A tool helps you make specialized ability checks,
craft certain items, or both. A tool’s description
includes the tool’s cost and weight, as well as the
following entries:

Ability. For each tool, you would add the listed ability's modifier and your proficiency bonus (if you're proficient in the tool) for any check made when using the tool.

Utilize. This entry lists things you can do with the tool when you take the Utilize action. You can do one of those things each time you take the action. This entry also provides the DC for the action. When you take this action, you can't do it again for that tool until you finish a short or long rest.

Craft. This entry lists what, if anything, you can craft with the tool. For crafting rules, see “Crafting Equipment” later in the chapter.

Variants. This entry appears if the tool has variants, which are listed. Each requires a separate proficiency.

Tool Proficiency

If you have proficiency with a tool, add your Proficiency Bonus to any ability check you make that uses the tool. If you have proficiency in a skill that's used with that check, you have Advantage on the check too.

Your features might give you proficiency with a tool. A monster has proficiency with any tool in its stat block.

Descriptions