I've done similar at my job where management wants us to use all of our tokens before they expire. I usually set it to documentation tasks and other minor tasks just to eat up tokens.
At least that nominally creates some value at the end of the day. Documentation is the thing everyone wants but no one has time/desire to create. My most recent token heavy task was having an agent write unit tests for coverage on a little graphAPI tool I'd written a bit ago to satisfy SonarQube.
There's really no end to dot-language diagrams you can have it make. Call graphs, package dependency maps, let it try to figure out an architecture diagram, whatever.