I've lost some tools in the cave. My scythe and my watering can. I've looked through the forums and I've come to the "resolution" of using a save editor. I have to say, this is something that infuriates me. This should have been planned for. I'm not one to go blabbing on about some minor bug and how it ruined my life but this is a MAJOR issue. These items are essential to use the main mechanics of this game. Farming. Ideally, I'd like to see these items marked so you can't lose them, but I understand if the item codes are not particularly convenient for this. Alternatively, having a place to replace essential items without upgrades would be aggravating, but at least I could play the game.
http://community.playstarbound.com/threads/no-way-to-recover-lost-tools.106876/ If I recall right, I've read somewhere that You get them (without upgrades) trough mail next day.