diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
new file mode 100644
index 0000000..7cc64ee
--- /dev/null
+++ b/.github/workflows/check.yml
@@ -0,0 +1,43 @@
+name: Check
+
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+
+permissions:
+  contents: read
+
+jobs:
+  check:
+    name: Check (${{ matrix.os }}, Node ${{ matrix.node-version }})
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os:
+          - ubuntu-latest
+          - windows-latest
+        node-version:
+          - "20.20.2"
+          - "24"
+    steps:
+      - name: Enable symbolic links
+        if: runner.os == 'Windows'
+        run: git config --global core.symlinks true
+      - name: Check out repository
+        uses: actions/checkout@v6
+      - name: Set up pnpm
+        uses: pnpm/action-setup@v6
+        with:
+          run_install: false
+      - name: Set up Node.js
+        uses: actions/setup-node@v6
+        with:
+          node-version: ${{ matrix.node-version }}
+          cache: pnpm
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+      - name: Check repository
+        run: pnpm run check
diff --git a/.github/workflows/publish-package.yml b/.github/workflows/publish-package.yml
index 48e6c87..35285bd 100644
--- a/.github/workflows/publish-package.yml
+++ b/.github/workflows/publish-package.yml
@@ -17,25 +17,29 @@ jobs:
     steps:
       - name: Check out repository
         uses: actions/checkout@v6
+      - name: Set up pnpm
+        uses: pnpm/action-setup@v6
+        with:
+          run_install: false
       - name: Set up Node.js
         uses: actions/setup-node@v6
         with:
           node-version: 24
           registry-url: https://npm.pkg.github.com
           scope: "@paperkeel"
-          cache: npm
+          cache: pnpm
       - name: Install dependencies
-        run: npm ci
+        run: pnpm install --frozen-lockfile
       - name: Check package
-        run: npm run check
+        run: pnpm run check
       - name: Verify release version
         if: github.event_name == 'release'
         run: |
-          package_version="$(npm pkg get version | tr -d '\"')"
+          package_version="$(node -p "require('./package.json').version")"
           test "v${package_version}" = "${RELEASE_TAG}"
         env:
           RELEASE_TAG: ${{ github.event.release.tag_name }}
       - name: Publish package
-        run: npm publish --registry https://npm.pkg.github.com
+        run: pnpm publish --no-git-checks --registry https://npm.pkg.github.com
         env:
           NODE_AUTH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
diff --git a/AGENTS.md b/AGENTS.md
index b01bf22..f28823c 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -33,7 +33,7 @@ creator validator.
 Run this command after each change:
 
 ```bash
-./scripts/check.sh
+pnpm run check
 ```
 
 The repository has no automatic correction command.
diff --git a/package-lock.json b/package-lock.json
deleted file mode 100644
index 5142cf0..0000000
--- a/package-lock.json
+++ /dev/null
@@ -1,834 +0,0 @@
-{
-  "name": "@paperkeel/oxlint-plugin-semark",
-  "version": "0.1.2",
-  "lockfileVersion": 3,
-  "requires": true,
-  "packages": {
-    "": {
-      "name": "@paperkeel/oxlint-plugin-semark",
-      "version": "0.1.2",
-      "license": "MIT",
-      "dependencies": {
-        "@microsoft/tsdoc": "0.16.0",
-        "@oxlint/plugins": "1.80.0"
-      },
-      "devDependencies": {
-        "@types/node": "24.10.1",
-        "oxlint": "1.80.0",
-        "typescript": "7.0.2"
-      },
-      "engines": {
-        "node": ">=20.19.0"
-      },
-      "peerDependencies": {
-        "oxlint": ">=1.80.0 <2"
-      }
-    },
-    "node_modules/@microsoft/tsdoc": {
-      "version": "0.16.0",
-      "resolved": "https://registry.npmjs.org/@microsoft/tsdoc/-/tsdoc-0.16.0.tgz",
-      "integrity": "sha512-xgAyonlVVS+q7Vc7qLW0UrJU7rSFcETRWsqdXZtjzRU8dF+6CkozTK4V4y1LwOX7j8r/vHphjDeMeGI4tNGeGA==",
-      "license": "MIT"
-    },
-    "node_modules/@oxlint/binding-android-arm-eabi": {
-      "version": "1.80.0",
-      "resolved": "https://registry.npmjs.org/@oxlint/binding-android-arm-eabi/-/binding-android-arm-eabi-1.80.0.tgz",
-      "integrity": "sha512-RM3Plj+biQpxa5d1GOOX6ciDlcUROmm4OZ/pLTpitkQt2mJv4jhtY4cbgaetOm5UKWZe05/TGQ6o1Vl8EOHkrA==",
-      "cpu": [
-        "arm"
-      ],
-      "dev": true,
-      "license": "MIT",
-      "optional": true,
-      "os": [
-        "android"
-      ],
-      "engines": {
-        "node": "^20.19.0 || >=22.12.0"
-      }
-    },
-    "node_modules/@oxlint/binding-android-arm64": {
-      "version": "1.80.0",
-      "resolved": "https://registry.npmjs.org/@oxlint/binding-android-arm64/-/binding-android-arm64-1.80.0.tgz",
-      "integrity": "sha512-YlO5JEf0Yr2bUUlu8O8daVcUxtcGGbcSmyV7E7nSbJbfAdxTE0PFPwgnIlw7wXJaTYjb+qs5hI5q3jxUkI7cAw==",
-      "cpu": [
-        "arm64"
-      ],
-      "dev": true,
-      "license": "MIT",
-      "optional": true,
-      "os": [
-        "android"
-      ],
-      "engines": {
-        "node": "^20.19.0 || >=22.12.0"
-      }
-    },
-    "node_modules/@oxlint/binding-darwin-arm64": {
-      "version": "1.80.0",
-      "resolved": "https://registry.npmjs.org/@oxlint/binding-darwin-arm64/-/binding-darwin-arm64-1.80.0.tgz",
-      "integrity": "sha512-BULDOyO3AhsmdWfQeIUCykDt3dd7XZBGLhp1eIh56skRv01O+cNjNPwXMIbeW1x4+pxcln5if72wcRgViVo7PA==",
-      "cpu": [
-        "arm64"
-      ],
-      "dev": true,
-      "license": "MIT",
-      "optional": true,
-      "os": [
-        "darwin"
-      ],
-      "engines": {
-        "node": "^20.19.0 || >=22.12.0"
-      }
-    },
-    "node_modules/@oxlint/binding-darwin-x64": {
-      "version": "1.80.0",
-      "resolved": "https://registry.npmjs.org/@oxlint/binding-darwin-x64/-/binding-darwin-x64-1.80.0.tgz",
-      "integrity": "sha512-YJ4JzLw7N5TDSQFlA0hAQGHvnDZgyypm1yunObVWcWiF9KM7eGCJKYKLgTC2Fi/57OdnBhbj4OkzPGdFQJ6HyA==",
-      "cpu": [
-        "x64"
-      ],
-      "dev": true,
-      "license": "MIT",
-      "optional": true,
-      "os": [
-        "darwin"
-      ],
-      "engines": {
-        "node": "^20.19.0 || >=22.12.0"
-      }
-    },
-    "node_modules/@oxlint/binding-freebsd-x64": {
-      "version": "1.80.0",
-      "resolved": "https://registry.npmjs.org/@oxlint/binding-freebsd-x64/-/binding-freebsd-x64-1.80.0.tgz",
-      "integrity": "sha512-AYUIk5QnL0s8oWAYsREZwkRYy1SupJTXALo93J1TgzHywxQtdM99FecRMQ87MXEdPQ0j1TmEpeeq3fGNkpvMqg==",
-      "cpu": [
-        "x64"
-      ],
-      "dev": true,
-      "license": "MIT",
-      "optional": true,
-      "os": [
-        "freebsd"
-      ],
-      "engines": {
-        "node": "^20.19.0 || >=22.12.0"
-      }
-    },
-    "node_modules/@oxlint/binding-linux-arm-gnueabihf": {
-      "version": "1.80.0",
-      "resolved": "https://registry.npmjs.org/@oxlint/binding-linux-arm-gnueabihf/-/binding-linux-arm-gnueabihf-1.80.0.tgz",
-      "integrity": "sha512-9hBZVANupQ89W9dXyE0n8doCyaW5pDyGn3y6XlIMPZ+rIKuyqkr3SNUXmVJIhuvUq0NBU3RBiSXXE69l4XI6KA==",
-      "cpu": [
-        "arm"
-      ],
-      "dev": true,
-      "license": "MIT",
-      "optional": true,
-      "os": [
-        "linux"
-      ],
-      "engines": {
-        "node": "^20.19.0 || >=22.12.0"
-      }
-    },
-    "node_modules/@oxlint/binding-linux-arm-musleabihf": {
-      "version": "1.80.0",
-      "resolved": "https://registry.npmjs.org/@oxlint/binding-linux-arm-musleabihf/-/binding-linux-arm-musleabihf-1.80.0.tgz",
-      "integrity": "sha512-SvS2uKqzY+pbfuvAHzH4338R6Zwo805GAwrIMVvK1KxoOWCIjZUdfzTCvilD7z6JK91v011+zYMryabhDo2AsQ==",
-      "cpu": [
-        "arm"
-      ],
-      "dev": true,
-      "license": "MIT",
-      "optional": true,
-      "os": [
-        "linux"
-      ],
-      "engines": {
-        "node": "^20.19.0 || >=22.12.0"
-      }
-    },
-    "node_modules/@oxlint/binding-linux-arm64-gnu": {
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-      "resolved": "https://registry.npmjs.org/@oxlint/binding-linux-arm64-gnu/-/binding-linux-arm64-gnu-1.80.0.tgz",
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-      "cpu": [
-        "arm64"
-      ],
-      "dev": true,
-      "libc": [
-        "glibc"
-      ],
-      "license": "MIT",
-      "optional": true,
-      "os": [
-        "linux"
-      ],
-      "engines": {
-        "node": "^20.19.0 || >=22.12.0"
-      }
-    },
-    "node_modules/@oxlint/binding-linux-arm64-musl": {
-      "version": "1.80.0",
-      "resolved": "https://registry.npmjs.org/@oxlint/binding-linux-arm64-musl/-/binding-linux-arm64-musl-1.80.0.tgz",
-      "integrity": "sha512-XfpCNRlOPcLlJl4Bn/FUhjqlR6BVavEykERBf/MV7YA9VZDa5g5znVqYhyviMafcxS9Pe/i/kPvHNO0U6svEHQ==",
-      "cpu": [
-        "arm64"
-      ],
-      "dev": true,
-      "libc": [
-        "musl"
-      ],
-      "license": "MIT",
-      "optional": true,
-      "os": [
-        "linux"
-      ],
-      "engines": {
-        "node": "^20.19.0 || >=22.12.0"
-      }
-    },
-    "node_modules/@oxlint/binding-linux-ppc64-gnu": {
-      "version": "1.80.0",
-      "resolved": "https://registry.npmjs.org/@oxlint/binding-linux-ppc64-gnu/-/binding-linux-ppc64-gnu-1.80.0.tgz",
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-      "cpu": [
-        "ppc64"
-      ],
-      "dev": true,
-      "libc": [
-        "glibc"
-      ],
-      "license": "MIT",
-      "optional": true,
-      "os": [
-        "linux"
-      ],
-      "engines": {
-        "node": "^20.19.0 || >=22.12.0"
-      }
-    },
-    "node_modules/@oxlint/binding-linux-riscv64-gnu": {
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-      "optional": true,
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-      ],
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-    },
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-        "musl"
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-      "license": "MIT",
-      "optional": true,
-      "os": [
-        "linux"
-      ],
-      "engines": {
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-      }
-    },
-    "node_modules/@oxlint/binding-linux-s390x-gnu": {
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-      "license": "MIT",
-      "optional": true,
-      "os": [
-        "linux"
-      ],
-      "engines": {
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-      }
-    },
-    "node_modules/@oxlint/binding-linux-x64-gnu": {
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-      "cpu": [
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-      ],
-      "dev": true,
-      "libc": [
-        "glibc"
-      ],
-      "license": "MIT",
-      "optional": true,
-      "os": [
-        "linux"
-      ],
-      "engines": {
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-      }
-    },
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-      "dev": true,
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-      "license": "MIT",
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-      "os": [
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-      "engines": {
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-      }
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-      },
-      "funding": {
-        "url": "https://github.com/sponsors/Boshen"
-      }
-    },
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-      "dev": true,
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-      "optional": true,
-      "os": [
-        "aix"
-      ],
-      "engines": {
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diff --git a/package.json b/package.json
index fe1e54a..74201ff 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,7 @@
 {
   "name": "@paperkeel/oxlint-plugin-semark",
   "version": "0.1.2",
+  "packageManager": "pnpm@10.33.4",
   "description": "Enforce Semark Protocol signatures and comment rules with Oxlint.",
   "license": "MIT",
   "type": "module",
@@ -19,11 +20,12 @@
   ],
   "scripts": {
     "build": "tsc -p tsconfig.json",
-    "check": "./scripts/check.sh",
+    "check": "pnpm run check:repository && pnpm run build && pnpm run lint && pnpm test",
+    "check:repository": "node scripts/check.mjs",
     "lint": "oxlint --deny-warnings src tests",
-    "prepack": "npm run build",
-    "prepublishOnly": "npm run check",
-    "test": "node --test tests/*.test.mjs"
+    "prepack": "pnpm run build",
+    "prepublishOnly": "pnpm run check",
+    "test": "node --test"
   },
   "dependencies": {
     "@microsoft/tsdoc": "0.16.0",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
new file mode 100644
index 0000000..dbb2a79
--- /dev/null
+++ b/pnpm-lock.yaml
@@ -0,0 +1,475 @@
+lockfileVersion: '9.0'
+
+settings:
+  autoInstallPeers: true
+  excludeLinksFromLockfile: false
+
+importers:
+
+  .:
+    dependencies:
+      '@microsoft/tsdoc':
+        specifier: 0.16.0
+        version: 0.16.0
+      '@oxlint/plugins':
+        specifier: 1.80.0
+        version: 1.80.0
+    devDependencies:
+      '@types/node':
+        specifier: 24.10.1
+        version: 24.10.1
+      oxlint:
+        specifier: 1.80.0
+        version: 1.80.0
+      typescript:
+        specifier: 7.0.2
+        version: 7.0.2
+
+packages:
+
+  '@microsoft/tsdoc@0.16.0':
+    resolution: {integrity: sha512-xgAyonlVVS+q7Vc7qLW0UrJU7rSFcETRWsqdXZtjzRU8dF+6CkozTK4V4y1LwOX7j8r/vHphjDeMeGI4tNGeGA==}
+
+  '@oxlint/binding-android-arm-eabi@1.80.0':
+    resolution: {integrity: sha512-RM3Plj+biQpxa5d1GOOX6ciDlcUROmm4OZ/pLTpitkQt2mJv4jhtY4cbgaetOm5UKWZe05/TGQ6o1Vl8EOHkrA==}
+    engines: {node: ^20.19.0 || >=22.12.0}
+    cpu: [arm]
+    os: [android]
+
+  '@oxlint/binding-android-arm64@1.80.0':
+    resolution: {integrity: sha512-YlO5JEf0Yr2bUUlu8O8daVcUxtcGGbcSmyV7E7nSbJbfAdxTE0PFPwgnIlw7wXJaTYjb+qs5hI5q3jxUkI7cAw==}
+    engines: {node: ^20.19.0 || >=22.12.0}
+    cpu: [arm64]
+    os: [android]
+
+  '@oxlint/binding-darwin-arm64@1.80.0':
+    resolution: {integrity: sha512-BULDOyO3AhsmdWfQeIUCykDt3dd7XZBGLhp1eIh56skRv01O+cNjNPwXMIbeW1x4+pxcln5if72wcRgViVo7PA==}
+    engines: {node: ^20.19.0 || >=22.12.0}
+    cpu: [arm64]
+    os: [darwin]
+
+  '@oxlint/binding-darwin-x64@1.80.0':
+    resolution: {integrity: sha512-YJ4JzLw7N5TDSQFlA0hAQGHvnDZgyypm1yunObVWcWiF9KM7eGCJKYKLgTC2Fi/57OdnBhbj4OkzPGdFQJ6HyA==}
+    engines: {node: ^20.19.0 || >=22.12.0}
+    cpu: [x64]
+    os: [darwin]
+
+  '@oxlint/binding-freebsd-x64@1.80.0':
+    resolution: {integrity: sha512-AYUIk5QnL0s8oWAYsREZwkRYy1SupJTXALo93J1TgzHywxQtdM99FecRMQ87MXEdPQ0j1TmEpeeq3fGNkpvMqg==}
+    engines: {node: ^20.19.0 || >=22.12.0}
+    cpu: [x64]
+    os: [freebsd]
+
+  '@oxlint/binding-linux-arm-gnueabihf@1.80.0':
+    resolution: {integrity: sha512-9hBZVANupQ89W9dXyE0n8doCyaW5pDyGn3y6XlIMPZ+rIKuyqkr3SNUXmVJIhuvUq0NBU3RBiSXXE69l4XI6KA==}
+    engines: {node: ^20.19.0 || >=22.12.0}
+    cpu: [arm]
+    os: [linux]
+
+  '@oxlint/binding-linux-arm-musleabihf@1.80.0':
+    resolution: {integrity: sha512-SvS2uKqzY+pbfuvAHzH4338R6Zwo805GAwrIMVvK1KxoOWCIjZUdfzTCvilD7z6JK91v011+zYMryabhDo2AsQ==}
+    engines: {node: ^20.19.0 || >=22.12.0}
+    cpu: [arm]
+    os: [linux]
+
+  '@oxlint/binding-linux-arm64-gnu@1.80.0':
+    resolution: {integrity: sha512-tCLadyqRVL3pQTRPNg7cjXKvcvS4fbyXeQHhKk5BTJ1oftQln5/yIIWbu/Xom/DX41zv2P9QGt6+D/TtQVtY3A==}
+    engines: {node: ^20.19.0 || >=22.12.0}
+    cpu: [arm64]
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+
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+    resolution: {integrity: sha512-XfpCNRlOPcLlJl4Bn/FUhjqlR6BVavEykERBf/MV7YA9VZDa5g5znVqYhyviMafcxS9Pe/i/kPvHNO0U6svEHQ==}
+    engines: {node: ^20.19.0 || >=22.12.0}
+    cpu: [arm64]
+    os: [linux]
+    libc: [musl]
+
+  '@oxlint/binding-linux-ppc64-gnu@1.80.0':
+    resolution: {integrity: sha512-3I4yMwcFG9NeO8ioY6JBBuKsIm5GL/x7MATt1S4tVWaxPu5HcJ+XnLUbcVBTxG8q2Wu56HSj+NmXQiVYb1lp6A==}
+    engines: {node: ^20.19.0 || >=22.12.0}
+    cpu: [ppc64]
+    os: [linux]
+    libc: [glibc]
+
+  '@oxlint/binding-linux-riscv64-gnu@1.80.0':
+    resolution: {integrity: sha512-E1wAKymkpe1/E8helzBKdm81OBOF+ezxRyXRMEuik3ZpWDER5CPOKZwF66RsdwW98uwZv8UTFremUQtC1CzdJA==}
+    engines: {node: ^20.19.0 || >=22.12.0}
+    cpu: [riscv64]
+    os: [linux]
+    libc: [glibc]
+
+  '@oxlint/binding-linux-riscv64-musl@1.80.0':
+    resolution: {integrity: sha512-+gLRGD4sIo3+VA++iham5UxD9tKSoJ/VOrROCEXIcknrYtQg6iIQgvjN0cpiRF7N6UYC7pJbvHJlDnMge5LRpQ==}
+    engines: {node: ^20.19.0 || >=22.12.0}
+    cpu: [riscv64]
+    os: [linux]
+    libc: [musl]
+
+  '@oxlint/binding-linux-s390x-gnu@1.80.0':
+    resolution: {integrity: sha512-aR0PrzHj9leW3NmzBAAP4EzdoBNoJcs9sjnIQPIwyRnBGYrRbXUIpEB5Q39AqK3PLY5JK5uEhDQDiUa1QSAstw==}
+    engines: {node: ^20.19.0 || >=22.12.0}
+    cpu: [s390x]
+    os: [linux]
+    libc: [glibc]
+
+  '@oxlint/binding-linux-x64-gnu@1.80.0':
+    resolution: {integrity: sha512-vSVh5cSo3Xxs6ghBCcFJlpbkbENzDog1qXtoXLa/HC3aCrR4XO76GZbXmQoCPHnu99nQpdCeC3H9tdNICfDh7A==}
+    engines: {node: ^20.19.0 || >=22.12.0}
+    cpu: [x64]
+    os: [linux]
+    libc: [glibc]
+
+  '@oxlint/binding-linux-x64-musl@1.80.0':
+    resolution: {integrity: sha512-FfzBXpNQ8u7/ZI/p8bl73MeZ508Ax3hxWp3SiJpEFiC+BB9XcXy5FAZHTLKDPSzrUpxQZSZJAVdDmuJp/+HDBQ==}
+    engines: {node: ^20.19.0 || >=22.12.0}
+    cpu: [x64]
+    os: [linux]
+    libc: [musl]
+
+  '@oxlint/binding-openharmony-arm64@1.80.0':
+    resolution: {integrity: sha512-zMzbkumtmprCgRwoYNzcB3iC39fXdJIMLMU33KdCjEGLlJGOEt1+LwQ4LF8ndLzAEKVz4BR0y3V6Xrkk3Nm3yA==}
+    engines: {node: ^20.19.0 || >=22.12.0}
+    cpu: [arm64]
+    os: [openharmony]
+
+  '@oxlint/binding-win32-arm64-msvc@1.80.0':
+    resolution: {integrity: sha512-ib6iRcrXsk4t1fm3iKcwksyWh1ZkZXC/2mEzakl0ai2+6HZunf1WWMZ/xP9EJAvw9g9K4UVTC3NF/+G2qLrbTQ==}
+    engines: {node: ^20.19.0 || >=22.12.0}
+    cpu: [arm64]
+    os: [win32]
+
+  '@oxlint/binding-win32-ia32-msvc@1.80.0':
+    resolution: {integrity: sha512-xhRWBMpLxZvgKAH6+DJZmpP+W8Y8UdQOSU1JfxSWNXsaBaRGW77j+1hCuNHlzj7OH4SPN8fYd1q0o2qrDtoVyw==}
+    engines: {node: ^20.19.0 || >=22.12.0}
+    cpu: [ia32]
+    os: [win32]
+
+  '@oxlint/binding-win32-x64-msvc@1.80.0':
+    resolution: {integrity: sha512-yAnO7lwBYQnz2pcfBPIGQQZWIX5zd5R/1aAKIF3oE+TVj7IhoHcROjOkz3sRDngzqhfPKfFaXqug5j5rE5dn6Q==}
+    engines: {node: ^20.19.0 || >=22.12.0}
+    cpu: [x64]
+    os: [win32]
+
+  '@oxlint/plugins@1.80.0':
+    resolution: {integrity: sha512-QRgH1XqQEYNHa4f1vvPQ5fAdNdncHGIUG1ZWLlGIZHky3qwCEeAKYitZNbZMtaXtAQAAFFTOwqUfzESvimqZNA==}
+    engines: {node: ^12.22.0 || ^14.17.0 || >=16.0.0}
+
+  '@types/node@24.10.1':
+    resolution: {integrity: sha512-GNWcUTRBgIRJD5zj+Tq0fKOJ5XZajIiBroOF0yvj2bSU1WvNdYS/dn9UxwsujGW4JX06dnHyjV2y9rRaybH0iQ==}
+
+  '@typescript/typescript-aix-ppc64@7.0.2':
+    resolution: {integrity: sha512-MTKKkWB7p/0E9xi1d1tHtZ5PiLkGEMIq88pK2CubZjOsLtYTLqhgIgi6zepFa+9GHZ6h05NMCkQxGKiPXMxXtQ==}
+    engines: {node: '>=16.20.0'}
+    cpu: [ppc64]
+    os: [aix]
+
+  '@typescript/typescript-darwin-arm64@7.0.2':
+    resolution: {integrity: sha512-gowzar9MwS/aRWp6f3a4KUqzRjAZjOsmGNCM6LcTgXum+dBfgsBVMN+AgvOCCbguXyick6LJhpBszxMebJ8syA==}
+    engines: {node: '>=16.20.0'}
+    cpu: [arm64]
+    os: [darwin]
+
+  '@typescript/typescript-darwin-x64@7.0.2':
+    resolution: {integrity: sha512-SZ9xZInqApNlNGc9s0W1VSsktYSOe9cFqNOIqmN1Gs8SmkjKZYFt017G4VwPxASInODuAdbTW7sXiFUf893RgA==}
+    engines: {node: '>=16.20.0'}
+    cpu: [x64]
+    os: [darwin]
+
+  '@typescript/typescript-freebsd-arm64@7.0.2':
+    resolution: {integrity: sha512-W5NH4y/J0plIIS5b2xvTEkU7JFxyqdMAOgf+Ilhl0vHQXKO5dZoxd+C/jEtq56c4F3wk71RB4BMRQ2XdI+bwYQ==}
+    engines: {node: '>=16.20.0'}
+    cpu: [arm64]
+    os: [freebsd]
+
+  '@typescript/typescript-freebsd-x64@7.0.2':
+    resolution: {integrity: sha512-UMGDx5sTpzNw3WiPebH7l90IWfJggEd+egHt/q6p7/Cm3zqoV7VxkGXt+3DxPIw8CcmvAB0j3sVVfbhX+M4Tpw==}
+    engines: {node: '>=16.20.0'}
+    cpu: [x64]
+    os: [freebsd]
+
+  '@typescript/typescript-linux-arm64@7.0.2':
+    resolution: {integrity: sha512-Qh4eU4/y3yDjnfjjyPYihMj5/ODIlmt+Bzu17OI+fiSRDW57QmU5SiN63exPRNJPKUzcc1INa1NXdrJ+MqHjUQ==}
+    engines: {node: '>=16.20.0'}
+    cpu: [arm64]
+    os: [linux]
+
+  '@typescript/typescript-linux-arm@7.0.2':
+    resolution: {integrity: sha512-gffT3xPz9sR7j/YJExkyPntrI0P2EP9XbOyWzth2/Gs0RstK+90RBcO0ncXoXy/beYll1SXw846Nf2zdnEz0QQ==}
+    engines: {node: '>=16.20.0'}
+    cpu: [arm]
+    os: [linux]
+
+  '@typescript/typescript-linux-loong64@7.0.2':
+    resolution: {integrity: sha512-uEHck9i8hoAzXPiYRib1O7miOnz23SxIeVl6F4LXox+qov1K35jHcEW6VHKvZI+pyvl7fZEP4MCU5LYvIq1GuQ==}
+    engines: {node: '>=16.20.0'}
+    cpu: [loong64]
+    os: [linux]
+
+  '@typescript/typescript-linux-mips64el@7.0.2':
+    resolution: {integrity: sha512-R4KvAMnE43W5Qeqb0Ly56O3mWMWIAgsMyz36DCaycd5nbg/9kzm0liw3JocfRqyJY0KPmzFjbswozXyW0DnIYA==}
+    engines: {node: '>=16.20.0'}
+    cpu: [mips64el]
+    os: [linux]
+
+  '@typescript/typescript-linux-ppc64@7.0.2':
+    resolution: {integrity: sha512-DORx5b3sd/4S7eayxm4FQv+A7CrkUIGRaHiwI8oiHTAI1fAPWhF4J0vAlkC8biAlHSVVwxMQ3tjZ2/DVbnQiiA==}
+    engines: {node: '>=16.20.0'}
+    cpu: [ppc64]
+    os: [linux]
+
+  '@typescript/typescript-linux-riscv64@7.0.2':
+    resolution: {integrity: sha512-wf0jqEDOjrPRnKwYRyyJDRo11KMbvMFrU+q4zqKyChODBzvlkbhNQfKvLxQCcwTpdDaXSHZTVuh0JoCrKCUMHQ==}
+    engines: {node: '>=16.20.0'}
+    cpu: [riscv64]
+    os: [linux]
+
+  '@typescript/typescript-linux-s390x@7.0.2':
+    resolution: {integrity: sha512-IkwJc3L7yhytWd/ewjyxNDfOmswCm9GWMJT/ue/dU4aZNbwZeYAetq42VyLmsmSjvoX7z74X6ZaYCtzAr0EuGw==}
+    engines: {node: '>=16.20.0'}
+    cpu: [s390x]
+    os: [linux]
+
+  '@typescript/typescript-linux-x64@7.0.2':
+    resolution: {integrity: sha512-EYdf2cNg7rgCWJnxCdJ+F3V39O8ihb37eHAu1LK8oAFizgTQbPOK7zHHXbPt8rX24COqODXeI3sIf0fCXG7H/A==}
+    engines: {node: '>=16.20.0'}
+    cpu: [x64]
+    os: [linux]
+
+  '@typescript/typescript-netbsd-arm64@7.0.2':
+    resolution: {integrity: sha512-+polYF4MF04aPpO5FTkHran9yUQDSXqy5GiSDKpsll5jy3l3+g9QLhpf39T+ePtefhXLOGrLl0QIjkQP6VnelA==}
+    engines: {node: '>=16.20.0'}
+    cpu: [arm64]
+    os: [netbsd]
+
+  '@typescript/typescript-netbsd-x64@7.0.2':
+    resolution: {integrity: sha512-8YIT0EHM/3dq10ZOVF/A7pc/YSMtbcecct4rWtexrnSCHOPcpC2KTLXfTCR6vDpnSiY12heNb1GiN/wu+T/FyA==}
+    engines: {node: '>=16.20.0'}
+    cpu: [x64]
+    os: [netbsd]
+
+  '@typescript/typescript-openbsd-arm64@7.0.2':
+    resolution: {integrity: sha512-APT8+ClYnuYm1u9+kgGXoMj2VzWzcymwh2gNSQVySHfkRDGOTVkoWLjCmOQSaO+PoqQ57B0flRp9SA+7GnnkzQ==}
+    engines: {node: '>=16.20.0'}
+    cpu: [arm64]
+    os: [openbsd]
+
+  '@typescript/typescript-openbsd-x64@7.0.2':
+    resolution: {integrity: sha512-yX7s+Q0Dln0Dt9tEzZsAjXXR/+ytBM7AlglaqyeMPxQszJ1JhlJdZ6jLA+IzldHtflX81em7lDao1xXu+aRRkg==}
+    engines: {node: '>=16.20.0'}
+    cpu: [x64]
+    os: [openbsd]
+
+  '@typescript/typescript-sunos-x64@7.0.2':
+    resolution: {integrity: sha512-dLJDGaLZ1D4HPQn62u1n8mBDkJREwMsAkCdkwd4Ieqw+x3TUyTsqY0YiBCtE6H6OzzgGk3iuZ3vFWRS+E8/d1g==}
+    engines: {node: '>=16.20.0'}
+    cpu: [x64]
+    os: [sunos]
+
+  '@typescript/typescript-win32-arm64@7.0.2':
+    resolution: {integrity: sha512-Gyl1Vy6OsWesLzmq+EP0Fb7b4Nid5232AvcA2SFcdYreldpNtYFFofPjnt62y9hQy7VTaZp65ICJjuAQRaVcIQ==}
+    engines: {node: '>=16.20.0'}
+    cpu: [arm64]
+    os: [win32]
+
+  '@typescript/typescript-win32-x64@7.0.2':
+    resolution: {integrity: sha512-0BQ3HkAHHlKLSp1qRvf3SUhGpGsDuhB/jgFw75guyqbxJqEaS0Cw/VFO8i2nHglJUzQCRtMMR/IBAKE3ETMC4g==}
+    engines: {node: '>=16.20.0'}
+    cpu: [x64]
+    os: [win32]
+
+  oxlint@1.80.0:
+    resolution: {integrity: sha512-5nTiSps4qdbCWLbxzuO00alHkEO2exR9YMN/ig6QXWrLsYSG0KaObOAM+l6oU2LcKPWoSAGYbkZIGEu1ViiWKA==}
+    engines: {node: ^20.19.0 || >=22.12.0}
+    hasBin: true
+    peerDependencies:
+      oxlint-tsgolint: '>=7.0.2001'
+      vite-plus: '*'
+    peerDependenciesMeta:
+      oxlint-tsgolint:
+        optional: true
+      vite-plus:
+        optional: true
+
+  typescript@7.0.2:
+    resolution: {integrity: sha512-8FYau96o3NKOhbjKi/qNvG/W5jhzxkbdm5sj9AbZ/5T5sWqn3hJgLfGx27sRKZWTvyzCP8dLRBTf5tBTSRVUNA==}
+    engines: {node: '>=16.20.0'}
+    hasBin: true
+
+  undici-types@7.16.0:
+    resolution: {integrity: sha512-Zz+aZWSj8LE6zoxD+xrjh4VfkIG8Ya6LvYkZqtUQGJPZjYl53ypCaUwWqo7eI0x66KBGeRo+mlBEkMSeSZ38Nw==}
+
+snapshots:
+
+  '@microsoft/tsdoc@0.16.0': {}
+
+  '@oxlint/binding-android-arm-eabi@1.80.0':
+    optional: true
+
+  '@oxlint/binding-android-arm64@1.80.0':
+    optional: true
+
+  '@oxlint/binding-darwin-arm64@1.80.0':
+    optional: true
+
+  '@oxlint/binding-darwin-x64@1.80.0':
+    optional: true
+
+  '@oxlint/binding-freebsd-x64@1.80.0':
+    optional: true
+
+  '@oxlint/binding-linux-arm-gnueabihf@1.80.0':
+    optional: true
+
+  '@oxlint/binding-linux-arm-musleabihf@1.80.0':
+    optional: true
+
+  '@oxlint/binding-linux-arm64-gnu@1.80.0':
+    optional: true
+
+  '@oxlint/binding-linux-arm64-musl@1.80.0':
+    optional: true
+
+  '@oxlint/binding-linux-ppc64-gnu@1.80.0':
+    optional: true
+
+  '@oxlint/binding-linux-riscv64-gnu@1.80.0':
+    optional: true
+
+  '@oxlint/binding-linux-riscv64-musl@1.80.0':
+    optional: true
+
+  '@oxlint/binding-linux-s390x-gnu@1.80.0':
+    optional: true
+
+  '@oxlint/binding-linux-x64-gnu@1.80.0':
+    optional: true
+
+  '@oxlint/binding-linux-x64-musl@1.80.0':
+    optional: true
+
+  '@oxlint/binding-openharmony-arm64@1.80.0':
+    optional: true
+
+  '@oxlint/binding-win32-arm64-msvc@1.80.0':
+    optional: true
+
+  '@oxlint/binding-win32-ia32-msvc@1.80.0':
+    optional: true
+
+  '@oxlint/binding-win32-x64-msvc@1.80.0':
+    optional: true
+
+  '@oxlint/plugins@1.80.0': {}
+
+  '@types/node@24.10.1':
+    dependencies:
+      undici-types: 7.16.0
+
+  '@typescript/typescript-aix-ppc64@7.0.2':
+    optional: true
+
+  '@typescript/typescript-darwin-arm64@7.0.2':
+    optional: true
+
+  '@typescript/typescript-darwin-x64@7.0.2':
+    optional: true
+
+  '@typescript/typescript-freebsd-arm64@7.0.2':
+    optional: true
+
+  '@typescript/typescript-freebsd-x64@7.0.2':
+    optional: true
+
+  '@typescript/typescript-linux-arm64@7.0.2':
+    optional: true
+
+  '@typescript/typescript-linux-arm@7.0.2':
+    optional: true
+
+  '@typescript/typescript-linux-loong64@7.0.2':
+    optional: true
+
+  '@typescript/typescript-linux-mips64el@7.0.2':
+    optional: true
+
+  '@typescript/typescript-linux-ppc64@7.0.2':
+    optional: true
+
+  '@typescript/typescript-linux-riscv64@7.0.2':
+    optional: true
+
+  '@typescript/typescript-linux-s390x@7.0.2':
+    optional: true
+
+  '@typescript/typescript-linux-x64@7.0.2':
+    optional: true
+
+  '@typescript/typescript-netbsd-arm64@7.0.2':
+    optional: true
+
+  '@typescript/typescript-netbsd-x64@7.0.2':
+    optional: true
+
+  '@typescript/typescript-openbsd-arm64@7.0.2':
+    optional: true
+
+  '@typescript/typescript-openbsd-x64@7.0.2':
+    optional: true
+
+  '@typescript/typescript-sunos-x64@7.0.2':
+    optional: true
+
+  '@typescript/typescript-win32-arm64@7.0.2':
+    optional: true
+
+  '@typescript/typescript-win32-x64@7.0.2':
+    optional: true
+
+  oxlint@1.80.0:
+    optionalDependencies:
+      '@oxlint/binding-android-arm-eabi': 1.80.0
+      '@oxlint/binding-android-arm64': 1.80.0
+      '@oxlint/binding-darwin-arm64': 1.80.0
+      '@oxlint/binding-darwin-x64': 1.80.0
+      '@oxlint/binding-freebsd-x64': 1.80.0
+      '@oxlint/binding-linux-arm-gnueabihf': 1.80.0
+      '@oxlint/binding-linux-arm-musleabihf': 1.80.0
+      '@oxlint/binding-linux-arm64-gnu': 1.80.0
+      '@oxlint/binding-linux-arm64-musl': 1.80.0
+      '@oxlint/binding-linux-ppc64-gnu': 1.80.0
+      '@oxlint/binding-linux-riscv64-gnu': 1.80.0
+      '@oxlint/binding-linux-riscv64-musl': 1.80.0
+      '@oxlint/binding-linux-s390x-gnu': 1.80.0
+      '@oxlint/binding-linux-x64-gnu': 1.80.0
+      '@oxlint/binding-linux-x64-musl': 1.80.0
+      '@oxlint/binding-openharmony-arm64': 1.80.0
+      '@oxlint/binding-win32-arm64-msvc': 1.80.0
+      '@oxlint/binding-win32-ia32-msvc': 1.80.0
+      '@oxlint/binding-win32-x64-msvc': 1.80.0
+
+  typescript@7.0.2:
+    optionalDependencies:
+      '@typescript/typescript-aix-ppc64': 7.0.2
+      '@typescript/typescript-darwin-arm64': 7.0.2
+      '@typescript/typescript-darwin-x64': 7.0.2
+      '@typescript/typescript-freebsd-arm64': 7.0.2
+      '@typescript/typescript-freebsd-x64': 7.0.2
+      '@typescript/typescript-linux-arm': 7.0.2
+      '@typescript/typescript-linux-arm64': 7.0.2
+      '@typescript/typescript-linux-loong64': 7.0.2
+      '@typescript/typescript-linux-mips64el': 7.0.2
+      '@typescript/typescript-linux-ppc64': 7.0.2
+      '@typescript/typescript-linux-riscv64': 7.0.2
+      '@typescript/typescript-linux-s390x': 7.0.2
+      '@typescript/typescript-linux-x64': 7.0.2
+      '@typescript/typescript-netbsd-arm64': 7.0.2
+      '@typescript/typescript-netbsd-x64': 7.0.2
+      '@typescript/typescript-openbsd-arm64': 7.0.2
+      '@typescript/typescript-openbsd-x64': 7.0.2
+      '@typescript/typescript-sunos-x64': 7.0.2
+      '@typescript/typescript-win32-arm64': 7.0.2
+      '@typescript/typescript-win32-x64': 7.0.2
+
+  undici-types@7.16.0: {}
diff --git a/scripts/check.mjs b/scripts/check.mjs
new file mode 100644
index 0000000..490f507
--- /dev/null
+++ b/scripts/check.mjs
@@ -0,0 +1,214 @@
+import { spawnSync } from "node:child_process";
+import { lstat, readFile, readdir, readlink } from "node:fs/promises";
+import { homedir } from "node:os";
+import { dirname, join, normalize, relative, resolve, sep } from "node:path";
+import { fileURLToPath } from "node:url";
+
+const scriptPath = fileURLToPath(import.meta.url);
+const repositoryRoot = dirname(dirname(scriptPath));
+const skills = ["semark-protocol"];
+
+function displayPath(root, path) {
+  return relative(root, path).split(sep).join("/");
+}
+
+async function pathExists(path) {
+  try {
+    await lstat(path);
+    return true;
+  } catch (error) {
+    if (error?.code === "ENOENT") {
+      return false;
+    }
+
+    throw error;
+  }
+}
+
+export async function validateRequiredSymlink(
+  root,
+  relativePath,
+  expectedTarget,
+) {
+  const path = join(root, relativePath);
+  let metadata;
+
+  try {
+    metadata = await lstat(path);
+  } catch (error) {
+    if (error?.code === "ENOENT") {
+      throw new Error(`${relativePath} must be a symbolic link to ${expectedTarget}.`);
+    }
+
+    throw error;
+  }
+
+  if (!metadata.isSymbolicLink()) {
+    throw new Error(`${relativePath} must be a symbolic link to ${expectedTarget}.`);
+  }
+
+  const target = await readlink(path);
+  if (normalize(target) !== normalize(expectedTarget)) {
+    throw new Error(`${relativePath} must link to ${expectedTarget}.`);
+  }
+}
+
+async function collectFiles(path) {
+  const metadata = await lstat(path);
+  if (!metadata.isDirectory()) {
+    return [path];
+  }
+
+  const entries = await readdir(path);
+  const files = [];
+
+  for (const entry of entries) {
+    files.push(...(await collectFiles(join(path, entry))));
+  }
+
+  return files;
+}
+
+export async function findPlaceholders(root, paths) {
+  const matches = [];
+
+  for (const path of paths) {
+    for (const filePath of await collectFiles(join(root, path))) {
+      const lines = (await readFile(filePath, "utf8")).split(/\r?\n/u);
+
+      for (const [index, line] of lines.entries()) {
+        if (/\[TODO|TODO:/u.test(line)) {
+          matches.push({
+            line,
+            lineNumber: index + 1,
+            path: displayPath(root, filePath),
+          });
+        }
+      }
+    }
+  }
+
+  return matches;
+}
+
+function pythonLaunchers() {
+  if (process.platform === "win32") {
+    return [
+      { args: ["-3"], command: "py" },
+      { args: [], command: "python" },
+      { args: [], command: "python3" },
+    ];
+  }
+
+  return [
+    { args: [], command: "python3" },
+    { args: [], command: "python" },
+    { args: ["-3"], command: "py" },
+  ];
+}
+
+function findPython3() {
+  for (const launcher of pythonLaunchers()) {
+    const result = spawnSync(
+      launcher.command,
+      [
+        ...launcher.args,
+        "-c",
+        "import sys; raise SystemExit(sys.version_info.major != 3)",
+      ],
+      { stdio: "ignore" },
+    );
+
+    if (!result.error && result.status === 0) {
+      return launcher;
+    }
+
+    if (result.error && result.error.code !== "ENOENT") {
+      throw result.error;
+    }
+  }
+
+  throw new Error("The skill creator validator requires Python 3.");
+}
+
+function runSkillValidator(validatorPath, skillPath) {
+  const launcher = findPython3();
+  const result = spawnSync(
+    launcher.command,
+    [...launcher.args, validatorPath, skillPath],
+    { stdio: "inherit" },
+  );
+
+  if (result.error) {
+    throw result.error;
+  }
+
+  if (result.status !== 0) {
+    throw new Error(
+      `The skill creator validator failed with status ${result.status}.`,
+    );
+  }
+}
+
+async function validateSkill(root, skillCreatorRoot, skill) {
+  const skillPath = join(root, ".agents", "skills", skill);
+  const skillFilePath = join(skillPath, "SKILL.md");
+
+  if (!(await pathExists(skillFilePath))) {
+    throw new Error(`The ${skill} skill needs SKILL.md.`);
+  }
+
+  const skillFile = await readFile(skillFilePath, "utf8");
+  if (!skillFile.split(/\r?\n/u).includes(`name: ${skill}`)) {
+    throw new Error(`The ${skill} frontmatter name is incorrect.`);
+  }
+
+  const validatorPath = join(skillCreatorRoot, "scripts", "quick_validate.py");
+  if (await pathExists(validatorPath)) {
+    runSkillValidator(validatorPath, skillPath);
+  }
+}
+
+export async function checkRepository(root = repositoryRoot) {
+  await validateRequiredSymlink(root, "CLAUDE.md", "AGENTS.md");
+  await validateRequiredSymlink(
+    root,
+    join(".claude", "skills"),
+    join("..", ".agents", "skills"),
+  );
+
+  const placeholders = await findPlaceholders(root, [
+    "README.md",
+    "AGENTS.md",
+    join(".agents", "skills"),
+  ]);
+
+  if (placeholders.length > 0) {
+    for (const match of placeholders) {
+      console.error(`${match.path}:${match.lineNumber}:${match.line}`);
+    }
+
+    throw new Error("Remove all scaffold placeholders.");
+  }
+
+  const skillCreatorRoot = join(
+    process.env.CODEX_HOME ?? join(homedir(), ".codex"),
+    "skills",
+    ".system",
+    "skill-creator",
+  );
+
+  for (const skill of skills) {
+    await validateSkill(root, skillCreatorRoot, skill);
+  }
+}
+
+if (process.argv[1] && resolve(process.argv[1]) === scriptPath) {
+  try {
+    await checkRepository();
+    console.log("Repository structure checks passed.");
+  } catch (error) {
+    console.error(error instanceof Error ? error.message : error);
+    process.exitCode = 1;
+  }
+}
diff --git a/scripts/check.sh b/scripts/check.sh
deleted file mode 100755
index 1369417..0000000
--- a/scripts/check.sh
+++ /dev/null
@@ -1,52 +0,0 @@
-#!/usr/bin/env bash
-
-set -euo pipefail
-
-repository_root="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
-skill_creator_root="${CODEX_HOME:-$HOME/.codex}/skills/.system/skill-creator"
-skills=(
-	semark-protocol
-)
-
-cd "$repository_root"
-
-if [[ ! -L CLAUDE.md || "$(readlink CLAUDE.md)" != "AGENTS.md" ]]; then
-	echo "CLAUDE.md must link to AGENTS.md." >&2
-	exit 1
-fi
-
-if [[ ! -L .claude/skills || "$(readlink .claude/skills)" != "../.agents/skills" ]]; then
-	echo ".claude/skills must link to ../.agents/skills." >&2
-	exit 1
-fi
-
-if grep -RInE '\[TODO|TODO:' README.md AGENTS.md .agents/skills; then
-	echo "Remove all scaffold placeholders." >&2
-	exit 1
-fi
-
-for skill in "${skills[@]}"; do
-	skill_path=".agents/skills/$skill"
-
-	if [[ ! -f "$skill_path/SKILL.md" ]]; then
-		echo "The $skill skill needs SKILL.md." >&2
-		exit 1
-	fi
-
-	if ! grep -qFx "name: $skill" "$skill_path/SKILL.md"; then
-		echo "The $skill frontmatter name is incorrect." >&2
-		exit 1
-	fi
-
-	if [[ -f "$skill_creator_root/scripts/quick_validate.py" ]]; then
-		python3 "$skill_creator_root/scripts/quick_validate.py" "$skill_path"
-	fi
-done
-
-if [[ -f package.json ]]; then
-	npm run build
-	npm run lint
-	npm test
-fi
-
-echo "All repository checks passed."
diff --git a/tests/check-script.test.mjs b/tests/check-script.test.mjs
new file mode 100644
index 0000000..9850f89
--- /dev/null
+++ b/tests/check-script.test.mjs
@@ -0,0 +1,53 @@
+import assert from "node:assert/strict";
+import { mkdtemp, rm, writeFile } from "node:fs/promises";
+import { tmpdir } from "node:os";
+import { dirname, join } from "node:path";
+import { fileURLToPath } from "node:url";
+import test from "node:test";
+
+import {
+  findPlaceholders,
+  validateRequiredSymlink,
+} from "../scripts/check.mjs";
+
+const repositoryRoot = dirname(dirname(fileURLToPath(import.meta.url)));
+
+test("accepts the repository symbolic links", async () => {
+  await validateRequiredSymlink(repositoryRoot, "CLAUDE.md", "AGENTS.md");
+  await validateRequiredSymlink(
+    repositoryRoot,
+    join(".claude", "skills"),
+    join("..", ".agents", "skills"),
+  );
+});
+
+test("rejects a regular file in place of a symbolic link", async () => {
+  const directory = await mkdtemp(join(tmpdir(), "semark-check-"));
+
+  try {
+    await writeFile(join(directory, "CLAUDE.md"), "AGENTS.md");
+    await assert.rejects(
+      validateRequiredSymlink(directory, "CLAUDE.md", "AGENTS.md"),
+      /must be a symbolic link/u,
+    );
+  } finally {
+    await rm(directory, { recursive: true, force: true });
+  }
+});
+
+test("reports scaffold placeholders with source locations", async () => {
+  const directory = await mkdtemp(join(tmpdir(), "semark-check-"));
+
+  try {
+    await writeFile(join(directory, "README.md"), "Ready.\nTODO: replace me.\n");
+    assert.deepEqual(await findPlaceholders(directory, ["README.md"]), [
+      {
+        line: "TODO: replace me.",
+        lineNumber: 2,
+        path: "README.md",
+      },
+    ]);
+  } finally {
+    await rm(directory, { recursive: true, force: true });
+  }
+});
diff --git a/tests/oxlint-integration.test.mjs b/tests/oxlint-integration.test.mjs
index 5ddba1c..ef6ffa9 100644
--- a/tests/oxlint-integration.test.mjs
+++ b/tests/oxlint-integration.test.mjs
@@ -7,7 +7,8 @@ import { spawnSync } from "node:child_process";
 import test from "node:test";
 
 const repositoryRoot = dirname(dirname(fileURLToPath(import.meta.url)));
-const oxlintPath = join(repositoryRoot, "node_modules", ".bin", "oxlint");
+const oxlintPackagePath = fileURLToPath(import.meta.resolve("oxlint/package.json"));
+const oxlintPath = join(dirname(oxlintPackagePath), "bin", "oxlint");
 const pluginPath = join(repositoryRoot, "dist", "index.js");
 
 async function createConsumer(source, filename = "source.ts") {
@@ -30,10 +31,17 @@ async function createConsumer(source, filename = "source.ts") {
 }
 
 function runOxlint(consumer) {
-  return spawnSync(oxlintPath, ["-c", consumer.configPath, consumer.sourcePath], {
-    cwd: consumer.directory,
-    encoding: "utf8",
-  });
+  const result = spawnSync(
+    process.execPath,
+    [oxlintPath, "-c", consumer.configPath, consumer.sourcePath],
+    {
+      cwd: consumer.directory,
+      encoding: "utf8",
+    },
+  );
+
+  assert.ifError(result.error);
+  return result;
 }
 
 const validSource = `/**