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MCP Sniffer
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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 InspectionCaptures and displays all MCP requests and responses between client and server
Web InterfaceUser-friendly web UI for analyzing network traffic with filter and search capabilities
Easy SetupSimple installation and configuration process with sensible defaults
Pros and Cons
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
InstallationInstall using pipx for isolated Python environment
ConfigurationConfigure the listening port and upstream server details
Access Web UIOpen the web interface in your browser to view captured traffic
Usage Scenarios
Debugging Connection IssuesUse MCP Sniffer to identify where communication breaks down between client and server
Performance AnalysisMeasure request/response times to optimize your MCP implementation
Frequently Asked Questions
1
Does this affect my production traffic?No, it's designed for development use only. The slight latency added makes it unsuitable for production monitoring.
2
Can I use this with non-MCP protocols?Currently no, it's specifically designed for the Model Context Protocol.
3
How do I contribute to the project?The project is open source on GitHub. You can submit issues or pull requests to the repository.
Additional Resources
GitHub RepositorySource code and issue tracking
Model Context ProtocolOfficial MCP documentation
PyPI PackagePython package distribution
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