diff --git a/src/main/java/org/scijava/parsington/eval/AbstractEvaluator.java b/src/main/java/org/scijava/parsington/eval/AbstractEvaluator.java
index 82502ba..4be9e8e 100644
--- a/src/main/java/org/scijava/parsington/eval/AbstractEvaluator.java
+++ b/src/main/java/org/scijava/parsington/eval/AbstractEvaluator.java
@@ -30,7 +30,6 @@
 
 package org.scijava.parsington.eval;
 
-import java.util.Collections;
 import java.util.HashMap;
 import java.util.Map;
 
@@ -73,6 +72,11 @@ public void setStrict(final boolean strict) {
 		this.strict = strict;
 	}
 
+	@Override
+	public Map<String, Object> vars() {
+		return vars;
+	}
+
 	@Override
 	public Object get(final String name) {
 		// NB: Here, we look up the key twice: once with containsKey, then
@@ -89,29 +93,4 @@ public Object get(final String name) {
 		return new Unresolved(name);
 	}
 
-	@Override
-	public Map<String, Object> getAll() {
-		return Collections.unmodifiableMap(vars);
-	}
-
-	@Override
-	public void set(final String name, final Object value) {
-		vars.put(name, value);
-	}
-
-	@Override
-	public void setAll(final Map<? extends String, ? extends Object> map) {
-		vars.putAll(map);
-	}
-
-	@Override
-	public Object remove(final String name) {
-		return vars.remove(name);
-	}
-
-	@Override
-	public void clear() {
-		vars.clear();
-	}
-
 }
diff --git a/src/main/java/org/scijava/parsington/eval/Evaluator.java b/src/main/java/org/scijava/parsington/eval/Evaluator.java
index 1be84d2..9395dd5 100644
--- a/src/main/java/org/scijava/parsington/eval/Evaluator.java
+++ b/src/main/java/org/scijava/parsington/eval/Evaluator.java
@@ -112,6 +112,17 @@ public interface Evaluator {
 	 */
 	Object evaluate(SyntaxTree syntaxTree);
 
+	/**
+	 * Gets all variables as a mutable {@link Map}. Not thread-safe.
+	 * <p>
+	 * This map is a view, not a copy&mdash;i.e., changes to this map alter the
+	 * evaluator's actual variable values.
+	 * </p>
+	 *
+	 * @return The map from variable names to variable values.
+	 */
+	Map<String, Object> vars();
+
 	/**
 	 * Gets the value of a token. For variables, returns the value of the
 	 * variable, throwing an exception if the variable is not set. For literals,
@@ -153,7 +164,9 @@ default Variable var(final Object token) {
 	 * @param name The name of the variable whose value you want to set.
 	 * @param value The value to assign to the variable.
 	 */
-	void set(String name, Object value);
+	default void set(String name, Object value) {
+		vars().put(name, value);
+	}
 
 	/**
 	 * Gets the value of a variable.
@@ -167,13 +180,6 @@ default Object get(final Variable v) {
 		return get(v.getToken());
 	}
 
-	/**
-	 * Gets a map of all variable names and values.
-	 *
-	 * @return A map from variable names to variable values.
-	 */
-	Map<String, Object> getAll();
-
 	/**
 	 * Sets the value of a variable.
 	 * 
@@ -189,7 +195,9 @@ default void set(final Variable v, final Object value) {
 	 * 
 	 * @param map A map from variable names to variable values.
 	 */
-	void setAll(Map<? extends String, ? extends Object> map);
+	default void setAll(Map<? extends String, ? extends Object> map) {
+		vars().putAll(map);
+	}
 
 	/**
 	 * Removes the named variable.
@@ -198,12 +206,15 @@ default void set(final Variable v, final Object value) {
 	 * @return The previous variables value associated with name,
 	 *         or null if the name did not exist.
 	 */
-	Object remove(String name);
+	default Object remove(String name) {
+		return vars().remove(name);
+	}
 
 	/**
 	 * Clears all the variables.
-	 *
 	 */
-	void clear();
+	default void clear() {
+		vars().clear();
+	}
 
 }
diff --git a/src/test/java/org/scijava/parsington/eval/AbstractEvaluatorTest.java b/src/test/java/org/scijava/parsington/eval/AbstractEvaluatorTest.java
index 62d5fc9..5b66364 100644
--- a/src/test/java/org/scijava/parsington/eval/AbstractEvaluatorTest.java
+++ b/src/test/java/org/scijava/parsington/eval/AbstractEvaluatorTest.java
@@ -83,17 +83,18 @@ public void testClear() {
 		final Evaluator e = createEvaluator();
 		e.set("a", 1);
 		e.set("b", 2);
+		assertEquals(2, e.vars().size());
 		e.clear();
-		assertEquals(new HashMap<>(), e.getAll());
+		assertEquals(0, e.vars().size());
 		assertThrows(IllegalArgumentException.class, () -> e.get("a"));
 		assertThrows(IllegalArgumentException.class, () -> e.get("b"));
 	}
 
-	/** Tests {@link Evaluator#getAll()} and {@link Evaluator#setAll(Map)}. */
+	/** Tests {@link Evaluator#vars()} and {@link Evaluator#setAll(Map)}. */
 	@Test
-	public void testGetAllSetAll() {
+	public void testVarsSetAll() {
 		final Evaluator e = createEvaluator();
-		assertEquals(new HashMap<>(), e.getAll());
+		assertEquals(new HashMap<>(), e.vars());
 
 		final Map<String, Object> vars = new HashMap<>();
 		vars.put("a", 1);
@@ -101,7 +102,7 @@ public void testGetAllSetAll() {
 		vars.put("c", 3.0);
 		e.setAll(vars);
 
-		assertEquals(vars, e.getAll());
+		assertEquals(vars, e.vars());
 
 		// Verify individual get still works after setAll.
 		assertEquals(1, e.get("a"));
@@ -110,9 +111,9 @@ public void testGetAllSetAll() {
 
 		// Verify variables created at evaluation are accessible and correct.
 		e.evaluate("d=a+c");
-		assertTrue(e.getAll().containsKey("d"));
+		assertTrue(e.vars().containsKey("d"));
 		final Object dVal = e.get("d");
 		assertEquals(4.0, dVal);
-		assertEquals(dVal, e.getAll().get("d"));
+		assertEquals(dVal, e.vars().get("d"));
 	}
 }