MCP Client and MCP Server Quickstart

References

• MCP Server: https://modelcontextprotocol.io/quickstart/server
• MCP Client: https://modelcontextprotocol.io/quickstart/client

Result

Running Weather MCP server using Claude Desktop as MCP Host

• note: Claude Desktop is an example of MCP Host that can automatically create MCP Clients based on the configuration file.

Running Weather MCP Server using CLI as MCP Host and MCP Client that's created

Learning Notes

Notes

• MCP Client can developed both on the frontend side or on the backend side. In this example the MCP client are build using the Python backend.
• It's important to know the different between MCP Host and MCP Client
  • MCP host as 1 to n relationship to MCP Clients
  • MCP client has 1 to 1 relationship their respective MCP Server

Tips & Trics

• Use this to list mcp server

  ps aux | grep "weather.py" | grep -v grep
  

• example how to kill server

  kill 79200 79199
  

• how to open the claude config file

  code ~/Library/Application\ Support/Claude/claude_desktop_config.json
  

• If you are using virtual environment, make sure to do this

  # Create virtual environment and activate it
  uv venv
  source .venv/bin/activate
  
  # Install dependencies
  uv add "mcp[cli]" httpx
  

• make sure to install mcp server

  uv run mcp install main.py
  # change main.py to your entry filename
  

• How to resolve the issue of Claude Desktop kept on showing me error "MCP <serverName>: spawn uv ENOENT" and "Could not connect MCP server <serverName>".

  

  1. identify uv location

     which uv
     # /Users/shafie/.local/bin/uv
     

  2. open the config file

     code ~/Library/Application\ Support/Claude/claude_desktop_config.json
     

  3. update the "command": "uv" to "command": "/Users/shafie/.local/bin/uv"

     for example, from this

         "weather": {
           "command": "uv",
           "args": [
             "run",
             "--with",
             "mcp[cli]",
             "mcp",
             "run",
             "/Users/shafie/Documents/Github/mcp-server-weather/weather.py"
           ]
         }
     

     to this

         "weather": {
           "command": "/Users/shafie/.local/bin/uv",
           "args": [
             "run",
             "--with",
             "mcp[cli]",
             "mcp",
             "run",
             "/Users/shafie/Documents/Github/mcp-server-weather/weather.py"
           ]
         }
     

  4. Restart Claude Desktop, no more errors, servers are added

     

     you will see this

     

• CLI I used to run the MCP Client and MCP server while inside the repo of the MCP Client.

  uv run client.py ../mcp-server-quickstart/weather.py