Waila Harvestability
This client-side add-on for Waila or Hwyla provides detailed information about the harvestability of blocks you're looking at in the game.
Main Features
By default, the mod displays three types of information: whether the block can be harvested at the moment, the required tool level for efficient harvesting, and the type of tool that works best with this block. In Waila's settings, numerous configuration options are available to customize the display of exactly the information you need.
Mod Usage Examples
When using an iron pickaxe (default settings):

Silk Touch and shear functions:

Waila configuration screen:

Minimal mode:

Features
The mod is particularly useful when used together with Tinkers' Construct, but the provided information remains relevant even without this mod. Source code is available on Github along with a bug tracking system. The mod can be freely added to any modpack.
Requirements
- Waila or Hwyla
- Minecraft Forge
Additional Resources
For similar functionality in Fabric, the Can I Mine This Block? mod is recommended.