MCPBouncer is a desktop action firewall & live packet inspector for AI IDEs (Cursor & Claude) using MCP. It intercepts local AI tool calls to prevent data destruction and credential leaks: • 🔍 Live Inspector: Desktop UI showing every tool call in real time. • 🚨 Human Approval: Destructive commands (rm -rf, DROP TABLE) pause for instant [ALLOW/BLOCK]. • 🔒 DLP: Automatically scrubs OpenAI, AWS & Stripe keys. • 📜 Local SHA-256 tamper-evident audit trail. • 100% offline & private.

Hi Product Hunt! 👋 I built MCPBouncer because giving autonomous AI coding assistants (Cursor, Claude Desktop) direct execution access to local databases, terminals, and file systems creates a massive security blindspot. One hallucinated `rm -rf /` or `DROP TABLE`, or an API key leaked via prompt injection, can be devastating. MCPBouncer solves this with a zero-dependency, local desktop firewall: • 🔍 Real-time packet inspector dashboard (`http://127.0.0.1:4114`) • 🚨 Instant Human-in-the-Loop approval for destructive operations • 🔒 Automatic DLP secret scrubbing (OpenAI, AWS, GitHub, Stripe) • 🦁 Prompt injection & Unicode steganography shield • 📜 Immutable SHA-256 local audit ledger • 100% offline & private I'd love to get your feedback and answer any questions!

MCPBouncer

Desktop Action Firewall & Inspector for Claude & Cursor MCP

Desktop Action Firewall & Inspector for Claude & Cursor MCP