I think this will be obsolete pretty soon when the equivalent is built-in to notmuch, but in the mean time, here is a script that somebody might find useful: retag a whole directory (recursively). I don't claim it is nice in any way, but it seems usable for me, taking about 5 seconds to retag a directory containing 1000 messages.
I use it like tagdir Maildir/.list.debian-devel -inbox +debian +devel
tagdir
Description: Binary data
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