"You" can be singular or plural, and the tools may be jointly or individually owned, depending on context. If you are using this sentence for real, be aware that the phrase "playing with one's tool" is rather unfortunate as it brings to mind a vulgar meaning of the word "tool".
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GPY"playing with one's tool" is rather unfortunate as it brings to mind a vulgar meaning of the word "tool".If "you" refers to a male or males.