Remove all VFault underlines

How it works

VFault is a deterministic verification gateway. It parses your code to find function calls, then checks each one against curated API shards built from real source code. No LLM in the loop — the verification layer is pure lookup against parsed, versioned function signatures.

This means:

Zero false confidence — if VFault says it's verified, the function exists in the source
Deprecation warnings include the exact version it was deprecated and the replacement
Suggestions for hallucinated names come from fuzzy matching against real functions

Links

Built by Ian Fraser / Exceed Web Services