I’d love to be able to add a description to a section via the API. I know that it is currently not supported, but I’m wondering whether there’s an ETA for this, or maybe even some kind of obscure workaround?
Are you talking about a section in a board or a section in a list? 
You can update the section’s notes as a normal task update.
If the section is in a board you will not able to see the description in Asana UI. In List view everything will worked as you want.
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In a list
Then a section is a task with “:” at the end of the title, nothing else 
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Oh, wow, that makes everything a lot easier - thank you!
So I should be able to modify sections using the task endpoint?
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Positive 
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