THe question regarding a 'tool' is rather vague. There are 17 definitions for tool on dictionary.com. It's upto the memb rto decide which one to go with:
tool      [tool] Pronunciation Key, 
–noun 1.	an implement, esp. one held in the hand, as a hammer, saw, or file, for performing or facilitating mechanical operations. 
2.	any instrument of manual operation. 
3.	the cutting or machining part of a lathe, planer, drill, or similar machine. 
4.	the machine itself; a machine tool. 
5.	anything used as a means of accomplishing a task or purpose: Education is a tool for success. 
6.	a person manipulated by another for the latter's own ends; cat's-paw. 
7.	the design or ornament impressed upon the cover of a book. 
8.	Underworld Slang. 	a.	a pistol or gun. 
b.	a pickpocket. 
9.	Slang: Vulgar. penis. 
–verb (used with object) 10.	to work or shape with a tool. 
11.	to work decoratively with a hand tool. 
12.	to ornament (the cover of a book) with a bookbinder's tool. 
13.	to drive (a vehicle): He tooled the car along the treacherous path. 
14.	to equip with tools or machinery. 
–verb (used without object) 15.	to work with a tool. 
16.	to drive or ride in a vehicle: tooling along the freeway. 
—Verb phrase17.	tool up, to install machinery designed for performing a particular job: manufacturers tooling up for production.
So all the 'tools' I saw on the first page are correct and meet the requirements of the question.
