For a farm implement, it is important to keep in mind that a crow is limited to using such tools by holding it with their beak or foot.  When you consider what a crow has been observed naturally doing on their own, a crow could potentially use a tiny rake to reach into tight spaces to take out an object, a tiny broom to brush away debris, or a tiny weight to displace fluid in a container.  Ultimately, their beak is their best tool to accomplish most things a human would employ them to do such as picking up tiny bits of trash and disposing it for a reward or potentially making holes in the ground to plant seeds (assuming they won't confuse the seeds as something they can eat).
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