Is there a list of available filters, functions, obs metadata, and other options that can be used in YAML? What would happen, say, if they are not spelled correctly in the YAML files?

If they are not spelled correctly, it doesn’t tell you that something is spelled wrong - it will just crash. Name of the obs function dot H would be the best way to view that.

There is an ongoing effort to bring YAML verification into JEDI. The verification would check that all options are spelled correctly, there are no extra or erroneous entries, and output a user-friendly error message if something is wrong. Not all of the YAML entries in JEDI are currently verified, but some already are (most of them in the observations part of yaml).