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MCPower Security Proxy

Official registry Security

Security proxy that wraps MCP servers with real-time monitoring and policy enforcement

Source code Documentation

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

PYPI package mcpower-proxy
Claude Code 
claude mcp add mcpower-security-proxy -- uvx mcpower-proxy==0.0.87
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "mcpower-security-proxy": {
            "command": "uvx",
            "args": [
                "mcpower-proxy==0.0.87"
            ]
        }
    }
}

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Contents
  1. Defenter
  2. 🚀 How to use
  3. Overview
  4. Architecture and how it works
  5. References

Defenter

Real-time semantic security for AI coding agents and MCP tools in VS Code, Claude Code and Cursor.

Defenter monitors every prompt, every coding agent tool call, every MCP server call, and key file and shell operations in your IDE. It acts as a semantic policy broker that understands what agents are doing, not just where they send data, so you can use AI coding agents without leaking secrets or customer data.

🚀 How to use

The simplest way to use Defenter is to install the VS Code or Cursor extension:

Once installed, the extension automatically intercepts and protects:

  • MCP server calls
  • Coding agent prompts and responses
  • File reads and shell commands triggered by the agent

No manual MCP configuration is needed.

Overview

Defenter is a semantic policy broker for AI coding agents. It adds an intelligent security layer inside your IDE that:

  • Intercepts every coding agent prompt and action
  • Wraps every MCP tool call and response
  • Analyzes the payload for sensitive information and risky behavior in real time
  • Enforces your security policies with allow, redact, or block decisions

Traditional security tools cannot see what an agent is about to share or execute. They look at apps and destinations, not at the intent and content of an agent’s actions.

Defenter bridges this gap by:

  • Preventing data leaks and context contamination
  • Providing clear, visual monitoring of every agent decision

Architecture and how it works

This repository contains the Defenter proxy and related components that secure MCP and coding agent traffic.

Defenter is built as a Python based proxy and local middleware that the IDE extension uses to enforce policy. At a high level:

  • Local middleware layer
    • Runs on the developer machine
    • Hooks coding agent prompts, file reads, and shell executions
    • Intercepts all MCP tool calls and responses
    • Performs client side redaction of secrets and PII
  • Cloud powered policy engine
    • Receives a minimal, redacted payload
    • Uses a classifier and analyzer to check for data leaks, context contamination, and prompt injection
    • Returns Allow, Redact, Need more info, or Block decisions in real time
    • Works with low latency to make sure the development flow in without friction
  • IDE integration
    • Seamless integration with VS Code and Cursor extensions
    • Shows a live monitoring view of all agent actions and Defenter decisions directly inside the IDE

Together, these pieces let you harness AI coding agents and MCP tools without compromising the security of your code, data, or workflows.

References

Python Proxy: See src/README.md for detailed implementation documentation

VSC Extension: See targets/vsc-extension/README.md for installation and user guide

Frequently asked questions

What is MCPower Security Proxy?

Security proxy that wraps MCP servers with real-time monitoring and policy enforcement

How do I install MCPower Security Proxy?

It runs on your machine. In Claude Code: claude mcp add mcpower-security-proxy -- uvx mcpower-proxy==0.0.87. For other clients, paste the JSON configuration from this page into their MCP settings.

Does MCPower Security Proxy need an API key?

Its registry entry lists no required key or secret. Some features may still need an account with the service it connects to.

Is MCPower Security Proxy open source?

Yes. Its code is on GitHub under the Apache-2.0 license.

Who maintains MCPower Security Proxy?

It is published by MCPower-Security. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.