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


MCP Defender is an AI Firewall designed to monitor and protect Model Context Protocol (MCP) communications. It intercepts tool calls and responses, verifying them against security signatures.

Use MCP Defender with your preferred AI provider or our hosted service for seamless security.

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Cursor

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Claude

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firewall

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