No. Why? Should've added this earlier.

CHANGELOG.md

@@ -1,6 +1,3 @@
 ### What's New:
 
-* Added entity parameter to `cmd:explode`. The entity will be marked as the "creator" of the explosion and other entities will redirect their anger to the entity if affected by the explosion.
-* Added fire parameter to `cmd:explode`. Creates fire, if true.
-* Fixed `double` casts converting numbers to scientific notation.
-* `long` and `int` casts no longer actually convert to their types, instead they truncate the trailing zeros.
+* Added `hasContext` function to expressions. Allows checking if loot context has the required parameter: `if(hasContext("tool"), "Hi", "Bye")`

gradle.properties

@@ -6,7 +6,7 @@ minecraft_version=1.20.1
 yarn_mappings=1.20.1+build.10
 loader_version=0.15.7
 # Mod Properties
-mod_version=0.3.0
+mod_version=0.3.1
 maven_group=me.melontini
 archives_base_name=commander
 # Dependencies

src/main/java/me/melontini/commander/impl/expression/EvalUtils.java

@@ -18,10 +18,7 @@
 import it.unimi.dsi.fastutil.objects.Object2ObjectOpenHashMap;
 import me.melontini.commander.api.expression.Arithmetica;
 import me.melontini.commander.impl.event.data.types.ExtractionTypes;
-import me.melontini.commander.impl.util.functions.ClampFunction;
-import me.melontini.commander.impl.util.functions.LerpFunction;
-import me.melontini.commander.impl.util.functions.RangedRandomFunction;
-import me.melontini.commander.impl.util.functions.StructContainsKeyFunction;
+import me.melontini.commander.impl.util.functions.*;
 import net.minecraft.loot.context.LootContext;
 import net.minecraft.util.Identifier;
 import org.jetbrains.annotations.Nullable;
@@ -68,6 +65,8 @@ public class EvalUtils {
                             .put("clamp", new ClampFunction())
                             //maps
                             .put("structContainsKey", new StructContainsKeyFunction())
+                            //meta
+                            .put("hasContext", new HasContextFunction())
                             // trigonometric
                             .put("acos", new AcosFunction())
                             .put("acosh", new AcosHFunction())

src/main/java/me/melontini/commander/impl/util/functions/HasContextFunction.java

@@ -0,0 +1,16 @@
+package me.melontini.commander.impl.util.functions;
+
+import com.ezylang.evalex.EvaluationException;
+import com.ezylang.evalex.Expression;
+import com.ezylang.evalex.data.EvaluationValue;
+import com.ezylang.evalex.functions.AbstractFunction;
+import com.ezylang.evalex.functions.FunctionParameter;
+import com.ezylang.evalex.parser.Token;
+
+@FunctionParameter(name = "key")
+public class HasContextFunction extends AbstractFunction {
+    @Override
+    public EvaluationValue evaluate(Expression expression, Token functionToken, EvaluationValue... par) throws EvaluationException {
+        return expression.convertValue(expression.getDataAccessor().getData(par[0].getStringValue()) != null);
+    }
+}