MCP server · Security
Arc Gate MCP server
Adds a safety checkpoint between your AI and other tools, so harmful instructions hidden in tool results get blocked.
Arc Gate MCP is a small safety helper that sits between your AI assistant and the other tools it uses. Every time a tool sends something back, Arc Gate checks it first and blocks sneaky instructions that try to hijack your AI. It is handy for anyone who lets their AI browse the web, read documents, or pull in outside data.
What is an MCP server? The 30-second version
On its own, your AI can only chat with you. An MCP server is a small helper program that gives your AI a new skill or a connection to another app or service. This one is a safety checkpoint: it stands between your AI and the other MCP servers you use, here watching the results that come back from tools like a web fetcher. When something suspicious is hiding inside a tool result, Arc Gate stops it before your AI ever sees it.
What this MCP server does
You connect Arc Gate to your AI assistant and tell it which other tool it should guard, for example a web page fetcher. When you ask your AI to look something up, that tool goes and gets the result. Before the result reaches your AI, Arc Gate reads it and checks for hidden instructions or misuse of the tool's permissions. If the result looks safe, your AI gets it and answers you. If it looks like an attack, Arc Gate blocks it so your AI is not tricked.
Click to zoomWhat you can do with it
- Guard a web browsing tool so hidden instructions in pages cannot reach your AI
- Guard a document search tool used for reading your files or knowledge base
- Pick a policy mode that matches your use case, like browser_agent or finance_agent
- Run it as a layer in front of any MCP server you already use
- Use a strict mode when you want the tightest enforcement
- Plug it into Claude Desktop with a small config change
Try asking your AI
- “Fetch this news article and summarize it for me”
- “Look up the current price of this stock and tell me what changed today”
- “Search my documents for anything about the new policy and give me the key points”
- “Open this web page and pull out the contact details”
What it gives back to you
You get the same kind of answer you would normally get from your AI, like a summary, a list, or a short reply. The difference is that unsafe tool results are quietly filtered out before they reach the AI. If something was blocked, your AI simply will not act on the hidden instructions. You usually just see a normal answer, with the risky parts removed.
Before you start
What you need
- Python installed on your computer (the README uses pip to install it)
- The uvx tool if you want to run it the way the README shows
- At least one other MCP server for it to guard, like a web fetcher
- The Claude desktop app if you want to use the example config
Good to know
It is a safety layer, not a guarantee, so keep an eye on what your AI is allowed to do and which tools you connect behind it.
Install it with your AI
Add Arc Gate MCP server to your AI, no technical skills needed
You don't install anything by hand. You copy one prompt, paste it into an AI that can work on your computer, and it checks, installs and connects the server for you, asking you when it needs something.
Sign in to get the install prompt
Members get a ready-made prompt that lets the Claude desktop app check Arc Gate MCP server, install it and connect it for them, step by step. You don't need any technical skills: you copy, paste and answer a few questions. Your connected AI can also find and install any of the 4,066 MCP servers here for you.
Who it's for
People who let their AI browse the web or read outside documents and want a safety layer against hidden instructions, especially in security, finance, or research roles.
