McpVanguard
An open-source security proxy and active firewall for the Model Context Protocol (MCP). It acts as a real-time 'Reflex System' between AI agents and their tools, protecting the host system from malicious intent, prompt injection, and data exfiltration.
McpVanguard is a security gateway for MCP agents that inspects traffic in real time and enforces security policy before sensitive calls reach the underlying tool. It works in local-first mode wrapping stdio MCP servers and in gateway mode exposing hardened SSE and Streamable HTTP endpoints. Transparent integration without rewriting existing MCP servers.
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- PParker ClarkMay 21, 2026
Active firewall approach prevents malicious payloads from reaching agent workflows.
- EElliot GarciaApr 23, 2026
Security proxy and active firewall for MCP — protection against malicious tool calls.
- RRiley WhiteApr 18, 2026
Good for teams who need to audit and filter MCP traffic in production.
- DDrew WilsonApr 15, 2026
Open-source means the security rules are transparent and auditable.