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

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

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