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?

Clone MCPower Security Proxy from https://github.com/MCPower-Security/mcpower-proxy and configure it as an MCP server in your client (Claude Desktop, Cursor, or VS Code).

Is MCPower Security Proxy open source?

Yes, MCPower Security Proxy is open source under the Apache-2.0 license. Source code is available at https://github.com/MCPower-Security/mcpower-proxy.

What category does MCPower Security Proxy belong to?

MCPower Security Proxy is listed under Other MCP servers on MCPFind.

MCPower Security Proxy — MCP Server for Other

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:

VS Code Marketplace: Install Defenter
Open VSX (Cursor and others): Install Defenter
Claude Code: install Defenter plugin

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

Set up in your AI client

AI clientOperating system

Merge this template into ~/Library/Application Support/Claude/claude_desktop_config.json. Keep existing servers. Add any arguments, credentials, and permissions required by the maintainer; this template has not been install-tested.

json

{
  "mcpServers": {
    "io-github-ai-mcpower-mcpower-proxy": {
      "command": "uvx",
      "args": [
        "mcpower-proxy"
      ]
    }
  }
}

Restart Claude Desktop completely for changes to take effect. Confirm the server appears connected in the client’s tool list, then try a read-only example from its documentation.

Claude Desktop setup reference

Compatible MCP Clients

MCPower Security Proxy works with any MCP-compatible client. Copy the config snippet from the Configuration section above and add it to the file shown for your client, then restart the application.

Claude Desktop~/Library/Application Support/Claude/claude_desktop_config.jsonRestart Claude Desktop completely for changes to take effect.

Cursor~/.cursor/mcp.jsonRestart Cursor for changes to take effect.

VS Code.vscode/mcp.jsonReload VS Code window for changes to take effect.

Windsurf~/.codeium/windsurf/mcp_config.jsonRestart Windsurf for changes to take effect.

Claude Code.mcp.jsonSave at the project root, then start Claude Code in that project and review the MCP server approval prompt. Keep real credentials out of shared files.

MCPower Security Proxy