MCP Shield

@riseandignite

Basic information

About MCP Shield

Security scanner for MCP servers

MCP Shield config

Add this server to your MCP-compatible client using the configuration below.

{
  "mcpServers": {
    "mcp-shield": {
      "command": "npx",
      "args": [
        "mcp-shield"
      ]
    }
  }
}

MCP Shield tools

Tool list not available yet

This listing does not currently have a tool list to display. This does not mean the server has no tools; check its documentation for supported capabilities.

Fetch the live tool list by running this server in a temporary sandbox using the button above.

Overview

What is MCP-Shield?

MCP-Shield scans your installed MCP (Model Context Protocol) servers and detects vulnerabilities such as tool poisoning attacks, data exfiltration channels, and cross-origin escalations. It is for developers and security teams who integrate MCP servers into AI workflows.

How to use MCP-Shield?

Run npx mcp-shield to scan standard MCP configuration locations. Use --path <path> to scan a specific config file, --claude-api-key <key> for enhanced AI analysis, --identify-as <client> to test client‑specific behavior, and --safe-list <servers> to exclude trusted servers. Run npx mcp-shield -h for full help.

Key features of MCP-Shield

Detects hidden instructions, exfiltration, and tool shadowing
Identifies sensitive file access attempts
Detects cross‑origin violations between servers
Supports Cursor, Claude Desktop, Windsurf, VSCode, Codeium configs
Optional Claude AI integration for deeper analysis
Safe‑list functionality to exclude trusted servers

Use cases of MCP-Shield

Scan new MCP servers before adding them to your environment
Regular security audits of your MCP configuration
Validate security during MCP server development
Verify no regression after updating MCP servers

Frequently asked questions

What vulnerability types does MCP-Shield detect?

It detects tool poisoning with hidden instructions, data exfiltration channels, tool shadowing and behavior modification, sensitive file access attempts, and cross‑origin violations between servers.

How do I use MCP-Shield with the Claude API?

Pass the `--claude-api-key YOUR_API_KEY` flag when running the scan. This enables AI‑powered analysis that provides detailed risk assessments and explanations for each detected vulnerability.

Can I scan a specific configuration file?

Yes, use the `--path <path>` option to point to a specific MCP config file (`.mcp/*.json` or `claude_desktop_config.json`). If omitted, MCP-Shield scans standard locations on your system.

Does MCP-Shield support a safe list?

Yes, use `--safe-list "server1,server2"` to exclude those servers from scanning and from cross‑origin violation detection.

What MCP client configurations does it support?

It supports Cursor, Claude Desktop, Windsurf, VSCode, and Codeium configuration files.

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