flow

type Definition struct {
	Name  string `yaml:"name"`
	Steps []Step `yaml:"steps"`
}

type Runner struct {
	Invoke func(ctx context.Context, operationID string, params map[string]string, approvalID string) (string, string, error)
}

type Step struct {
	Operation string `yaml:"operation"`
	Output    string `yaml:"output"` // copied onto the next step's parameter To
	To        string `yaml:"to"`
}

type StoppedError struct {
	Status    string
	Operation string
}