It would be nice to be able to search across known popular MediaWiki client libraries beyond pywikibot to help maintainers reason about the impact of MediaWiki API changes.
One example use case: search for usage of the writeapi right proposed for removal by T294397: Drop writeapi MediaWiki right. Removal of this right in 1.43.0-wmf.17 resulted in T371977: Removal of writeapi from siteinfo output breaks all mwclient-based bots, including stashbot (Server Admin Log) which likely would have been noticed if a global code search included https://github.com/mwclient/mwclient