diff --git a/tests/boundary/filesystem/interfaceBuilderBundle.test.ts b/tests/boundary/filesystem/interfaceBuilderBundle.test.ts
index c30908794..4446c80dc 100644
--- a/tests/boundary/filesystem/interfaceBuilderBundle.test.ts
+++ b/tests/boundary/filesystem/interfaceBuilderBundle.test.ts
@@ -1,4 +1,3 @@
-import { existsSync } from "node:fs";
 import { execFile } from "node:child_process";
 import { mkdir, writeFile } from "node:fs/promises";
 import { join } from "node:path";
@@ -10,6 +9,7 @@ import { describe, expect, it } from "vitest";
 import { analyzeInterfaceBuilderBundle } from "../../../src/artifacts/apple/InterfaceBuilderAnalysis.js";
 import { encodeNibArchiveFixture } from "../../../src/artifacts/apple/NibArchive.fixture.js";
 import { thinMach } from "../../../src/domain/binaryTarget.fixture.js";
+import { xcodeIbtoolAvailable } from "../../fixtures/ibtool.js";
 import { createTestTempDirectory } from "../../fixtures/temporaryDirectory.js";
 
 import { interfaceBuilderAnalysisSchema } from "../../../src/domain/apple/interfaceBuilderGraph.js";
@@ -913,7 +913,7 @@ describe("bounded Interface Builder archive decoding", () => {
     );
   });
 
-  it.skipIf(process.platform !== "darwin" || !existsSync("/usr/bin/ibtool"))(
+  it.skipIf(!xcodeIbtoolAvailable)(
     "decodes an Xcode-compiled storyboard NIB and recovers its UI routes",
     async () => {
       const root = await createTestTempDirectory("rea-ib-compiled-test-");
diff --git a/tests/boundary/filesystem/nibNativeHierarchy.test.ts b/tests/boundary/filesystem/nibNativeHierarchy.test.ts
index 2d956246a..e2b948f57 100644
--- a/tests/boundary/filesystem/nibNativeHierarchy.test.ts
+++ b/tests/boundary/filesystem/nibNativeHierarchy.test.ts
@@ -5,6 +5,7 @@ import { promisify } from "node:util";
 
 import { describe, expect, it } from "vitest";
 
+import { xcodeIbtoolAvailable } from "../../fixtures/ibtool.js";
 import { createTestTempDirectory } from "../../fixtures/temporaryDirectory.js";
 import { decodeNibArchive } from "../../../src/artifacts/apple/NibArchive.js";
 import { analyzeInterfaceBuilderBundle } from "../../../src/artifacts/apple/InterfaceBuilderAnalysis.js";
@@ -57,7 +58,7 @@ const compileNestedViews = async (depth: number, withWindow = false) => {
   return { bundle, archive: decodeNibArchive(await readFile(nib)) };
 };
 
-describe.skipIf(process.platform !== "darwin")(
+describe.skipIf(!xcodeIbtoolAvailable)(
   "native compiled NIB view hierarchy",
   () => {
     it.each([4, 40])(
diff --git a/tests/fixtures/ibtool.ts b/tests/fixtures/ibtool.ts
new file mode 100644
index 000000000..c7aef773f
--- /dev/null
+++ b/tests/fixtures/ibtool.ts
@@ -0,0 +1,11 @@
+import { spawnSync } from "node:child_process";
+
+/**
+ * Whether Xcode's ibtool can compile Interface Builder sources on this host.
+ * Command Line Tools install the /usr/bin/ibtool and xcrun shims without the
+ * tool itself, so probe resolution instead of checking the shim path.
+ */
+export const xcodeIbtoolAvailable =
+  process.platform === "darwin" &&
+  spawnSync("/usr/bin/xcrun", ["--find", "ibtool"], { stdio: "ignore" })
+    .status === 0;