diff --git a/.buildchain/kfd-1/libnode-contract-world.witness.json b/.buildchain/kfd-1/libnode-contract-world.witness.json
index 3ac12b6..cee8054 100644
--- a/.buildchain/kfd-1/libnode-contract-world.witness.json
+++ b/.buildchain/kfd-1/libnode-contract-world.witness.json
@@ -33,9 +33,9 @@
     {
       "name": "package-manifest",
       "sourcePath": "package.json",
-      "sourceSha256": "de626755c62f2b3b252e0680b86e5dcddab7fdf8207ed76627e8c780d3210f56",
+      "sourceSha256": "58595a23baf50d1590a231a728056696b9fdf15f196d3d94dff40f55c1206820",
       "artifactPath": "package.json",
-      "expectedSha256": "de626755c62f2b3b252e0680b86e5dcddab7fdf8207ed76627e8c780d3210f56",
+      "expectedSha256": "58595a23baf50d1590a231a728056696b9fdf15f196d3d94dff40f55c1206820",
       "byteForByte": true
     },
     {
@@ -49,9 +49,9 @@
     {
       "name": "buildchain-config",
       "sourcePath": "buildchain.toml",
-      "sourceSha256": "3e9634b497b36eb78d3ea5eb0063fc49a98a32d6d34d34047aa5fe72e4de2f58",
+      "sourceSha256": "3013c0ee402d8925416f3426da63cb901bf9cfcd9bbdb674cfd5ec210a3bfbc0",
       "artifactPath": "buildchain.toml",
-      "expectedSha256": "3e9634b497b36eb78d3ea5eb0063fc49a98a32d6d34d34047aa5fe72e4de2f58",
+      "expectedSha256": "3013c0ee402d8925416f3426da63cb901bf9cfcd9bbdb674cfd5ec210a3bfbc0",
       "byteForByte": true
     },
     {
diff --git a/.gyp/libnode-entrypoint.test.js b/.gyp/libnode-entrypoint.test.js
index 25fd732..b232cea 100644
--- a/.gyp/libnode-entrypoint.test.js
+++ b/.gyp/libnode-entrypoint.test.js
@@ -29,13 +29,20 @@ function loadEntrypoint(platform, arch) {
   return { exports, loadedPackages };
 }
 
-test('Linux ARM64 resolves the published platform package', () => {
-  const loaded = loadEntrypoint('linux', 'arm64');
+for (const [platform, arch, identity, packageName] of [
+  ['darwin', 'arm64', 'darwin-arm64', '@kungfu-tech/libnode-darwin-arm64'],
+  ['linux', 'arm64', 'linux-arm64', '@kungfu-tech/libnode-linux-arm64'],
+  ['linux', 'x64', 'linux-x64', '@kungfu-tech/libnode-linux-x64'],
+  ['win32', 'x64', 'win32-x64', '@kungfu-tech/libnode-win32-x64'],
+]) {
+  test(`${identity} resolves the published platform package`, () => {
+    const loaded = loadEntrypoint(platform, arch);
 
-  assert.deepEqual(loaded.loadedPackages, ['@kungfu-tech/libnode-linux-arm64']);
-  assert.equal(loaded.exports.platform, 'linux-arm64');
-  assert.equal(loaded.exports.platformPackageName, '@kungfu-tech/libnode-linux-arm64');
-});
+    assert.deepEqual(loaded.loadedPackages, [packageName]);
+    assert.equal(loaded.exports.platform, identity);
+    assert.equal(loaded.exports.platformPackageName, packageName);
+  });
+}
 
 test('macOS x64 remains explicitly unsupported', () => {
   assert.throws(() => loadEntrypoint('darwin', 'x64'), /Unsupported libnode platform: darwin-x64/);
diff --git a/.gyp/libnode-platform-policy.js b/.gyp/libnode-platform-policy.js
new file mode 100644
index 0000000..7243075
--- /dev/null
+++ b/.gyp/libnode-platform-policy.js
@@ -0,0 +1,62 @@
+const fs = require('node:fs');
+const path = require('node:path');
+
+const repoRoot = path.resolve(__dirname, '..');
+const activeSurfaces = [
+  '.buildchain/kfd-2/public-release-trust.claim.json',
+  '.buildchain/kfd-3/collaboration-interface.json',
+  '.buildchain/kfd-3/collaboration-interface.prebuild.json',
+  '.github/workflows/build.yml',
+  '.github/workflows/release-new-version.yml',
+  '.github/workflows/release-verify.yaml',
+  '.gyp/libnode-kfd3-artifact-verify.js',
+  '.gyp/node-platform-package.js',
+  '.gyp/npm-publish-tarballs.js',
+  'buildchain.toml',
+  'libnode.release.json',
+  'package.json',
+  'src/js/index.js',
+];
+const retiredIdentity = /darwin[-/](?:x64|x86_64)|macos[-/](?:x64|x86_64)|macos-15-intel|libnode-darwin-x64/giu;
+
+function inspectEntries(entries) {
+  const violations = [];
+  for (const entry of entries) {
+    const lines = entry.content.split(/\r?\n/u);
+    for (let index = 0; index < lines.length; index += 1) {
+      const matches = [...lines[index].matchAll(retiredIdentity)].map((match) => match[0]);
+      if (matches.length > 0) {
+        violations.push({
+          path: entry.path,
+          line: index + 1,
+          matches: [...new Set(matches)].sort(),
+        });
+      }
+    }
+  }
+  return {
+    schema: 'libnode.platform-retirement-policy/v1',
+    status: violations.length === 0 ? 'pass' : 'fail',
+    activeSurfaces: entries.map(({ path: entryPath }) => entryPath).sort(),
+    violations,
+  };
+}
+
+function inspectRepository(root = repoRoot) {
+  return inspectEntries(
+    activeSurfaces.map((relative) => ({
+      path: relative,
+      content: fs.readFileSync(path.join(root, relative), 'utf8'),
+    })),
+  );
+}
+
+function main() {
+  const report = inspectRepository();
+  process.stdout.write(`${JSON.stringify(report, null, 2)}\n`);
+  if (report.status !== 'pass') process.exitCode = 1;
+}
+
+if (require.main === module) main();
+
+module.exports = { activeSurfaces, inspectEntries, inspectRepository };
diff --git a/.gyp/libnode-platform-policy.test.js b/.gyp/libnode-platform-policy.test.js
new file mode 100644
index 0000000..edbe246
--- /dev/null
+++ b/.gyp/libnode-platform-policy.test.js
@@ -0,0 +1,31 @@
+const assert = require('node:assert/strict');
+const fs = require('node:fs');
+const path = require('node:path');
+const test = require('node:test');
+
+const { inspectEntries, inspectRepository } = require('./libnode-platform-policy');
+
+const repoRoot = path.resolve(__dirname, '..');
+
+test('all active package and release surfaces exclude retired Intel macOS identities', () => {
+  const report = inspectRepository();
+  assert.equal(report.status, 'pass', JSON.stringify(report.violations));
+  assert.deepEqual(report.violations, []);
+});
+
+test('an active Intel macOS package identity fails closed', () => {
+  const report = inspectEntries([
+    {
+      path: 'package.json',
+      content: JSON.stringify({ optionalDependencies: { '@kungfu-tech/libnode-darwin-x64': '*' } }),
+    },
+  ]);
+  assert.equal(report.status, 'fail');
+  assert.deepEqual(report.violations, [{ path: 'package.json', line: 1, matches: ['libnode-darwin-x64'] }]);
+});
+
+test('public documentation and the main entrypoint keep an explicit negative contract', () => {
+  const read = (relative) => fs.readFileSync(path.join(repoRoot, relative), 'utf8');
+  assert.match(read('README.md'), /macOS x86_64 \(`darwin-x64`\) is explicitly unsupported/u);
+  assert.match(read('.gyp/libnode-entrypoint.test.js'), /Unsupported libnode platform: darwin-x64/u);
+});
diff --git a/buildchain.toml b/buildchain.toml
index f84212c..2dc83aa 100644
--- a/buildchain.toml
+++ b/buildchain.toml
@@ -77,6 +77,7 @@ command = "corepack pnpm sync-kfd-witnesses"
 timeout_minutes = 10
 commands = [
   "node --test .gyp/libnode-entrypoint.test.js",
+  "corepack pnpm verify-platform-policy",
   "node --test .gyp/libnode-kfd-release-evidence.test.js",
   "corepack pnpm verify-release",
   "corepack pnpm verify-kfd-witnesses",
diff --git a/package.json b/package.json
index e09e52b..2aa96a6 100644
--- a/package.json
+++ b/package.json
@@ -40,6 +40,7 @@
     "verify-kfd-witnesses": "node .gyp/libnode-kfd-witnesses.js check",
     "verify-kfd3-artifact": "node .gyp/libnode-kfd3-artifact-verify.js",
     "verify-package-source": "node .gyp/node-platform-package.js verify-source",
+    "verify-platform-policy": "node .gyp/libnode-platform-policy.js && node --test .gyp/libnode-platform-policy.test.js",
     "format": "prettier --write --parser typescript .gyp/*.js src/js/*.js"
   },
   "packageManager": "pnpm@11.9.0",