diff --git a/e2e/playwright/snapshot-tests.spec.ts-snapshots/Sketch-on-face-with-none-z-up-1-Google-Chrome-linux.png b/e2e/playwright/snapshot-tests.spec.ts-snapshots/Sketch-on-face-with-none-z-up-1-Google-Chrome-linux.png
index 8f2d5ce6a..2f01830a1 100644
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diff --git a/e2e/playwright/snapshot-tests.spec.ts-snapshots/Zoom-to-fit-on-load---solid-3d-1-Google-Chrome-linux.png b/e2e/playwright/snapshot-tests.spec.ts-snapshots/Zoom-to-fit-on-load---solid-3d-1-Google-Chrome-linux.png
index 4b2e73e9e..7aab43f25 100644
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diff --git a/e2e/playwright/snapshot-tests.spec.ts-snapshots/code-color-goober-code-color-goober-1-Google-Chrome-linux.png b/e2e/playwright/snapshot-tests.spec.ts-snapshots/code-color-goober-code-color-goober-1-Google-Chrome-linux.png
index 46d197e28..528af4463 100644
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diff --git a/e2e/playwright/snapshot-tests.spec.ts-snapshots/code-color-goober-code-color-goober-opening-window-1-Google-Chrome-linux.png b/e2e/playwright/snapshot-tests.spec.ts-snapshots/code-color-goober-code-color-goober-opening-window-1-Google-Chrome-linux.png
index 3e85c12d6..005013867 100644
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diff --git a/packages/codemirror-lang-kcl/src/kcl.grammar b/packages/codemirror-lang-kcl/src/kcl.grammar
index d8d9419b1..20400f5bb 100644
--- a/packages/codemirror-lang-kcl/src/kcl.grammar
+++ b/packages/codemirror-lang-kcl/src/kcl.grammar
@@ -59,7 +59,9 @@ UnaryOp { AddOp | BangOp }
 
 ObjectProperty { PropertyName (":" | Equals) expression }
 
-ArgumentList { "(" commaSep<expression> ")" }
+LabeledArgument { ArgumentLabel Equals expression }
+
+ArgumentList { "(" commaSep<LabeledArgument | expression> ")" }
 
 type[@isGroup=Type] {
   @specialize[@name=PrimitiveType]<
@@ -74,6 +76,8 @@ VariableDefinition { identifier }
 
 VariableName { identifier }
 
+ArgumentLabel { identifier }
+
 @skip { whitespace | LineComment | BlockComment }
 
 kw<term> { @specialize[@name={term}]<identifier, term> }
diff --git a/packages/codemirror-lang-kcl/test/call.txt b/packages/codemirror-lang-kcl/test/call.txt
new file mode 100644
index 000000000..ef3beb4e6
--- /dev/null
+++ b/packages/codemirror-lang-kcl/test/call.txt
@@ -0,0 +1,85 @@
+# empty
+
+f()
+
+==>
+Program(ExpressionStatement(CallExpression(VariableName,
+                                           ArgumentList)))
+
+# single anon arg
+
+f(1)
+
+==>
+Program(ExpressionStatement(CallExpression(VariableName,
+                                           ArgumentList(Number))))
+
+# deprecated multiple anon args
+
+f(1, 2)
+
+==>
+Program(ExpressionStatement(CallExpression(VariableName,
+                                           ArgumentList(Number,
+                                                        Number))))
+
+# deprecated trailing %
+
+startSketchOn('XY')
+|> line([thickness, 0], %)
+
+==>
+Program(ExpressionStatement(PipeExpression(CallExpression(VariableName,
+                                                          ArgumentList(String)),
+                                           PipeOperator,
+                                           CallExpression(VariableName,
+                                                          ArgumentList(ArrayExpression(VariableName,
+                                                                                       Number),
+                                                                       PipeSubstitution)))))
+
+# % and named arg
+
+startSketchOn('XY')
+|> line(%, end = [thickness, 0])
+
+==>
+Program(ExpressionStatement(PipeExpression(CallExpression(VariableName,
+                                                          ArgumentList(String)),
+                                           PipeOperator,
+                                           CallExpression(VariableName,
+                                                          ArgumentList(PipeSubstitution,
+                                                                       LabeledArgument(ArgumentLabel,
+                                                                                       Equals,
+                                                                                       ArrayExpression(VariableName,
+                                                                                                     Number)))))))
+
+# implied % and named arg
+
+startSketchOn('XY')
+|> line(end = [thickness, 0])
+
+==>
+Program(ExpressionStatement(PipeExpression(CallExpression(VariableName,
+                                                          ArgumentList(String)),
+                                           PipeOperator,
+                                           CallExpression(VariableName,
+                                                          ArgumentList(LabeledArgument(ArgumentLabel,
+                                                                                       Equals,
+                                                                                       ArrayExpression(VariableName,
+                                                                                                     Number)))))))
+
+# multiple named arg
+
+ngon(plane = "XY", numSides = 5, radius = pentR)
+
+==>
+Program(ExpressionStatement(CallExpression(VariableName,
+                                           ArgumentList(LabeledArgument(ArgumentLabel,
+                                                                        Equals,
+                                                                        String),
+                                                        LabeledArgument(ArgumentLabel,
+                                                                        Equals,
+                                                                        Number),
+                                                        LabeledArgument(ArgumentLabel,
+                                                                        Equals,
+                                                                        VariableName)))))