Developer documentation is widely dispersed. While difficult, it is possible to become proficient finding User docs in the wiki, mail List and forum. But the developer docs tend to be more elusive.
For example, I note that the Gramps Data Model and API Methods are key references. But it usually takes me awhile to remember that the documentation tool used for the API is Sphinx then at least another 10 minutes to actually find those docs.
Meanwhile, the GitHub repository’s link for Documentation is for basic User docs, not developer docs (or docs for beta testers or translators). Nor does it link to the Developers category in the wiki.
The Documentation section of the README.md file of the Gramps-Project on GitHub:
But in this posting, he has an interesting note about calling Sphinx with Python with a Django example. Of course, the Bitbucket material is part of the archive, and not indexed on the Wayback Machine.
If some example of doing that could be found, it seems likely that the Help feature from @kku 's SuperTool might be expanded from merely being a APIl methods vocabulary list into being a real reference.