This skill just tells current changes of major stock market indexes, e.g., up, down, up and down.
It may also be invoked from a routine. In this case, the market state can be automatically announced, for example, in the morning when you am going to the kitchen to have a cap of coffee. However, I am not able to test this functionality until the skill will be published.
The skill collects the market information from public Internet sources and this information may or may not be accurate or up-to-date. Do not rely on this data for your business.
The communication with the skill is simple: The skill tells the market state in one sentence and asks the user about details. The user can say Yes, Sure, Market Details, etc., to see changes of major indexes. Or, the user can say No, Later, Not Today, Thanks, Stop, etc., to end the session.
Since retrieval of the data may take some time, the skill may says a short phrase at the beginning of the session. The user can enable it by saying "Say hi", "Say hello", etc., or "Say nothing" to disabled a start phrase.