Every website and app, vibe-coded or not, hides front-end and server errors in the background, especially once there are real users. FaultFixer catches these issues, generates an AI-powered diagnosis, & notifies you across multiple channels. The magic: it plugs into Claude, Codex, Cursor & other AI tools beautifully over MCP so your AI fixes the bug with full context. And, you always keep staying inside your AI tool. Just say "list issues" to your Claude, Cursor.. (and "fix issues" later on).
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Maker
📌
Hey Product Hunt 👋
I've spent years in uptime monitoring, and one thing never changed: by the time you hear about a bug, a real user already hit it. That's even truer now with so many vibe-coded sites/apps that ship fast but with errors in the background.
I'm currently vibe-coding a web app with a friend, and we had lots of:
💬 "hey, x feature is not working"
🧑💻 "ok, share the console logs with me"
…and me copy-pasting all that into the AI dev tool I use for fixes.
I built FaultFixer to close that gap.
It does three things:
🔎 Detects front-end and server errors the moment they happen
🧠 Diagnoses each one with an AI analysis of the likely root cause — not just a stack trace
🔌 Connects to your AI dev tools over MCP. I just say "list issues" (and usually "fix issues" right after)
🔔 Notifies you across the channels you already use
It's built to be a diagnosis layer, not a blind auto-fixer. You (and your AI) stay in the loop and verify before shipping.
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How does the MCP setup actually feel in practice, especially with Cursor. Does it surface enough context for the AI to fix things confidently, or do you still end up copy pasting stack traces back and forth?
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Maker
@hiranurerkasap No copy-pasting the stack traces back and forth as these are handed to Cursor/Claude.. with the MCP request (list issues) together with the root-cause analysis (as FaultFixer only has the error logs and can not reach the code itself).
Cursor, now having the error logs and root-cause analysis, has everything to work on the fix (the MCP response especially mentions that "the analysis is an hypothesis and it must be checked against real code").
Also, once fixed, it asks if you want the issues to be marked as "resolved" and does so afterwards.
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Vibe-coding made me lazy at debugging. I just assume it all works. So, having them caought and everything working inside Claude is exactly what I need. Nice work.
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Maker
@aliakyildiz That was what happened to me too. Especially after the AI models getting so good. Yet, the rate of hitting errors probably didn't change as we all started asking for more complex code/features :). FaultFixer definitely removes the friction of checking errors/fixing process and helps building bug-free projects a lot.
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This is exactly what vibe coders like me need. From time to time I see the site break, I just can't tell why. Now I can close that gap. Good launch.
How does the MCP setup actually feel in practice, especially with Cursor. Does it surface enough context for the AI to fix things confidently, or do you still end up copy pasting stack traces back and forth?
@hiranurerkasap No copy-pasting the stack traces back and forth as these are handed to Cursor/Claude.. with the MCP request (list issues) together with the root-cause analysis (as FaultFixer only has the error logs and can not reach the code itself).
Cursor, now having the error logs and root-cause analysis, has everything to work on the fix (the MCP response especially mentions that "the analysis is an hypothesis and it must be checked against real code").
Also, once fixed, it asks if you want the issues to be marked as "resolved" and does so afterwards.
Vibe-coding made me lazy at debugging. I just assume it all works. So, having them caought and everything working inside Claude is exactly what I need. Nice work.
@aliakyildiz That was what happened to me too. Especially after the AI models getting so good. Yet, the rate of hitting errors probably didn't change as we all started asking for more complex code/features :). FaultFixer definitely removes the friction of checking errors/fixing process and helps building bug-free projects a lot.
This is exactly what vibe coders like me need. From time to time I see the site break, I just can't tell why. Now I can close that gap. Good launch.
@murat_bayral Thx a lot.
Yes, and that gap closes so naturally. Inside the AI dev tool, by just messaging like "list issues" - "fix issues".