No modern Spiders have claws but there a number of spider kin that do. One of the best examples is the camel spider...it is not a true spider, just a close relative. See link. Their bite is painful but they are not particularly venomous.
the spider crab will eat any thing that it can get its claws on ;D
both
very harmful
Some animals are harmful like the lion, the tiger, or the wolf, because they can bite, slash with their claws, and other harmful things. But not all animals are harmful. Most of the harmful animals have claws, venom, or something dangerous.
digs into it with claws
yes
A Black Widow.
They have big teeth, claws and every so often attack and kill people. That is harmful.
A spider falling onto a person is harmless, so long as the spider is not venomous. A spider falling would likely be harmful to the spider.
Only if there adults
Spider mums or any chrysanthemums are toxic and harmful to pets and and small children.
Cats are very useful because they can kill bugs or mice living in your house but they are also harmful, they have sharp claws that can give you cuts. To prevent it the claws can be cut every few months.