Correct way to create mcp client?

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Summary

The provided code snippet attempts to create an McpClient instance using the CreateAsync method, passing in a Uri base address and an API key. However, the code may not be entirely correct, especially when dealing with multiple servers and API keys. The main issue lies in the way HttpClient instances are created and managed.

Root Cause

The root cause of the issue is:

  • Incorrect usage of HttpClient instances, leading to socket exhaustion
  • Insufficient handling of API keys for multiple servers
  • Lack of proper error handling and retries for HTTP requests

Why This Happens in Real Systems

This issue occurs in real systems due to:

  • HttpClient being designed for reuse, but not being reused correctly
  • API keys not being properly rotated or managed
  • HTTP requests not being properly retried or handled in case of errors
  • Rate limiting being enforced by the API, resulting in 429 Too Many Requests errors

Real-World Impact

The real-world impact of this issue includes:

  • Service unavailability due to socket exhaustion
  • API key exposure or misuse
  • Increased latency due to retries and error handling
  • Decreased system reliability and availability

Example or Code (if necessary and relevant)

public async Task CreateAsync(Uri baseUri, string apiKey)
{
    var httpClient = new HttpClient();
    var transport = new HttpClientTransport(
        new HttpClientTransportOptions
        {
            Endpoint = baseUri,
            AdditionalHeaders = new Dictionary
            {
                { "Ocp-Apim-Subscription-Key", apiKey }
            }
        });
    return await McpClient.CreateAsync(transport);
}

However, a better approach would be to use a singleton instance of HttpClient or manage the instances properly using a factory or a pool.

How Senior Engineers Fix It

Senior engineers fix this issue by:

  • Using a singleton instance of HttpClient or managing instances properly
  • Implementing proper API key rotation and management
  • Handling HTTP requests with retries and error handling
  • Implementing rate limiting and caching to reduce the load on the API
  • Using async/await correctly to avoid blocking and improve responsiveness

Why Juniors Miss It

Juniors may miss this issue due to:

  • Lack of understanding of HttpClient usage and best practices
  • Insufficient knowledge of API key management and security
  • Limited experience with HTTP requests and error handling
  • Inadequate testing and debugging of the code
  • Not considering the real-world impact of the code on the system and users

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