diff --git a/package.json b/package.json
index 36461b7..42c26e1 100644
--- a/package.json
+++ b/package.json
@@ -51,7 +51,7 @@
   "dependencies": {
     "@antelopejs/interface-api": ">=0.0.11 <1.0.0",
     "@antelopejs/interface-api-util": "^0.1.1",
-    "@antelopejs/interface-core": "^0.0.6",
+    "@antelopejs/interface-core": ">=0.0.6 <1.0.0",
     "reflect-metadata": "^0.2.2",
     "ws": "^8.20.0"
   },
diff --git a/playground/package.json b/playground/package.json
index 91f7d8a..10b6198 100644
--- a/playground/package.json
+++ b/playground/package.json
@@ -8,7 +8,7 @@
   "dependencies": {
     "@antelopejs/interface-api": "^0.0.8",
     "@antelopejs/interface-api-util": "^0.1.1",
-    "@antelopejs/interface-core": "^0.0.6"
+    "@antelopejs/interface-core": ">=0.0.6 <1.0.0"
   },
   "devDependencies": {
     "@types/node": "^20.5.7",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 1b0f70f..d27be23 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -10,13 +10,13 @@ importers:
     dependencies:
       '@antelopejs/interface-api':
         specifier: '>=0.0.11 <1.0.0'
-        version: 0.0.11(@antelopejs/interface-core@0.0.6)
+        version: 0.0.11(@antelopejs/interface-core@0.0.11)
       '@antelopejs/interface-api-util':
         specifier: ^0.1.1
-        version: 0.1.1(@antelopejs/interface-api@0.0.11(@antelopejs/interface-core@0.0.6))(@antelopejs/interface-core@0.0.6)
+        version: 0.1.1(@antelopejs/interface-api@0.0.11(@antelopejs/interface-core@0.0.11))(@antelopejs/interface-core@0.0.11)
       '@antelopejs/interface-core':
-        specifier: ^0.0.6
-        version: 0.0.6
+        specifier: '>=0.0.6 <1.0.0'
+        version: 0.0.11
       reflect-metadata:
         specifier: ^0.2.2
         version: 0.2.2
@@ -59,13 +59,13 @@ importers:
     dependencies:
       '@antelopejs/interface-api':
         specifier: ^0.0.8
-        version: 0.0.8(@antelopejs/interface-core@0.0.6)
+        version: 0.0.8(@antelopejs/interface-core@0.0.11)
       '@antelopejs/interface-api-util':
         specifier: ^0.1.1
-        version: 0.1.1(@antelopejs/interface-api@0.0.8(@antelopejs/interface-core@0.0.6))(@antelopejs/interface-core@0.0.6)
+        version: 0.1.1(@antelopejs/interface-api@0.0.8(@antelopejs/interface-core@0.0.11))(@antelopejs/interface-core@0.0.11)
       '@antelopejs/interface-core':
-        specifier: ^0.0.6
-        version: 0.0.6
+        specifier: '>=0.0.6 <1.0.0'
+        version: 0.0.11
     devDependencies:
       '@types/node':
         specifier: ^20.5.7
@@ -95,8 +95,8 @@ packages:
     peerDependencies:
       '@antelopejs/interface-core': '>=0.0.3 <1.0.0'
 
-  '@antelopejs/interface-core@0.0.6':
-    resolution: {integrity: sha512-OMna86iT/ylL6wJl6FCPw9ieddULXGs4jTmeiDBNEXYQ9acnVXjS/+SaN0UR0h7oY7WTD9VwKXVwG95qjNIA1w==}
+  '@antelopejs/interface-core@0.0.11':
+    resolution: {integrity: sha512-eKE3F9XY0eIzdLBXms8QAY4BHmA8+XXZnta0vZ411q9GiSbI2S1Q3lfYzmnXU4ZK9i+/SIYPplOsA02gIdxODg==}
 
   '@biomejs/biome@2.3.2':
     resolution: {integrity: sha512-8e9tzamuDycx7fdrcJ/F/GDZ8SYukc5ud6tDicjjFqURKYFSWMl0H0iXNXZEGmcmNUmABgGuHThPykcM41INgg==}
@@ -1231,25 +1231,25 @@ packages:
 
 snapshots:
 
-  '@antelopejs/interface-api-util@0.1.1(@antelopejs/interface-api@0.0.11(@antelopejs/interface-core@0.0.6))(@antelopejs/interface-core@0.0.6)':
+  '@antelopejs/interface-api-util@0.1.1(@antelopejs/interface-api@0.0.11(@antelopejs/interface-core@0.0.11))(@antelopejs/interface-core@0.0.11)':
     dependencies:
-      '@antelopejs/interface-api': 0.0.11(@antelopejs/interface-core@0.0.6)
-      '@antelopejs/interface-core': 0.0.6
+      '@antelopejs/interface-api': 0.0.11(@antelopejs/interface-core@0.0.11)
+      '@antelopejs/interface-core': 0.0.11
 
-  '@antelopejs/interface-api-util@0.1.1(@antelopejs/interface-api@0.0.8(@antelopejs/interface-core@0.0.6))(@antelopejs/interface-core@0.0.6)':
+  '@antelopejs/interface-api-util@0.1.1(@antelopejs/interface-api@0.0.8(@antelopejs/interface-core@0.0.11))(@antelopejs/interface-core@0.0.11)':
     dependencies:
-      '@antelopejs/interface-api': 0.0.8(@antelopejs/interface-core@0.0.6)
-      '@antelopejs/interface-core': 0.0.6
+      '@antelopejs/interface-api': 0.0.8(@antelopejs/interface-core@0.0.11)
+      '@antelopejs/interface-core': 0.0.11
 
-  '@antelopejs/interface-api@0.0.11(@antelopejs/interface-core@0.0.6)':
+  '@antelopejs/interface-api@0.0.11(@antelopejs/interface-core@0.0.11)':
     dependencies:
-      '@antelopejs/interface-core': 0.0.6
+      '@antelopejs/interface-core': 0.0.11
 
-  '@antelopejs/interface-api@0.0.8(@antelopejs/interface-core@0.0.6)':
+  '@antelopejs/interface-api@0.0.8(@antelopejs/interface-core@0.0.11)':
     dependencies:
-      '@antelopejs/interface-core': 0.0.6
+      '@antelopejs/interface-core': 0.0.11
 
-  '@antelopejs/interface-core@0.0.6':
+  '@antelopejs/interface-core@0.0.11':
     dependencies:
       reflect-metadata: 0.2.2
 
diff --git a/src/implementations/api/index.ts b/src/implementations/api/index.ts
index 404444b..d05e4cd 100644
--- a/src/implementations/api/index.ts
+++ b/src/implementations/api/index.ts
@@ -298,3 +298,5 @@ export const routesProxy = {
     return routes;
   },
 };
+
+export const internal = { routesProxy };
diff --git a/src/test/controller-resolution.test.ts b/src/test/controller-resolution.test.ts
index ad7b304..a5dbb07 100644
--- a/src/test/controller-resolution.test.ts
+++ b/src/test/controller-resolution.test.ts
@@ -1,5 +1,7 @@
 import assert from "node:assert";
+import { spawnSync } from "node:child_process";
 import { createServer, type Server } from "node:http";
+import { resolve } from "node:path";
 import {
   type ComputedParameter,
   ControllerMeta,
@@ -114,6 +116,23 @@ describe("Controller resolution", () => {
     await close(server);
   });
 
+  it("attaches the full implementation through the nested interface contract", () => {
+    const result = spawnSync(
+      process.execPath,
+      [
+        "-e",
+        `const { ImplementInterface } = require("@antelopejs/interface-core");
+        ImplementInterface(
+          require("@antelopejs/interface-api"),
+          require("./dist/implementations/api"),
+        );`,
+      ],
+      { cwd: resolve(__dirname, "../.."), encoding: "utf8" },
+    );
+
+    assert.equal(result.status, 0, result.stderr);
+  });
+
   it("isolates computed properties across concurrent requests", async () => {
     const Controller = createController();
     const properties = {