tool_save_2.1.jar is a release file of the Minecraft mod Tool Save (Discontinued) for Forge, made for Minecraft 1.16.5. It was published on August 10, 2021 and is 0 MB in size. For the full description, screenshots and every other version, visit the Tool Save (Discontinued) mod page.
How to install: Put the .jar into the mods folder (.minecraft/mods) and start Minecraft with the matching mod loader profile.