Toole was one of many nameless, mass produced homunculi created for the Greater Holy Grail War. She was selected as a commander for battles.
Toole has a "neat and lively personality." She is described, "using visual novel or light novel terminology", as being the "female teacher-type who has sex appeal, but is unfortunately coarse and ill-mannered."
Like the other homuculi, Toole has short ashen brown hair and red eyes. She wears a black button up shirt, a green tie, white jacket and a green skirt with tights. She also wears black shoes.
Toole survives through the end of the Great Holy Grail War. Due to Gordes' reformed personality, she takes charge of Gordes' son's education. She performs this duty through "thoroughly beating up" the son, and subsequently Gordes' wife after she protests the treatment of her son and Gordes himself. Winning supremacy over the family, she stands at the top of the hierarchy for three months until her death caused by her short lifespan.
In the world of Fate/Grand Order, the Musik family created homunculi as well, Toole being the tutor of Gordolf Musik when he was young. Goredolf mentions Toole IV (トゥールⅣ?), so the series of homunculus appears to have the same short lifespan as in the Apocrypha world. If Goredolf's comparison of her personality to Nightingale's is any indication, it is very likely that she has the same personality as her counterpart as well.
Toole is lacking in Magic Circuits, but she excels in fighting ability and her ability to inspire troops, leading to her being made a commander. She has a very short lifespan of two to three months due to the planning of only needing the homunculi for a short period of time.
 Fate/Apocrypha material - Encyclopedia: Tool [Person's name], p.176-177 [T]
Tool [Person's name]
One of the homunculi created by Gordes. Though her Magic Circuits are meager, she excels in fighting ability and inspiration, so she was selected as a commander. Just as told in the novels, battle-type homunculi have extremely short lifespans, with a limit of two to three months of life.
For a homunculus, she has a neat and lively personality. If we were describing her using visual novel or light novel terminology, then she would be the “female teacher-type who has sex appeal, but is unfortunately coarse and ill-mannered”.
At Gordes’ request, she has taken charge of thoroughly beating up his son. Naturally, his wife protested when their son was beat up, so Tool beat her up and beat up Gordes too while she was at it, winning supremacy over their family. It is said that, for three months, this homunculus stood at the top of the Musik family.
 Fate/Grand Order - Be Graceful
It is the responsibility of a gentleman to be generous.
- The photo is just an image.
“This photo doesn’t do me justice.
I’m actually more svelte, and Toole IV isn’t as modest in real life as seen in that photo.
Hm? What kind of maid is Toole IV, you ask?
Ah. You’ll have to excuse me for my lack of description, but you do know of Miss Nightingale, yes? Toole’s…not unlike her.”
- The photo is just an image.