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MCP Client Tester

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Introduction to MCP Client Tester

Welcome to MCP Client Tester

MCP Client Tester is a comprehensive testing and debugging tool designed specifically for Model Context Protocol (MCP) developers and implementers. Whether you’re building MCP servers, developing MCP clients, or integrating MCP into existing systems, this tool provides essential insights into protocol behavior, client capabilities, and connection debugging.

What is MCP Client Tester?

MCP Client Tester serves as a specialized MCP server that records, analyzes, and reports on all MCP protocol interactions. It supports multiple transport protocols and provides detailed logging, session management, and client detection capabilities.

Protocol Testing

Test all MCP protocol features including tools, resources, prompts, sampling, and elicitation with comprehensive logging.

Client Detection

Automatically detect and analyze MCP client capabilities, versions, and supported features.

Multi-Transport Support

Support for STDIO, HTTP, SSE, and HTTP-streaming transports with detailed connection analytics.

Real-time Monitoring

Live protocol monitoring with WebSocket-based updates and session management.

Key Features

Comprehensive Protocol Support

  • All Transport Types: STDIO, HTTP, Server-Sent Events (SSE), HTTP streaming
  • Full Protocol Coverage: Tools, resources, prompts, sampling, elicitation, progress, cancellation
  • Real-time Logging: Complete request/response logging with timing information
  • Session Management: Track multiple concurrent client connections

Client Analysis & Detection

  • Automatic Client Detection: Identify client types, versions, and capabilities
  • Capability Matrix: Comprehensive testing of supported MCP features
  • Performance Metrics: Connection timing, message throughput, error rates
  • Compatibility Testing: Validate client implementations against MCP specification

Developer Experience

  • Web-based Interface: Modern, responsive dashboard for monitoring and testing
  • RESTful API: Programmatic access to all testing and monitoring functions
  • Detailed Reporting: Export session data, test results, and client profiles
  • Integration Testing: Built-in MCP client for comprehensive server testing

Use Cases

MCP Server Development

  • Protocol Validation: Ensure your MCP server correctly implements all protocol features
  • Client Compatibility: Test how different MCP clients interact with your server
  • Performance Optimization: Identify bottlenecks and optimize message handling
  • Feature Testing: Validate tools, resources, and advanced features work correctly

MCP Client Development

  • Server Integration: Test your client against various MCP server implementations
  • Protocol Compliance: Validate your client follows MCP specification correctly
  • Feature Detection: Test client capability detection and feature negotiation
  • Error Handling: Validate error conditions and recovery mechanisms

System Integration

  • End-to-End Testing: Validate complete MCP-based workflows
  • Load Testing: Test system behavior under various load conditions
  • Monitoring: Ongoing monitoring of MCP connections in production
  • Troubleshooting: Debug connection issues and protocol problems

Architecture Overview

graph TD
    A[MCP Clients] -->|Multiple Transports| B[MCP Client Tester]
    B --> C[Protocol Logger]
    B --> D[Session Manager]
    B --> E[Client Detector]
    B --> F[Web Interface]


    C --> G[(Session Data)]
    D --> G
    E --> H[(Client Database)]


    F --> I[REST API]
    F --> J[WebSocket Updates]
    F --> K[Dashboard]

The MCP Client Tester acts as an intermediary MCP server that:

  1. Accepts Connections: Supports all MCP transport protocols
  2. Logs Interactions: Records all protocol messages with detailed metadata
  3. Analyzes Clients: Detects client capabilities and characteristics
  4. Provides Interface: Web-based dashboard for monitoring and analysis
  5. Offers APIs: RESTful and WebSocket APIs for programmatic access

Getting Started

Ready to start testing your MCP implementations? Here are your next steps:

Quick Start Guide

Get up and running in minutes with Docker Compose and basic configuration. Start Here →

Installation Guide

Detailed installation instructions for different deployment scenarios. Install Now →

Web Interface Tour

Explore the web interface and learn about monitoring capabilities. Take the Tour →

API Reference

Complete API documentation for programmatic access and integration. View API Docs →

Community and Support

  • Documentation: Comprehensive guides, tutorials, and API references
  • Examples: Real-world usage examples and integration patterns
  • Troubleshooting: Common issues and debugging guides
  • Best Practices: Recommended testing strategies and patterns

Ready to dive deeper? Continue with our Quick Start Guide to get your first MCP testing session running in minutes.