Running this sample

-1- Install the dependencies

dotnet restore

-2- Run the sample

dotnet run

-3- Test the sample

Start a separate terminal before you run the below (ensure the server is still running).

With the server running in one terminal, open another terminal and run the following command:

npx @modelcontextprotocol/inspector http://localhost:3001

This should start a web server with a visual interface allowing you to test the sample.

Make sure that the Streamable HTTP is selected as the transport type, and URL is http://localhost:3001/mcp.

Once the server is connected:

try listing tools and run add, with args 2 and 4, you should see 6 in the result.
go to resources and resource template and call "greeting", type in a name and you should see a greeting with the name you provided.

Testing in CLI mode

You can launch it directly in CLI mode by running the following command:

npx @modelcontextprotocol/inspector --cli http://localhost:3001 --method tools/list

This will list all the tools available in the server. You should see the following output:

{
  "tools": [
    {
      "name": "AddNumbers",
      "description": "Add two numbers together.",
      "inputSchema": {
        "type": "object",
        "properties": {
          "a": {
            "description": "The first number",
            "type": "integer"
          },
          "b": {
            "description": "The second number",
            "type": "integer"
          }
        },
        "title": "AddNumbers",
        "description": "Add two numbers together.",
        "required": [
          "a",
          "b"
        ]
      }
    }
  ]
}

To invoke a tool type:

npx @modelcontextprotocol/inspector --cli http://localhost:3001 --method tools/call --tool-name AddNumbers --tool-arg a=1 --tool-arg b=2

You should see the following output:

{
  "content": [
    {
      "type": "text",
      "text": "3"
    }
  ],
  "isError": false
}

Tip

It's usually a lot faster to run the inspector in CLI mode than in the browser. Read more about the inspector here.