Sevlex MCP Gateway

A production MCP (Model Context Protocol) security gateway that sits between AI agents and MCP servers. Intercepts, logs, and flags every tool call in real time.

What it does

• Intercepts every tool call between Claude and any MCP server
• Logs tool name, parameters, response, duration, session ID to Supabase
• Detects anomalies automatically:
  • Retry loop detection — same tool called 3+ times
  • Slow call detection — calls taking over 5 seconds
  • Large response detection — responses over 8KB
• Changes call status from allowed to flagged automatically
• API key auth tied to customer accounts

How it works

The gateway is a transparent stdio proxy. Claude thinks it's talking directly to the MCP server. The MCP server thinks it's talking directly to Claude. Every message passes through the gateway first.

Tech Stack

• Node.js
• MCP Protocol (stdio transport)
• Supabase (logging + auth)
• dotenv

Setup

Create a .env file: