OpenAPI Client

The dotnet CLI tool requires .NET SDK. The Docker image requires only Docker and has no local .NET dependency.

Install the OpenApiClient.Cli tool globally so it is available as a dotnet tool command.

dotnet tool install --global OpenApiClient.Cli

Add the server to your MCP client configuration file using the dotnet openapi command.

{
  "mcpServers": {
    "openapi": {
      "command": "dotnet",
      "args": ["openapi", "mcp"]
    }
  }
}

Alternatively, use the Docker image — no .NET installation required. The MODE environment variable selects stdio (default) or HTTP transport.

{
  "mcpServers": {
    "openapi": {
      "command": "docker",
      "args": ["run", "-i", "--rm", "mcp/openapi"]
    }
  }
}

Restart your client. The server exposes five tools: get_list_of_operations, get_known_responses, validate_document, generate_curl_command, and create_csharp_snippet. Point any tool at an OpenAPI JSON URL or local file path.

Add the NuGet source generator package to automatically generate typed HTTP clients from an OpenAPI spec at build time.

dotnet add package OpenApiClient