body method
Defines the actual body code.
実際の本体コードを定義します。
Implementation
@override
DynamicMap body(ExecContext context) {
  final secretsGithub = context.secrets.getAsMap("github");
  final token = secretsGithub.get("token", "");
  return {
    "github": {
      "type": "http",
      "url": "https://api.githubcopilot.com/mcp",
      "headers": {"Authorization": "Bearer $token"}
    },
  };
}