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MCP Sniffer
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MCP Sniffer

MCP Sniffer is a reverse proxy tool used to capture network traffic between MCP clients and servers, providing a Web UI to visualize request and response data.
Developer toolsMonitoring#Network monitoring#Protocol analysis#Traffic capture#Development tools.Python
2.5 points
9.1K
Open Site

Overview

Content Details

Alternatives

What is MCP Sniffer?

MCP Sniffer is a reverse proxy tool that sits between MCP clients and servers to capture and analyze network traffic. It provides a web interface similar to Chrome DevTools' Network tab for inspecting MCP communications.

How to use MCP Sniffer?

Simply install the package and run it as a proxy between your MCP client and server. The web interface will automatically display all captured traffic for inspection.

Use Cases

Ideal for debugging MCP implementations, analyzing protocol behavior, and understanding client - server interactions during development.

Key Features

Traffic Inspection
Captures and displays all MCP requests and responses between client and server
Web Interface
User - friendly web UI for analyzing network traffic with filter and search capabilities
Easy Setup
Simple installation and configuration process with sensible defaults
Advantages
Non - intrusive monitoring without modifying client or server code
Real - time traffic visualization
Helpful for debugging and development
Limitations
Adds slight latency as it proxies all traffic
Currently only supports MCP protocol
Web UI is in early development stage

Getting Started

Installation
Install using pipx for isolated Python environment
Configuration
Configure the listening port and upstream server details
Access Web UI
Open the web interface in your browser to view captured traffic

Usage Scenarios

Debugging Connection Issues
Use MCP Sniffer to identify where communication breaks down between client and server
Performance Analysis
Measure request/response times to optimize your MCP implementation

Frequently Asked Questions

Does this affect my production traffic?
Can I use this with non - MCP protocols?
How do I contribute to the project?

Additional Resources

GitHub Repository
Source code and issue tracking
Model Context Protocol
Official MCP documentation
PyPI Package
Python package distribution

Installation

Copy the following command to your Client for configuration
Note: Your key is sensitive information, do not share it with anyone.

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