InterModComms.sendTo("craftingtweaks","RegisterProvider",()->{
        CompoundNBT tagCompound=new CompoundNBT();
        tagCompound.putString("ContainerClass",YourCraftingContainer.class.getName());

        // tagCompound.putInteger("ValidContainerPredicate", YourContainerPredicate.class.getName());
        // tagCompound.putInteger("GetGridStartFunction", YourGridStartFunction.class.getName());

        // tagCompound.putInteger("GridSlotNumber", 1);
        // tagCompound.putInteger("GridSize", 9);
        // tagCompound.putBoolean("HideButtons", false);
        // tagCompound.putBoolean("PhantomItems", false);

        // tagCompound.putInteger("ButtonOffsetX", -16); // ignored if AlignToGrid is set
        // tagCompound.putInteger("ButtonOffsetY", 16); // ignored if AlignToGrid is set
        // ***** OR *****
        // tagCompound.putString("AlignToGrid", "left");

        // CompoundNBT tweakRotate = new CompoundNBT();
        // tweakRotate.putBoolean("Enabled", true);
        // tweakRotate.putBoolean("ShowButton", true);
        // tweakRotate.putInteger("ButtonX", 0); // ignored if AlignToGrid is set
        // tweakRotate.putInteger("ButtonY", 18); // ignored if AlignToGrid is set
        // tagCompound.put("TweakRotate", tweakRotate);
        // [...] (same structure for "TweakBalance" and "TweakClear")

        return tagCompound;
        });

import net.blay09.mods.craftingtweaks.api.*;
import net.minecraft.resources.ResourceLocation;
import net.minecraft.world.inventory.AbstractContainerMenu;

public class YourCustomCraftingGridProvider implements CraftingGridProvider {

    public YourCustomCraftingGridProvider() {
        CraftingTweaksAPI.registerCraftingGridProvider(this);
    }

    @Override
    public String getModId() {
        return "yourModId";
    }

    @Override
    public boolean requiresServerSide() {
        return false; // should be true if you use things such as phantom items, where simulating clicks would now result in desired behaviour
    }

    @Override
    public boolean handles(AbstractContainerMenu menu) {
        return menu instanceof YourCustomCraftingMenu; // buildCraftingGrids will only be called if this returns true for the given menu
    }

    @Override
    public void buildCraftingGrids(CraftingGridBuilder builder, AbstractContainerMenu menu) {
        // this is where you define crafting grids
        if (menu instanceof YourCustomCraftingMenu) {
            builder.addGrid(1, 9); // you can register a simple default grid like this

            builder.addGrid("secondary_grid",
                    1,
                    9); // you can also specify names (default: "default") if you have multiple grids in one screen

            builder.addGrid(1, 9) // you can also configure the default grid further
                    .disableTweak(TweakType.Rotate) // e.g. by disabling certain tweaks
                    .disableAllTweaks() // or by disabling all tweaks, if you hate Crafting Tweaks
                    .hideTweakButton(TweakType.Clear) // or by hiding a certain tweak button 
                    .hideAllTweakButtons() // or by hiding all tweak buttons
                    .usePhantomItems() // or by marking this grid to contain phantom items, which ensures that Crafting Tweaks doesn't perceive these items as real items
                    .setButtonAlignment(ButtonAlignment.TOP) // or by changing the alignment of the buttons, e.g. having them be at the top of the grid instead of at the left
                    .setButtonPosition(TweakType.Balance,
                            10,
                            10) // or by overriding the position of the buttons directly, ignoring alignment
                    .rotateHandler(/*...*/) // or by overriding the rotation handling
                    .balanceHandler(/*...*/) // or by overriding the balance handling
                    .clearHandler(/*...*/) // or by overriding the clear handling
                    .transferHandler(/*...*/); // or by overriding the transfer handling

            builder.addCustomGrid(new CraftingGrid() { // you can also add completely custom crafting grids with your own implementations
                // ...
            });
        }
    }
}

public class YourMod {
    private void setup() {
        // ...
        if (isModLoaded("craftingtweaks")) { // different calls depending on whether you use Forge or Fabric
            try {
                Class.forName("your.mod.compat.craftingtweaks.YourCustomCraftingGridProvider")
                        .getConstructor()
                        .newInstance();
            } catch (Throwable e) {
                e.printStackTrace();
            }
        }
        // ...
    }
}

import net.blay09.mods.craftingtweaks.api.CraftingGrid;
import net.blay09.mods.craftingtweaks.api.CraftingTweaksAPI;
import net.blay09.mods.craftingtweaks.api.CraftingTweaksClientAPI;
import net.blay09.mods.craftingtweaks.api.GridGuiHandler;
import net.blay09.mods.craftingtweaks.client.CraftingTweaksClient;
import net.minecraft.client.gui.components.AbstractWidget;
import net.minecraft.client.gui.screens.inventory.AbstractContainerScreen;

import java.util.function.Consumer;

public class YourCustomGridGuiHandler implements GridGuiHandler {
    public YourCustomGridGuiHandler() {
        CraftingTweaksClientAPI.registerCraftingGridGuiHandler(this);
    }

    @Override
    public void createButtons(AbstractContainerScreen<?> screen, CraftingGrid grid, Consumer<AbstractWidget> addWidgetFunc) {
        // CraftingTweaksClientAPI.createTweakButton(/* ... */); ...
    }
}