diff --git a/docs/gstack-2/JUDGMENT-PROVENANCE.json b/docs/gstack-2/JUDGMENT-PROVENANCE.json
index 2a88f16b3..cebc6210d 100644
--- a/docs/gstack-2/JUDGMENT-PROVENANCE.json
+++ b/docs/gstack-2/JUDGMENT-PROVENANCE.json
@@ -6543,6 +6543,10 @@
     {
       "name": "browse",
       "source_path": "browse/dist/browse",
+      "platform_source_paths": {
+        "posix": "browse/dist/browse",
+        "win32": "browse/dist/browse.exe"
+      },
       "consumer_modules": [
         "benchmark",
         "browse",
@@ -6831,6 +6835,10 @@
     {
       "name": "gstack-design",
       "source_path": "design/dist/design",
+      "platform_source_paths": {
+        "posix": "design/dist/design",
+        "win32": "design/dist/design.exe"
+      },
       "consumer_modules": [
         "design-consultation",
         "design-html",
@@ -7712,6 +7720,10 @@
     {
       "name": "make-pdf",
       "source_path": "make-pdf/dist/pdf",
+      "platform_source_paths": {
+        "posix": "make-pdf/dist/pdf",
+        "win32": "make-pdf/dist/pdf.exe"
+      },
       "consumer_modules": [
         "make-pdf"
       ],
diff --git a/evals/parity/manifest.json b/evals/parity/manifest.json
index 2a88f16b3..cebc6210d 100644
--- a/evals/parity/manifest.json
+++ b/evals/parity/manifest.json
@@ -6543,6 +6543,10 @@
     {
       "name": "browse",
       "source_path": "browse/dist/browse",
+      "platform_source_paths": {
+        "posix": "browse/dist/browse",
+        "win32": "browse/dist/browse.exe"
+      },
       "consumer_modules": [
         "benchmark",
         "browse",
@@ -6831,6 +6835,10 @@
     {
       "name": "gstack-design",
       "source_path": "design/dist/design",
+      "platform_source_paths": {
+        "posix": "design/dist/design",
+        "win32": "design/dist/design.exe"
+      },
       "consumer_modules": [
         "design-consultation",
         "design-html",
@@ -7712,6 +7720,10 @@
     {
       "name": "make-pdf",
       "source_path": "make-pdf/dist/pdf",
+      "platform_source_paths": {
+        "posix": "make-pdf/dist/pdf",
+        "win32": "make-pdf/dist/pdf.exe"
+      },
       "consumer_modules": [
         "make-pdf"
       ],
diff --git a/evals/parity/runtime-helper-closure.json b/evals/parity/runtime-helper-closure.json
index c9a81cf7d..efa9dc8bc 100644
--- a/evals/parity/runtime-helper-closure.json
+++ b/evals/parity/runtime-helper-closure.json
@@ -6,6 +6,10 @@
     {
       "name": "browse",
       "source_path": "browse/dist/browse",
+      "platform_source_paths": {
+        "posix": "browse/dist/browse",
+        "win32": "browse/dist/browse.exe"
+      },
       "consumer_modules": [
         "benchmark",
         "browse",
@@ -294,6 +298,10 @@
     {
       "name": "gstack-design",
       "source_path": "design/dist/design",
+      "platform_source_paths": {
+        "posix": "design/dist/design",
+        "win32": "design/dist/design.exe"
+      },
       "consumer_modules": [
         "design-consultation",
         "design-html",
@@ -1175,6 +1183,10 @@
     {
       "name": "make-pdf",
       "source_path": "make-pdf/dist/pdf",
+      "platform_source_paths": {
+        "posix": "make-pdf/dist/pdf",
+        "win32": "make-pdf/dist/pdf.exe"
+      },
       "consumer_modules": [
         "make-pdf"
       ],
diff --git a/scripts/gstack2/generate-skill-tree.ts b/scripts/gstack2/generate-skill-tree.ts
index 23ffa1690..aec5a59d9 100644
--- a/scripts/gstack2/generate-skill-tree.ts
+++ b/scripts/gstack2/generate-skill-tree.ts
@@ -599,22 +599,28 @@ function runtimeHelperClosure(rendered: Map<string, RenderedModuleRecord>): Arra
       consumers.set(match[1], sources);
     }
   }
+  const platformSourceOverrides: Record<string, { posix: string; win32: string }> = {
+    browse: { posix: 'browse/dist/browse', win32: 'browse/dist/browse.exe' },
+    'gstack-design': { posix: 'design/dist/design', win32: 'design/dist/design.exe' },
+    'make-pdf': { posix: 'make-pdf/dist/pdf', win32: 'make-pdf/dist/pdf.exe' },
+  };
   const sourceOverrides: Record<string, string> = {
-    browse: process.platform === 'win32' ? 'browse/dist/browse.exe' : 'browse/dist/browse',
-    'gstack-design': process.platform === 'win32' ? 'design/dist/design.exe' : 'design/dist/design',
-    'make-pdf': process.platform === 'win32' ? 'make-pdf/dist/pdf.exe' : 'make-pdf/dist/pdf',
     'remote-slug': 'browse/bin/remote-slug',
     'gstack-gbrain-sync': 'bin/gstack-gbrain-sync.ts',
     'gstack-memory-ingest': 'bin/gstack-memory-ingest.ts',
     'gstack-global-discover': 'bin/gstack-global-discover.ts',
     'gstack-redact-audit-log': 'bin/gstack-redact-audit-log',
   };
-  return [...consumers].sort(([left], [right]) => left.localeCompare(right)).map(([name, sources]) => ({
-    name,
-    source_path: sourceOverrides[name] ?? `bin/${name}`,
-    consumer_modules: [...sources].sort(),
-    stable_path: `\${GSTACK_HOME:-$HOME/.gstack}/bin/${name}`,
-  }));
+  return [...consumers].sort(([left], [right]) => left.localeCompare(right)).map(([name, sources]) => {
+    const platformPaths = platformSourceOverrides[name];
+    return {
+      name,
+      source_path: platformPaths?.posix ?? sourceOverrides[name] ?? `bin/${name}`,
+      ...(platformPaths ? { platform_source_paths: platformPaths } : {}),
+      consumer_modules: [...sources].sort(),
+      stable_path: `\${GSTACK_HOME:-$HOME/.gstack}/bin/${name}`,
+    };
+  });
 }
 
 interface SectionCopyRecord {
diff --git a/scripts/gstack2/run-parity.ts b/scripts/gstack2/run-parity.ts
index 92b95adc3..1e81913a6 100644
--- a/scripts/gstack2/run-parity.ts
+++ b/scripts/gstack2/run-parity.ts
@@ -248,7 +248,9 @@ export function runParity(): ParityResult {
   const helperClosure = json(path.join(ROOT, 'evals', 'parity', 'runtime-helper-closure.json'));
   check(JSON.stringify(helperClosure.helpers) === JSON.stringify(manifest.runtime_helpers), 'Runtime helper closure and provenance differ');
   for (const helper of helperClosure.helpers) {
-    check(fs.existsSync(path.join(ROOT, helper.source_path)), `Preserved helper ${helper.name} has no source payload at ${helper.source_path}`);
+    const sourcePath = helper.platform_source_paths?.[process.platform === 'win32' ? 'win32' : 'posix']
+      ?? helper.source_path;
+    check(fs.existsSync(path.join(ROOT, sourcePath)), `Preserved helper ${helper.name} has no source payload at ${sourcePath}`);
     check(Array.isArray(helper.consumer_modules) && helper.consumer_modules.length > 0, `Preserved helper ${helper.name} has no consumer provenance`);
   }
   for (const record of [...manifest.sources, ...manifest.sections]) {
diff --git a/test/gstack2-runtime-core.test.ts b/test/gstack2-runtime-core.test.ts
index 0938aaddc..bc003e1b2 100644
--- a/test/gstack2-runtime-core.test.ts
+++ b/test/gstack2-runtime-core.test.ts
@@ -99,7 +99,7 @@ describe("gstack 2 host-neutral paths and state", () => {
     const { state } = await inspectProject(home, identity);
     expect(state.concurrentCounter).toBe(60);
     expect(state.revision).toBe(60);
-  });
+  }, 15_000);
 
   test("crash/resume never automatically repeats an uncertain external effect", async () => {
     const root = await temporaryRoot();
diff --git a/test/gstack2-runtime-install.test.ts b/test/gstack2-runtime-install.test.ts
index 5dff7a178..3d3c848f8 100644
--- a/test/gstack2-runtime-install.test.ts
+++ b/test/gstack2-runtime-install.test.ts
@@ -128,6 +128,16 @@ describe("GStack 2 managed runtime installer", () => {
 
   test("generated helper closure is fully declared and selected helpers resolve from the managed home", async () => {
     const contract = await readJson(path.join(REPO_ROOT, "evals", "parity", "runtime-helper-closure.json"));
+    const compiledHelpers = Object.fromEntries(
+      contract.helpers
+        .filter((helper) => helper.platform_source_paths)
+        .map((helper) => [helper.name, helper.platform_source_paths]),
+    );
+    expect(compiledHelpers).toEqual({
+      browse: { posix: "browse/dist/browse", win32: "browse/dist/browse.exe" },
+      "gstack-design": { posix: "design/dist/design", win32: "design/dist/design.exe" },
+      "make-pdf": { posix: "make-pdf/dist/pdf", win32: "make-pdf/dist/pdf.exe" },
+    });
     const bundlePaths = new Set(DEFAULT_RUNTIME_BUNDLE.map((item) => item.path));
     for (const dependency of [
       "node_modules/sharp",
@@ -139,10 +149,12 @@ describe("GStack 2 managed runtime installer", () => {
     expect(bundlePaths.has("node_modules/@ngrok")).toBe(false);
     expect([...bundlePaths].some((item) => item.includes("@huggingface"))).toBe(false);
     for (const helper of contract.helpers) {
-      expect(bundlePaths.has(helper.source_path)).toBe(true);
+      const sourcePath = helper.platform_source_paths?.[process.platform === "win32" ? "win32" : "posix"]
+        ?? helper.source_path;
+      expect(bundlePaths.has(sourcePath)).toBe(true);
       if (helper.name === "gstack") continue;
       const declaredTarget = DEFAULT_RUNTIME_HELPERS[helper.name]?.target ?? DEFAULT_CAPABILITY_LAUNCHERS[helper.name];
-      expect(declaredTarget).toBe(helper.source_path);
+      expect(declaredTarget).toBe(sourcePath);
     }
 
     await withFixture(async ({ home }) => {