MCP Gateway

@lasso-security

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基本情報

カテゴリ

開発者ツール

ライセンス

MIT

トランスポート

stdio

作者

lasso-security

MCP Gateway について

A plugin-based gateway that orchestrates other MCPs and allows developers to build upon it enterprise-grade agents.

#python #agent #proxy #mcp #gateway #generative-ai #gen-ai #genai#genai-security#mcp-server #mcp-client #agent-security #mcp-security

MCP Gateway の設定

以下の設定を使って、このサーバーを MCP 対応クライアントに追加してください。

{
  "mcpServers": {
    "mcp-gateway": {
      "command": "mcp-gateway",
      "args": [
        "--mcp-json-path",
        "~/.cursor/mcp.json",
        "--enable-guardrails",
        "basic",
        "--enable-guardrails",
        "presidio"
      ],
      "servers": {}
    }
  }
}

MCP Gateway のツール

Provides information about all available proxied MCPs to help LLMs choose appropriate tools and resources

Executes capabilities from any proxied MCP after sanitizing the request and response

概要

What is MCP Gateway?

MCP Gateway is an intermediary between large language models and other MCP servers. It centralizes and enhances AI infrastructure by reading server configurations from a mcp.json file, managing server lifecycles, intercepting requests and responses to sanitize sensitive information, and providing a unified interface to discover and interact with all proxied servers. It also includes a security scanner that analyzes server reputation and risks before loading.

How to use MCP Gateway?

Install with pip install mcp-gateway. Start the server by running mcp-gateway with the --mcp-json-path flag pointing to your configuration file and the --plugin flag for each plugin to enable (e.g., -p basic -p presidio). You can also run it inside Docker or as a Python module. Configuration is placed under the mcpServers key in your editor’s settings (Cursor, Claude Desktop, etc.) with the gateway itself configured as an MCP server.

Key features of MCP Gateway

Automatically masks common secrets (API keys, tokens, etc.)
PII masking via the Presidio plugin (credit cards, emails, etc.)
Lasso Security guardrails for prompt injection and data leakage
Tracing and monitoring of all tool calls with the Xetrack plugin
Unified interface to discover and invoke tools from all proxied MCPs
Security scanner that checks server reputation before loading

Use cases of MCP Gateway

Protect sensitive credentials and PII from exposure to LLMs.
Audit and debug MCP tool usage with request/response logs.
Centralize management of multiple MCP servers behind one endpoint.
Enforce custom AI safety policies with a cloud-based guardrail.

よくある質問

What plugins are available out of the box?

The README describes three guardrail plugins: `basic` (secret masking), `presidio` (PII masking), and `lasso` (full security guardrails). There is also a tracing plugin called `xetrack`.

How do I install the Presidio plugin?

`pip install mcp-gateway[presidio]` installs the extra dependency required for PII masking.

Does MCP Gateway require an API key?

Only the `lasso` plugin requires a `LASSO_API_KEY` environment variable (obtained from Lasso Security). The other plugins work without an external API key.

How are MCP servers configured under the gateway?

You place other MCP server configurations inside a `"servers"` key within the gateway’s own entry in your `mcpServers` configuration. The gateway reads them from the `mcp.json` file specified with `--mcp-json-path`.

Where are logs and trace data stored?

For the `xetrack` plugin, logs are written to a file path set via `XETRACK_LOGS_PATH`, and structured data is stored in an SQLite database at the path set via `XETRACK_DB_PATH`.

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