I know "väl" has the meaning of "well", for example in "well known"/"välkänd". But I've seen it quite many times with no apparent meaning. Is it one of those "magic meaning" words in Swedish, like "ju"? What can it mean in different contexts? Tack så mycket
If it carries the meaning you mention, as an adverb of "good", it has a long Ä-sound.
But if used otherwise, the Ä-sound is short and the word is used to bring an aspect of uncertainty to what you're saying, and/or to kind of ask for confirmation of something.
Du är väl här i morgon? = You're here tomorrow, aren't you?
Tack så mycket, another case of those tricky short/long vowels :)
For what I've understood from explanations and context, it's a very subtle way to express something that is either obvious or should be known by both speakers in a conversation.