diff --git a/src/webgpu/listing_meta.json b/src/webgpu/listing_meta.json
index cd81244e41e0..fad278b7753c 100644
--- a/src/webgpu/listing_meta.json
+++ b/src/webgpu/listing_meta.json
@@ -1861,7 +1861,7 @@
   "webgpu:shader,validation,expression,call,builtin,ceil:integer_argument:*": { "subcaseMS": 1.456 },
   "webgpu:shader,validation,expression,call,builtin,ceil:values:*": { "subcaseMS": 1.539 },
   "webgpu:shader,validation,expression,call,builtin,clamp:values:*": { "subcaseMS": 0.377 },
-  "webgpu:shader,validation,expression,call,builtin,cos:bad_args:*": { "subcaseMS": 2.868 },
+  "webgpu:shader,validation,expression,call,builtin,cos:args:*": { "subcaseMS": 4.445 },
   "webgpu:shader,validation,expression,call,builtin,cos:integer_argument:*": { "subcaseMS": 1.601 },
   "webgpu:shader,validation,expression,call,builtin,cos:must_use:*": { "subcaseMS": 0.526 },
   "webgpu:shader,validation,expression,call,builtin,cos:values:*": { "subcaseMS": 0.338 },
@@ -1924,7 +1924,7 @@
   "webgpu:shader,validation,expression,call,builtin,saturate:values:*": { "subcaseMS": 0.317 },
   "webgpu:shader,validation,expression,call,builtin,sign:unsigned_integer_argument:*": { "subcaseMS": 1.120 },
   "webgpu:shader,validation,expression,call,builtin,sign:values:*": { "subcaseMS": 0.343 },
-  "webgpu:shader,validation,expression,call,builtin,sin:bad_args:*": { "subcaseMS": 3.338 },
+  "webgpu:shader,validation,expression,call,builtin,sin:args:*": { "subcaseMS": 4.443 },
   "webgpu:shader,validation,expression,call,builtin,sin:integer_argument:*": { "subcaseMS": 1.189 },
   "webgpu:shader,validation,expression,call,builtin,sin:must_use:*": { "subcaseMS": 0.588 },
   "webgpu:shader,validation,expression,call,builtin,sin:values:*": { "subcaseMS": 0.349 },
diff --git a/src/webgpu/shader/validation/expression/call/builtin/cos.spec.ts b/src/webgpu/shader/validation/expression/call/builtin/cos.spec.ts
index 1cb618c3888b..361cb8ed9955 100644
--- a/src/webgpu/shader/validation/expression/call/builtin/cos.spec.ts
+++ b/src/webgpu/shader/validation/expression/call/builtin/cos.spec.ts
@@ -80,26 +80,29 @@ Validates that scalar and vector integer arguments are rejected by ${builtin}()
     );
   });
 
-const kGoodArgs = '(1.1)';
-const kBadArgs = {
-  no_parens: '',
+const kArgCases = {
+  good: '(1.1)',
+  bad_no_parens: '',
   // Bad number of args
-  '0args': '()',
-  '2args': '(1.0,2.0)',
-  // Bad value for arg 0
-  '0i32': '(1i)',
-  '0u32': '(1u)',
-  '0bool': '(false)',
-  '0vec2u': '(vec2u())',
-  '0array': '(array(1.1,2.2))',
-  '0struct': '(modf(2.2))',
+  bad_0args: '()',
+  bad_2args: '(1.0,2.0)',
+  // Bad value type for arg 0
+  bad_0i32: '(1i)',
+  bad_0u32: '(1u)',
+  bad_0bool: '(false)',
+  bad_0vec2u: '(vec2u())',
+  bad_0array: '(array(1.1,2.2))',
+  bad_0struct: '(modf(2.2))',
 };
 
-g.test('bad_args')
-  .desc(`Test compilation failure of ${builtin} with bad arguments`)
-  .params(u => u.combine('arg', keysOf(kBadArgs)))
+g.test('args')
+  .desc(`Test compilation failure of ${builtin} with variously shaped and typed arguments`)
+  .params(u => u.combine('arg', keysOf(kArgCases)))
   .fn(t => {
-    t.expectCompileResult(false, `const c = ${builtin}${kBadArgs[t.params.arg]};`);
+    t.expectCompileResult(
+      t.params.arg === 'good',
+      `const c = ${builtin}${kArgCases[t.params.arg]};`
+    );
   });
 
 g.test('must_use')
@@ -107,5 +110,5 @@ g.test('must_use')
   .params(u => u.combine('use', [true, false]))
   .fn(t => {
     const use_it = t.params.use ? '_ = ' : '';
-    t.expectCompileResult(t.params.use, `fn f() { ${use_it}${builtin}${kGoodArgs}; }`);
+    t.expectCompileResult(t.params.use, `fn f() { ${use_it}${builtin}${kArgCases['good']}; }`);
   });
diff --git a/src/webgpu/shader/validation/expression/call/builtin/sin.spec.ts b/src/webgpu/shader/validation/expression/call/builtin/sin.spec.ts
index 7885d2e9141c..6be01123cc94 100644
--- a/src/webgpu/shader/validation/expression/call/builtin/sin.spec.ts
+++ b/src/webgpu/shader/validation/expression/call/builtin/sin.spec.ts
@@ -75,31 +75,35 @@ Validates that scalar and vector integer arguments are rejected by ${builtin}()
       t,
       builtin,
       /* expectedResult */ type === Type.f32,
+
       [type.create(0)],
       'constant'
     );
   });
 
-const kGoodArgs = '(1.1)';
-const kBadArgs = {
-  no_parens: '',
+const kArgCases = {
+  good: '(1.1)',
+  bad_no_parens: '',
   // Bad number of args
-  '0args': '()',
-  '2args': '(1.0,2.0)',
-  // Bad value for arg 0
-  '0i32': '(1i)',
-  '0u32': '(1u)',
-  '0bool': '(false)',
-  '0vec2u': '(vec2u())',
-  '0array': '(array(1.1,2.2))',
-  '0struct': '(modf(2.2))',
+  bad_0args: '()',
+  bad_2args: '(1.0,2.0)',
+  // Bad value type for arg 0
+  bad_0i32: '(1i)',
+  bad_0u32: '(1u)',
+  bad_0bool: '(false)',
+  bad_0vec2u: '(vec2u())',
+  bad_0array: '(array(1.1,2.2))',
+  bad_0struct: '(modf(2.2))',
 };
 
-g.test('bad_args')
-  .desc(`Test compilation failure of ${builtin} with bad arguments`)
-  .params(u => u.combine('arg', keysOf(kBadArgs)))
+g.test('args')
+  .desc(`Test compilation failure of ${builtin} with variously shaped and typed arguments`)
+  .params(u => u.combine('arg', keysOf(kArgCases)))
   .fn(t => {
-    t.expectCompileResult(false, `const c = ${builtin}${kBadArgs[t.params.arg]};`);
+    t.expectCompileResult(
+      t.params.arg === 'good',
+      `const c = ${builtin}${kArgCases[t.params.arg]};`
+    );
   });
 
 g.test('must_use')
@@ -107,5 +111,5 @@ g.test('must_use')
   .params(u => u.combine('use', [true, false]))
   .fn(t => {
     const use_it = t.params.use ? '_ = ' : '';
-    t.expectCompileResult(t.params.use, `fn f() { ${use_it}${builtin}${kGoodArgs}; }`);
+    t.expectCompileResult(t.params.use, `fn f() { ${use_it}${builtin}${kArgCases['good']}; }`);
   });