At the moment the number of tags allowed on a question is 5. Both client side and server side this limit is now1 enforced at the time of posting.
There is no direct limitation to allow 6 or even 7 tags. As a matter of fact, this query shows 1038 questions at the time of posting that have 6 tags. The revision for one occurrence reveals what caused that 6th ...
Nope, that's the URL to the documentation, not the API endpoint itself. The correct one is
and you can find it by clicking on the link in the Try It widget:
While this isn't possible with the API, it is possible with SEDE, if you allow for up to 7 days of lag.
Here is the SEDE Query that lists Tag wiki and excerpts in descending edit date order:
when w.lasteditdate > e.lasteditdate
There's unofficial collaborative Chat API Documentation for how everything in chat works.
Its split up into a couple different parts:
Receiving Events (Messages + other stuff)
More information here: Stack Exchange Chat API Documentation and Bot Boilerplate (finally)
Note: I started the ...