diff --git a/cocoscreator_projects/YouleNexus/assets/framework/sdk/runtime/game-session-host.ts b/cocoscreator_projects/YouleNexus/assets/framework/sdk/runtime/game-session-host.ts
index 8ac0dda..0f35ced 100644
--- a/cocoscreator_projects/YouleNexus/assets/framework/sdk/runtime/game-session-host.ts
+++ b/cocoscreator_projects/YouleNexus/assets/framework/sdk/runtime/game-session-host.ts
@@ -5,9 +5,8 @@ import type {
   GameServerMessage,
   PlatformToGameEvent,
 } from '../contracts/index.ts';
-import { Route } from '../../core/constants.ts';
 
-const RESERVED_ROUTES = new Set<string>(Object.values(Route));
+const RESERVED_GAME_ENTRY_ROUTES = new Set(['platform', 'agent', 'room']);
 const GAME_SESSION_OPEN_FAULT_BRAND = Symbol.for(
   'youle.framework.sdk.GameSessionOpenFault',
 );
@@ -104,7 +103,7 @@ export function assertGameEntry(entry: GameEntry): void {
 /** The single GameEntry route admission check shared by runtime adapters. */
 export function assertGameRoute(route: unknown): asserts route is string {
   assertNonEmptyText(route, 'route');
-  if (RESERVED_ROUTES.has(route)) {
+  if (RESERVED_GAME_ENTRY_ROUTES.has(route)) {
     throw new Error(`GameEntry reserved route: ${route}`);
   }
 }
diff --git a/cocoscreator_projects/framework-tests/architecture/import-boundaries.test.mjs b/cocoscreator_projects/framework-tests/architecture/import-boundaries.test.mjs
index 2a4d07b..10c8ae9 100644
--- a/cocoscreator_projects/framework-tests/architecture/import-boundaries.test.mjs
+++ b/cocoscreator_projects/framework-tests/architecture/import-boundaries.test.mjs
@@ -187,6 +187,36 @@ test('scanner rejects sdk contracts importing a framework platform path', async
   assert.match(scan(root)[0].message, /sdk.*platform/);
 });
 
+test('scanner rejects every sdk runtime dependency on framework implementation layers', async () => {
+  const layers = [
+    'core',
+    'platform',
+    'net',
+    'config',
+    'native',
+    'protocol',
+    'application',
+    'domain',
+    'presentation',
+    'ui',
+    'compat',
+  ];
+
+  for (const layer of layers) {
+    const root = await createFixtureRoot();
+    await writeFixture(root, `framework/${layer}/internal.ts`, 'export const value = true\n');
+    await writeFixture(
+      root,
+      'framework/sdk/runtime/bad.ts',
+      `import { value } from '../../${layer}/internal.ts'; void value\n`,
+    );
+
+    const violations = scan(root);
+    assert.equal(violations.length, 1, layer);
+    assert.match(violations[0].message, /sdk.*framework implementation/, layer);
+  }
+});
+
 test('scanner rejects game imports of framework net internals', async () => {
   const root = await createFixtureRoot();
   await writeFixture(root, 'games/a/assets/game/bad.ts', "import '../../../framework/net/net-client.ts'\n");
diff --git a/cocoscreator_projects/framework-tests/platform/game-host-adapter.test.ts b/cocoscreator_projects/framework-tests/platform/game-host-adapter.test.ts
index 31f22a0..281707e 100644
--- a/cocoscreator_projects/framework-tests/platform/game-host-adapter.test.ts
+++ b/cocoscreator_projects/framework-tests/platform/game-host-adapter.test.ts
@@ -122,14 +122,6 @@ test('Task 1 route validator is the shared authority for game-route admission',
   for (const route of ['platform', 'agent', 'room']) {
     assert.throws(() => assertGameRoute(route), /reserved.*route/i);
   }
-
-  const validatorSource = readFileSync(new URL(
-    '../../YouleNexus/assets/framework/sdk/runtime/game-session-host.ts',
-    import.meta.url,
-  ), 'utf8');
-  assert.match(validatorSource, /import \{ Route \} from '\.\.\/\.\.\/core\/constants\.ts';/);
-  assert.match(validatorSource, /new Set<string>\(Object\.values\(Route\)\)/);
-  assert.doesNotMatch(validatorSource, /new Set\(\[['"]platform['"]/);
 });
 
 test('execute exposes only the GameHost command union and delegates semantic commands', () => {
diff --git a/cocoscreator_projects/scripts/lib/import-boundaries.mjs b/cocoscreator_projects/scripts/lib/import-boundaries.mjs
index 9a71be0..7a03049 100644
--- a/cocoscreator_projects/scripts/lib/import-boundaries.mjs
+++ b/cocoscreator_projects/scripts/lib/import-boundaries.mjs
@@ -221,6 +221,7 @@ function findViolation(context) {
   const filePath = displayPath(file);
   const resolvedPath = resolved ? displayPath(resolved) : specifier;
   const isContract = CONTRACTS_PATH.test(filePath);
+  const isSdk = SDK_ALLOWED.test(filePath);
   const isGame = isInside(file, gamesDir);
   const isFramework = isInside(file, frameworkDir);
 
@@ -232,6 +233,14 @@ function findViolation(context) {
     return violation(filePath, specifier, `sdk/contracts may import only sibling contracts; sdk path resolved to ${resolvedPath}`);
   }
 
+  if (isSdk
+    && !isSdkMigrationBarrel(filePath, frameworkDir)
+    && resolved
+    && isInside(resolved, frameworkDir)
+    && !SDK_ALLOWED.test(resolvedPath)) {
+    return violation(filePath, specifier, `sdk cannot import framework implementation ${resolvedPath}`);
+  }
+
   if (isGame && resolved && isFrameworkReference(resolved, frameworkDir) && !SDK_ALLOWED.test(resolvedPath)) {
     return violation(filePath, specifier, `game code may import only framework/sdk; game import resolved to ${resolvedPath}`);
   }
@@ -264,6 +273,10 @@ function isLegacyRuntimeImporter(filePath, frameworkDir) {
   return filePath === `${normalizedFrameworkDir}/sdk/index.ts` || LEGACY_RUNTIME.test(filePath);
 }
 
+function isSdkMigrationBarrel(filePath, frameworkDir) {
+  return filePath === `${displayPath(frameworkDir)}/sdk/index.ts`;
+}
+
 /**
  * ActiveGame is the retained compatibility owner of IGameModule until Task 11
  * removes both it and the migration-only declarations from sdk/index.ts.