Wait -- why would you make a claim for $850 in tools with a $2500 deductible? The insurance wouldn't pay anything anyway, so why would you even consider this? All you'd accomplish would be to create a record of a claim, which (a) would jack your rates, and (b) could be used to deny coverage later if you have another claim or two. You would be shooting yourself in the foot and not even getting anything for the pain. I'm also not sure the tools are even covered, since they were the contractor's and not yours.
The flip side of having a high deductible is understanding that you are paying out of pocket for anything less than that.* If you're not prepared to do that, then it's time to lower the deductible.
*I also agree with others that you're probably not legally responsible for the tools, unless you opened the window after the contractor left, and so should evaluate this as a moral/relationship decision.