MCP server · Developer tools

MCP Log Proxy

Watch every message your AI sends to and receives from an MCP server, in a simple web page.

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MCP Log Proxy is a small helper program that sits between your AI and another MCP server, and shows you all the messages going back and forth. It is handy when something is not working as expected and you want to see what your AI actually asked for and what came back. If you like to peek under the hood, this is for you.

What is an MCP server? The 30-second version

On its own, your AI can only chat. An MCP server is a small helper program that gives your AI a new skill, like talking to another app or service. This tool is a helper for helpers: it stands in the middle between your AI and another MCP server, and shows you the traffic. So instead of guessing what happened, you can open a web page and read every message.

What this MCP server does

You start MCP Log Proxy and tell it the command that launches the MCP server you want to watch. Your AI then talks to the proxy instead of talking to the server directly. The proxy passes every message along and also shows it on a web page at http://localhost:5656. You open that page in your browser and see the full flow of messages, in order. If you run several proxies at once, the page lets you switch between them.

Flow diagram: you ask your AI “Show me the messages going to and from my MCP server”, on your own computer the MCP Log Proxy works with your own computer, and you get back A page with the full message list.

Click to zoom

What you can do with it

See every message your AI sends to an MCP server
See every reply the MCP server sends back
Open the log in your browser at a local web address
Switch between several running proxies on one page
Change the page title and port to keep things tidy
Save proxy errors to a log file you choose

Try asking your AI

“Show me the messages going to and from my melrose MCP server”
“Open the proxy page so I can see what my AI just asked for”
“Switch to my other running proxy instance and show its messages”
“What did the MCP server reply the last time I asked something”

What it gives back to you

It gives you a web page with the full list of messages, in the order they happened. You see what your AI sent and what the server sent back, side by side in time. It does not change anything by itself; it just shows you the flow. If you set a log file, errors from the proxy itself go there.

Before you start

What you need

The MCP Log Proxy program installed on your computer
The MCP server you want to watch, already working on your machine
A web browser to open the local page

Good to know

It only supports the STDIO kind of MCP server, and if you set the host flag to 0.0.0.0 the log page becomes reachable from other machines on your network.

Install it with your AI

Add MCP Log Proxy 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 MCP Log Proxy, 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.