Why this is worth an hour
Tool descriptions are the most-repeated text in an agent. Every one is sent on every request, on every iteration. Cutting sixty tokens across a dozen tools is seven hundred tokens off every single call, permanently.
It is also mechanical work with no quality risk, which makes it one of the few optimisations you can do without an evaluation cycle.
What gets removed
Preamble first: "this function is used to" tells the model something it already knows. Then the wordy constructions — "in order to", "is able to", "for the purpose of" — that survive from documentation habits.
The tool also flags descriptions that explain parameters in prose. The schema already declares them, and stating them twice costs tokens while creating a second place for them to drift out of date.