MCP Sniffer

@shivdeepak

Repository

Basic information

About MCP Sniffer

MCP Sniffer captures network traffic between MCP clients and servers and displays it in a web UI.

#mcp #devtools #developer-tools #model-context-protocol

MCP Sniffer config

No standard config provided

This server doesn't expose a parseable MCP config block in its README. See the repository for install instructions.

Repository

MCP Sniffer tools

Tool list not available yet

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Overview

What is MCP Sniffer?

MCP Sniffer captures network traffic between MCP clients and servers. It runs as a reverse proxy between the client and server, capturing request and response payloads that can be visualized in a web UI, similar to the Network tab in Chrome DevTools.

How to use MCP Sniffer?

Install via pipx install mcp-sniffer, then run the server using mcp-sniffer --listen-port <port> --upstream-port <port>. Configure host and port settings via command-line options or environment variables. Access the web UI at the default address http://127.0.0.1:8888.

Key features of MCP Sniffer

Acts as a reverse proxy between MCP client and server.
Captures request and response payloads in real time.
Web UI for visualizing captured traffic.
Configurable listen, upstream, and web UI hosts/ports.
Supports environment variables for all configuration options.
Log level can be adjusted via --log-level.

Use cases of MCP Sniffer

Debugging MCP client-server communication.
Inspecting MCP protocol payloads during development.
Monitoring MCP traffic for integration testing.

Frequently asked questions

What does MCP Sniffer do?

It sits as a reverse proxy between an MCP client and server, recording all request and response payloads, and displays them in a web interface for inspection.

How do I install MCP Sniffer?

Install it with `pipx install mcp-sniffer`. pipx is recommended for isolated Python application installation.

How do I configure MCP Sniffer?

Use command-line flags like `--listen-port`, `--upstream-port`, `--web-ui-host`, and `--web-ui-port`, or set the corresponding environment variables (`LISTEN_PORT`, `UPSTREAM_PORT`, etc.).

Where do I view captured traffic?

Open a browser to `http://127.0.0.1:8888` (or the configured web UI host/port) to see the web interface.

Can I change the log level?

Yes, use `--log-level` (e.g., `INFO`, `DEBUG`) or set the `LOG_LEVEL` environment variable.

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