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Test MCP Client

Validate your MCP client implementation using our hosted mock servers. Test echo responses, authentication, and error handling.

Select Demo Server

Choose a demo server to test your MCP client implementation

Connection Details

Server URL:

/mcp-echo-server

Token:

Not required

Available Test Servers

We provide several hosted MCP servers designed to test different aspects of your client implementation:

  • Echo Server: Returns whatever you send - perfect for testing basic connectivity and message handling
  • Auth Server: Requires Bearer token authentication - test your auth flow implementation
  • Error Server: Deliberately returns various error responses - validate your error handling
  • Complex Server: Includes multiple tools with different schemas - test parameter validation

What to Test in Your MCP Client

A robust MCP client should handle these scenarios correctly:

  • Connection lifecycle: Initialize, maintain, and gracefully close connections
  • Capability negotiation: Correctly advertise and respect server capabilities
  • Tool discovery: List and cache available tools from the server
  • Tool execution: Call tools with proper arguments and handle responses
  • Error handling: Gracefully handle network errors, timeouts, and protocol errors
  • Authentication: Properly send and refresh credentials when required

Building an MCP Client?

If you're implementing an MCP client from scratch, the official MCP SDK provides client libraries for:

  • TypeScript/JavaScript (Node.js)
  • Python

Once you've built your client, test it against our servers here, then try connecting to real servers from the MCP servers directory.