diff --git a/services/web/frontend/js/features/source-editor/hooks/use-command-definitions.ts b/services/web/frontend/js/features/source-editor/hooks/use-command-definitions.ts
index f43715af60..1d436a2efe 100644
--- a/services/web/frontend/js/features/source-editor/hooks/use-command-definitions.ts
+++ b/services/web/frontend/js/features/source-editor/hooks/use-command-definitions.ts
@@ -1,11 +1,9 @@
 import { useEffect, useState } from 'react'
-import { EditorState } from '@codemirror/state'
-import { SyntaxNode } from '@lezer/common'
-import { syntaxTree } from '@codemirror/language'
 import { useProjectContext } from '@/shared/context/project-context'
 import { debugConsole } from '@/utils/debugging'
 import { CommandDefinition } from '../utils/command-definitions/command-definition'
 import { getCommandDefinitionIndexer } from '../utils/command-definitions/command-definition-indexer'
+import { commandNameAtPos } from '../utils/command-definitions/command-name-at-pos'
 import { useCodeMirrorStateContext } from '../components/codemirror-context'
 import { contextMenuStateField } from '../extensions/context-menu'
 
@@ -71,24 +69,3 @@ export function useContextMenuCommandDefinition() {
   const commandDefinition = useCommandDefinition(commandName, tooltip)
   return { commandName, commandDefinition }
 }
-
-/**
- * Resolve the control sequence (e.g. `\mycmd`) at a document position, or null
- * if the position is not on a command. Walks up from the innermost node to the
- * nearest node carrying a control-sequence token, mirroring the command-usage
- * logic in tree-operations/commands.ts.
- */
-function commandNameAtPos(state: EditorState, pos: number): string | null {
-  const tree = syntaxTree(state)
-  // Bias right (as resolveCommandNode does) so a click on the command's first
-  // character resolves into it rather than the preceding token.
-  let node: SyntaxNode | null = tree.resolveInner(pos, 1)
-  for (; node; node = node.parent) {
-    const ctrlSeq = node.getChild('$CtrlSeq')
-    if (ctrlSeq && !ctrlSeq.type.is('$CtrlSym')) {
-      const name = state.sliceDoc(ctrlSeq.from, ctrlSeq.to)
-      return name.length > 0 ? name : null
-    }
-  }
-  return null
-}
diff --git a/services/web/frontend/js/features/source-editor/utils/command-definitions/command-name-at-pos.ts b/services/web/frontend/js/features/source-editor/utils/command-definitions/command-name-at-pos.ts
new file mode 100644
index 0000000000..8be91a7273
--- /dev/null
+++ b/services/web/frontend/js/features/source-editor/utils/command-definitions/command-name-at-pos.ts
@@ -0,0 +1,28 @@
+import { EditorState } from '@codemirror/state'
+import { SyntaxNode } from '@lezer/common'
+import { syntaxTree } from '@codemirror/language'
+
+/**
+ * Resolve the control sequence (e.g. `\mycmd`) at a document position, or null
+ * if the position is not on a command. Walks up from the innermost node to the
+ * nearest control-sequence node, mirroring the command-usage
+ * logic in tree-operations/commands.ts. Control symbols (e.g. `\\`, `\%`) are
+ * excluded: they are also in the `$CtrlSeq` group, but are never user-defined
+ * commands.
+ */
+export function commandNameAtPos(
+  state: EditorState,
+  pos: number
+): string | null {
+  const tree = syntaxTree(state)
+  // Bias right (as resolveCommandNode does) so a click on the command's first
+  // character resolves into it rather than the preceding token.
+  let node: SyntaxNode | null = tree.resolveInner(pos, 1)
+  for (; node; node = node.parent) {
+    if (node.type.is('$CtrlSeq') && !node.type.is('$CtrlSym')) {
+      const name = state.sliceDoc(node.from, node.to)
+      return name.length > 0 ? name : null
+    }
+  }
+  return null
+}
diff --git a/services/web/test/frontend/features/source-editor/utils/command-definitions/command-name-at-pos.test.ts b/services/web/test/frontend/features/source-editor/utils/command-definitions/command-name-at-pos.test.ts
new file mode 100644
index 0000000000..b4c3e611fc
--- /dev/null
+++ b/services/web/test/frontend/features/source-editor/utils/command-definitions/command-name-at-pos.test.ts
@@ -0,0 +1,47 @@
+import { LanguageSupport } from '@codemirror/language'
+import { EditorState } from '@codemirror/state'
+import { expect } from 'chai'
+import { commandNameAtPos } from '@/features/source-editor/utils/command-definitions/command-name-at-pos'
+import { LaTeXLanguage } from '@/features/source-editor/languages/latex/latex-language'
+
+const latex = new LanguageSupport(LaTeXLanguage)
+
+const makeState = (doc: string): EditorState =>
+  EditorState.create({ doc, extensions: [latex] })
+
+describe('commandNameAtPos', function () {
+  it('resolves the command name when the position is on the command', function () {
+    const doc = 'before \\mycmd{arg} after'
+    const state = makeState(doc)
+    const from = doc.indexOf('\\mycmd')
+    expect(commandNameAtPos(state, from)).to.equal('\\mycmd')
+    expect(commandNameAtPos(state, from + 3)).to.equal('\\mycmd')
+  })
+
+  it('resolves a known command name', function () {
+    const doc = 'some \\textbf{bold} text'
+    const state = makeState(doc)
+    expect(commandNameAtPos(state, doc.indexOf('\\textbf'))).to.equal(
+      '\\textbf'
+    )
+  })
+
+  it('returns null for a control symbol', function () {
+    const doc = 'linebreak \\\\ and \\% percent'
+    const state = makeState(doc)
+    expect(commandNameAtPos(state, doc.indexOf('\\\\'))).to.equal(null)
+    expect(commandNameAtPos(state, doc.indexOf('\\%'))).to.equal(null)
+  })
+
+  it('returns null on plain text', function () {
+    const doc = 'plain text \\mycmd{arg}'
+    const state = makeState(doc)
+    expect(commandNameAtPos(state, 0)).to.equal(null)
+  })
+
+  it("returns null inside a command's argument", function () {
+    const doc = '\\mycmd{argument}'
+    const state = makeState(doc)
+    expect(commandNameAtPos(state, doc.indexOf('argument') + 3)).to.equal(null)
+  })
+})