<!DOCTYPE html>
<html>
<head>
    <title>OK</title>
</head>
<body>
    <script>
    async function echo(obj) {
      return obj.text;
    }

    document.modelContext.registerTool({
      execute: echo,
      name: "echo",
      description: "echo input",
      inputSchema: {
          type: "object",
          properties: {
              "text": {
                  description: "Value to echo",
                  type: "string",
              }
          },
          required: ["text"]
      },
      annotations: {
        readOnlyHint: "true"
      },
    });
  </script>
</body>
</html>