What is the origin of the idiom "the sharpest tool in the shed" and when to use it?

The specific origin of the idiom "the sharpest tool in the shed" is unclear, but it likely emerged as a humorous twist on the idea of tools in a shed or toolbox. The phrase is a form of wordplay that suggests that the person being referred to is not the brightest or most capable individual. It is often used in a mocking or derogatory manner, implying that the person is not the brightest or most capable individual.