diff --git a/.github/copilot-instructions.md b/.github/copilot-instructions.md
index e9388be..7efe3ef 100644
--- a/.github/copilot-instructions.md
+++ b/.github/copilot-instructions.md
@@ -13,6 +13,6 @@ Node-API Conformance Test Suite: A pure ECMAScript test suite for Node-API imple
 - **Process Isolation**: The built-in runner for Node.js, run each test in isolation to prevent crashes from aborting entire test suite.
 
 ## Development Focus
-- Port existing tests from `nodejs/node/test/js-native-api` into `tests/engine/` and `nodejs/node/test/node-api` into `tests/runtime/`, removing dependencies on Node.js runtime APIs while preserving test coverage
+- Port existing tests from `nodejs/node/test/js-native-api` into `tests/js-native-api/` and `nodejs/node/test/node-api` into `tests/node-api/`, removing dependencies on Node.js runtime APIs while preserving test coverage
 - Structure tests for easy integration by external implementors
 - Consider following patterns from [web-platform-tests](https://web-platform-tests.org/) and [WebGPU CTS](https://github.com/gpuweb/cts) projects where applicable.
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..c8f0957
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+node_modules/
+/node/
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..6db5959
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,47 @@
+{
+  "name": "node-api-cts",
+  "version": "0.1.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "node-api-cts",
+      "version": "0.1.0",
+      "devDependencies": {
+        "@types/node": "^24.10.1",
+        "typescript": "^5.9.3"
+      }
+    },
+    "node_modules/@types/node": {
+      "version": "24.10.1",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-24.10.1.tgz",
+      "integrity": "sha512-GNWcUTRBgIRJD5zj+Tq0fKOJ5XZajIiBroOF0yvj2bSU1WvNdYS/dn9UxwsujGW4JX06dnHyjV2y9rRaybH0iQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "undici-types": "~7.16.0"
+      }
+    },
+    "node_modules/typescript": {
+      "version": "5.9.3",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.3.tgz",
+      "integrity": "sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "bin": {
+        "tsc": "bin/tsc",
+        "tsserver": "bin/tsserver"
+      },
+      "engines": {
+        "node": ">=14.17"
+      }
+    },
+    "node_modules/undici-types": {
+      "version": "7.16.0",
+      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-7.16.0.tgz",
+      "integrity": "sha512-Zz+aZWSj8LE6zoxD+xrjh4VfkIG8Ya6LvYkZqtUQGJPZjYl53ypCaUwWqo7eI0x66KBGeRo+mlBEkMSeSZ38Nw==",
+      "dev": true,
+      "license": "MIT"
+    }
+  }
+}
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..9dc3a14
--- /dev/null
+++ b/package.json
@@ -0,0 +1,13 @@
+{
+  "name": "node-api-cts",
+  "version": "0.1.0",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "shallow-checkout-nodejs": "node ./tools/shallow-checkout-nodejs.ts"
+  },
+  "devDependencies": {
+    "@types/node": "^24.10.1",
+    "typescript": "^5.9.3"
+  }
+}
diff --git a/tools/shallow-checkout-nodejs.ts b/tools/shallow-checkout-nodejs.ts
new file mode 100644
index 0000000..ae4ef3f
--- /dev/null
+++ b/tools/shallow-checkout-nodejs.ts
@@ -0,0 +1,95 @@
+#!/usr/bin/env node
+import assert from "node:assert/strict";
+import {
+  spawnSync,
+  type SpawnSyncOptionsWithStringEncoding,
+} from "node:child_process";
+import { cpSync, mkdtempSync, mkdirSync, rmSync } from "node:fs";
+import path from "node:path";
+import { tmpdir } from "node:os";
+
+const PATHS = ["test/js-native-api", "test/node-api", "doc/api/n-api.md"];
+const NODE_REPO_URL = "https://github.com/nodejs/node.git";
+const ROOT_PATH = path.resolve(import.meta.dirname, "..");
+const NODE_ROOT_PATH = path.join(ROOT_PATH, "node");
+
+function getOptionsFromArgs([ref = "main"]: string[]) {
+  return { ref };
+}
+
+function runGit(
+  args: string[],
+  options: Partial<SpawnSyncOptionsWithStringEncoding> = {}
+) {
+  const result = spawnSync("git", args, {
+    stdio: options.stdio ?? "inherit",
+    encoding: options.encoding ?? "utf8",
+    cwd: options.cwd,
+  });
+
+  assert(!result.error, result.error);
+  assert.equal(
+    result.status,
+    0,
+    `git ${args.join(" ")} exited with ${result.status ?? "unknown"}`
+  );
+
+  return result;
+}
+
+function ensureGitAvailable() {
+  return runGit(["--version"], { stdio: "pipe" }).stdout.trim();
+}
+
+function copyPath(source: string, destination: string) {
+  rmSync(destination, { recursive: true, force: true });
+
+  mkdirSync(path.dirname(destination), { recursive: true });
+  cpSync(source, destination, { recursive: true });
+}
+
+function main() {
+  const { ref } = getOptionsFromArgs(process.argv.slice(2));
+  mkdirSync(NODE_ROOT_PATH, { recursive: true });
+
+  const gitVersion = ensureGitAvailable();
+  console.log(`Using ${gitVersion}`);
+
+  const tempDir = mkdtempSync(path.join(tmpdir(), "node-tests-"));
+  console.log(`Cloning ${NODE_REPO_URL} @ ${ref} into ${tempDir}`);
+
+  try {
+    runGit([
+      "clone",
+      "--depth=1",
+      "--filter=blob:none",
+      "--sparse",
+      "--branch",
+      ref,
+      NODE_REPO_URL,
+      tempDir,
+    ]);
+
+    runGit(["sparse-checkout", "set", "--no-cone", ...PATHS], {
+      cwd: tempDir,
+    });
+
+    for (const sourcePath of PATHS) {
+      const source = path.join(tempDir, sourcePath);
+      const destination = path.join(NODE_ROOT_PATH, sourcePath);
+      console.log(`Updating ${destination}`);
+      copyPath(source, destination);
+    }
+  } finally {
+    rmSync(tempDir, { recursive: true, force: true });
+  }
+
+  console.log("Node.js tests and docs checkout complete.");
+}
+
+try {
+  main();
+} catch (error) {
+  console.error(error instanceof Error ? error.message : error);
+  process.exitCode = 1;
+}
diff --git a/tools/tsconfig.json b/tools/tsconfig.json
new file mode 100644
index 0000000..9cb9d34
--- /dev/null
+++ b/tools/tsconfig.json
@@ -0,0 +1,14 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "NodeNext",
+    "moduleResolution": "NodeNext",
+    "strict": true,
+    "types": ["node"],
+    "esModuleInterop": true,
+    "forceConsistentCasingInFileNames": true,
+    "skipLibCheck": true,
+    "noEmit": true
+  },
+  "include": ["**/*.ts"]
+}