Show HN: MCP Defender – OSS AI Firewall for Protecting MCP in Cursor/Claude etc.

Re:Show HN: MCP Defender – OSS AI Firewall for Protecting MC... by quinnjh on Saturday May 31, 2025 @12:41AM (#44141884)

> What’s to stop an attacker from using prompt injection against this firewall?

Clearly you need a firewall-firewall.

..defense in depth?

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Re:Show HN: MCP Defender – OSS AI Firewall for Protecting MC... by gsundeep on Saturday May 31, 2025 @03:43AM (#44142675)

We'll soon be adding the ability to have multiple models perform the scan in parallel, so any attack would have to bypass all of the models.

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Re:Show HN: MCP Defender – OSS AI Firewall for Protecting MC... by superb_dev on Saturday May 31, 2025 @04:26PM (#44146742)

So literally a firewall-firewall?

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