TL;DR — The Gauntlet is an open-source Next.js app that connects 7 MCP servers through a LangChain multi-agent pipeline, then lets you toggle 8 failure modes live during execution. Built for conference demos. Watch agents break, fix, and break again — all in real time.
The Problem
If you've built anything with MCP (Model Context Protocol), you know the pattern: connect a few servers, wire up an agent, and watch it call tools. It works great until it doesn't.
The failures that hit production MCP systems are rarely about "the LLM chose the wrong tool." They're about:
Tool name collisions — two servers both expose search. Which one answers?
