// Logger is the interface for logging retry events.
// If not set, retry events are silently dropped.
type Logger interface {
    Printf(format string, args ...any)
}

// ModelRetryConfig configures retry behavior for the ChatModel node.
type ModelRetryConfig struct {
    MaxRetries  int
    IsRetryAble func(ctx context.Context, err error) bool
    BackoffFunc func(ctx context.Context, attempt int) time.Duration

    // Logger is used to log retry events.
    // If nil, retry events are silently dropped.
    Logger Logger
}