MCP Defender

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MCP Defender

Be the first to leave feedback Emerging

AI-powered proxy scanning calls to block prompt and code injection.

Freemium API Security and Privacy
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MCP Defender AI tool screenshot

What is MCP Defender?

MCP Defender protects AI applications by scanning and filtering MCP tool calls in real time for AI app security.

It acts as a secure proxy that inspects requests and responses to identify and block prompt injection, tool poisoning, credential theft, arbitrary code execution, and remote command injection.



LLM-powered detection plus deterministic signatures provide layered threat detection; users can manage scan signatures and choose their own LLM provider and API keys.

Automatic protection runs in the background without modifying client apps and supports Cursor, Claude, Visual Studio Code and other MCP-integrated tools.



Logs and alerts give developers and security teams visibility into tool call activity and blocked threats for incident response and audit.

Open source and AGPL-3.0 licensed, suitable for teams that require deployable source code and policy control for AI tool security.

MCP Defender user reviews

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MCP Defender's key features

  • Real-time secure proxy analyzing communications between AI apps and MCP servers
  • LLM-powered malicious-activity detection combined with deterministic signature analysis
  • Configurable scan control with user-manageable signatures
  • Automated enforcement to allow or block MCP tool calls in real-time
  • Pluggable LLM provider support with custom API keys and integrations for Cursor, Claude, Visual Studio Code, and Windsurf

MCP Defender use cases

  • Protect enterprise AI assistants and agent tool integrations by deploying MCP Defender as a secure proxy to scan and filter all MCP tool calls in real time, blocking prompt injection, tool poisoning, and credential theft before they reach backend services
  • Harden customer-facing chatbots and virtual agents with MCP Defender to prevent remote command injection and arbitrary code execution by using LLM-powered detection and deterministic signatures to stop malicious prompts and data exfiltration
  • Secure developer CI/CD and automation pipelines that call external tools by routing tool calls through MCP Defender to monitor for compromised plugins, prevent credential leaks, and enforce policy compliance with open-source, auditable security controls

Who is it for?

  • Cybersecurity engineers
  • Software developers
  • System administrators
  • Data analysts
  • Infrastructure architects

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