diff --git a/src/components/sequencing/form/ArgEditor.svelte b/src/components/sequencing/form/ArgEditor.svelte
index a1f8ba6841..b1751890a4 100644
--- a/src/components/sequencing/form/ArgEditor.svelte
+++ b/src/components/sequencing/form/ArgEditor.svelte
@@ -82,7 +82,12 @@
   {:else}
     <ArgTitle {argDef} />
     {#if isVariable && isFswCommandArgumentEnum(argDef)}
-      <div class="st-typography-small-caps" title="Dictionary values must be quoted in editor">Global/Parameter</div>
+      <div
+        class="st-typography-small-caps"
+        title="Literals are quoted in editor, Constants/Parameters/Variables are unquoted"
+      >
+        Reference
+      </div>
       <EnumEditor
         {argDef}
         initVal={argInfo.text ?? ''}
diff --git a/src/utilities/codemirror/vml/vmlBlockLibrary.ts b/src/utilities/codemirror/vml/vmlBlockLibrary.ts
index bda41e72e2..fe60a16575 100644
--- a/src/utilities/codemirror/vml/vmlBlockLibrary.ts
+++ b/src/utilities/codemirror/vml/vmlBlockLibrary.ts
@@ -8,6 +8,7 @@ import type {
   HwCommand,
   NumericRange,
 } from '@nasa-jpl/aerie-ampcs';
+import { isDefined } from '../../sequence-editor/tree-utils';
 import { VmlLanguage } from './vml';
 import {
   RULE_BLOCK,
@@ -49,7 +50,7 @@ export function vmlBlockLibraryToCommandDictionary(vml: string, id?: string, pat
     ...(parsed.topNode.getChild(RULE_FUNCTIONS)?.getChildren(RULE_FUNCTION) ?? []).map(blockNode =>
       blockToCommandDef(blockNode, vml),
     ),
-  ].filter((maybeCommandDef): maybeCommandDef is FswCommand => !!maybeCommandDef);
+  ].filter(isDefined);
 
   const mission_name = '';
   const spacecraft_ids = [0];
@@ -84,7 +85,7 @@ function blockToCommandDef(functionNode: SyntaxNode, vml: string): FswCommand |
   const parameterNodes = commonFunctionNode?.getChild(RULE_PARAMETERS)?.getChildren(RULE_PARAMETER) ?? [];
   const fswArguments: FswCommandArgument[] = parameterNodes
     ?.map(parameterNode => inputToArgument(parameterNode, vml))
-    .filter((maybeArg): maybeArg is FswCommandArgument => !!maybeArg);
+    .filter(isDefined);
 
   if (stem) {
     return {
@@ -205,7 +206,7 @@ function parseRange(parameterNode: SyntaxNode | null, vml: string): null | strin
         }
         return null;
       })
-      .filter((maybeRangeValue): maybeRangeValue is number | string | NumericRange => !!maybeRangeValue);
+      .filter(isDefined);
 
     // mixed arrays aren't resolved due to undefined meaning
     if (rangeValues.every(rangeValue => typeof rangeValue === 'number')) {
diff --git a/src/utilities/codemirror/vml/vmlFormatter.ts b/src/utilities/codemirror/vml/vmlFormatter.ts
index a8d2f3855f..95ae50edaa 100644
--- a/src/utilities/codemirror/vml/vmlFormatter.ts
+++ b/src/utilities/codemirror/vml/vmlFormatter.ts
@@ -2,6 +2,7 @@ import { syntaxTree } from '@codemirror/language';
 import type { ChangeSpec, EditorState } from '@codemirror/state';
 import type { SyntaxNode } from '@lezer/common';
 import { EditorView } from 'codemirror';
+import { isDefined } from '../../sequence-editor/tree-utils';
 import {
   RULE_ASSIGNMENT,
   RULE_CALL_PARAMETERS,
@@ -142,7 +143,7 @@ export function vmlFormat(view: EditorView): void {
   const docText = state.toText(state.sliceDoc());
 
   const maybeChanges = linesToFormat.flatMap((line: LineOfNodes) => {
-    const firstNode = line.find(maybeNode => !!maybeNode);
+    const firstNode = line.find(isDefined);
     if (firstNode === undefined) {
       // unexpected case of no nodes on line
       return [];
@@ -150,7 +151,7 @@ export function vmlFormat(view: EditorView): void {
 
     const commandLine = docText.lineAt(firstNode.from);
 
-    const filteredArray: SyntaxNode[] = line.filter((maybeNode): maybeNode is SyntaxNode => !!maybeNode);
+    const filteredArray: SyntaxNode[] = line.filter(isDefined);
     const deletions: ChangeSpec[] = [];
 
     // remove indentation at start of line
@@ -209,10 +210,7 @@ export function vmlFormat(view: EditorView): void {
     return [...deletions, ...insertions];
   });
 
-  const changes = [
-    ...commandIndentChangeMap.values(),
-    ...maybeChanges.filter((maybeChange): maybeChange is ChangeSpec => !!maybeChange),
-  ];
+  const changes = [...commandIndentChangeMap.values(), ...maybeChanges.filter(isDefined)];
 
   // Consider delete end of line whitespace
   // Consider alignment of comments
diff --git a/src/utilities/codemirror/vml/vmlTreeUtils.ts b/src/utilities/codemirror/vml/vmlTreeUtils.ts
index 353db0f5b7..177c59a22c 100644
--- a/src/utilities/codemirror/vml/vmlTreeUtils.ts
+++ b/src/utilities/codemirror/vml/vmlTreeUtils.ts
@@ -1,5 +1,10 @@
 import type { SyntaxNode, Tree } from '@lezer/common';
-import { filterNodesToArray, getChildrenNode, getNearestAncestorNodeOfType } from '../../sequence-editor/tree-utils';
+import {
+  filterNodesToArray,
+  getChildrenNode,
+  getNearestAncestorNodeOfType,
+  isDefined,
+} from '../../sequence-editor/tree-utils';
 import type { CommandInfoMapper } from '../commandInfoMapper';
 import {
   RULE_CALL_PARAMETER,
@@ -123,10 +128,6 @@ export class VmlCommandInfoMapper implements CommandInfoMapper {
   }
 }
 
-function isDefined<Type>(maybeValue: Type | null | undefined): maybeValue is Type {
-  return maybeValue !== null && maybeValue !== undefined;
-}
-
 export function getArgumentPosition(argNode: SyntaxNode): number {
   return (
     getNearestAncestorNodeOfType(argNode, [RULE_STATEMENT])
diff --git a/src/utilities/sequence-editor/tree-utils.ts b/src/utilities/sequence-editor/tree-utils.ts
index 6f8b58c5f2..5ecd03611c 100644
--- a/src/utilities/sequence-editor/tree-utils.ts
+++ b/src/utilities/sequence-editor/tree-utils.ts
@@ -93,3 +93,7 @@ export function filterNodesToArray(cursor: TreeCursor, filter?: (node: SyntaxNod
 export function nodeContents(input: string, node: SyntaxNode): string {
   return input.substring(node.from, node.to);
 }
+
+export function isDefined<Type>(maybeValue: Type | null | undefined): maybeValue is Type {
+  return maybeValue !== null && maybeValue !== undefined;
+}