diff --git a/packages/omo-codex/plugin/components/comment-checker/LICENSE b/packages/omo-codex/plugin/components/comment-checker/LICENSE
new file mode 100644
index 000000000..09aac3c3b
--- /dev/null
+++ b/packages/omo-codex/plugin/components/comment-checker/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 Yeongyu Kim
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/packages/omo-codex/plugin/components/comment-checker/NOTICE b/packages/omo-codex/plugin/components/comment-checker/NOTICE
new file mode 100644
index 000000000..5b363ec20
--- /dev/null
+++ b/packages/omo-codex/plugin/components/comment-checker/NOTICE
@@ -0,0 +1,6 @@
+codex-comment-checker
+
+This package ports the pi-comment-checker hook into a Codex plugin repository.
+
+The plugin targets Codex plugin manifests and plugin-bundled lifecycle hooks.
+The checker engine is provided by @code-yeongyu/comment-checker.
diff --git a/packages/omo-codex/plugin/components/comment-checker/README.md b/packages/omo-codex/plugin/components/comment-checker/README.md
new file mode 100644
index 000000000..d48d38f80
--- /dev/null
+++ b/packages/omo-codex/plugin/components/comment-checker/README.md
@@ -0,0 +1,87 @@
+# codex-comment-checker
+
+[![ci](https://github.com/code-yeongyu/codex-comment-checker/actions/workflows/ci.yml/badge.svg)](https://github.com/code-yeongyu/codex-comment-checker/actions/workflows/ci.yml) [![license: MIT](https://img.shields.io/badge/license-MIT-blue.svg)](LICENSE)
+
+Codex plugin that runs [`@code-yeongyu/comment-checker`](https://github.com/code-yeongyu/go-claude-code-comment-checker) after successful edit-like `PostToolUse` hook calls.
+
+## Behavior
+
+| Case | Result |
+|------|--------|
+| `apply_patch` succeeds | parses `tool_input.command` and checks added/updated files |
+| `write`, `edit`, `multi_edit`, or `multiedit` succeeds | maps the Codex payload to the native checker hook input |
+| non-edit tool succeeds | ignored |
+| checker exits `2` | returns Codex `PostToolUse` blocking feedback so the model fixes or explains the warning |
+| checker binary missing or unavailable on the current platform | emits no hook output |
+| checker exits unexpectedly | leaves hook output unchanged |
+
+Deletes are ignored because they cannot introduce new comments.
+
+## Codex Plugin
+
+The plugin ships:
+
+- `.codex-plugin/plugin.json` for Codex plugin discovery.
+- `hooks/hooks.json` for the `PostToolUse` hook.
+- `skills/comment-checker/SKILL.md` with usage guidance.
+
+The hook command is:
+
+```bash
+node "${PLUGIN_ROOT}/dist/cli.js" hook post-tool-use
+```
+
+No MCP server or `comment_check` tool is exposed.
+
+## Local Development
+
+```bash
+npm install
+npm test
+npm run typecheck
+npm run check
+npm pack --dry-run
+```
+
+Smoke-test the hook:
+
+```bash
+node dist/cli.js hook post-tool-use < test/fixtures/post-tool-use.json
+```
+
+## Local Codex Installation
+
+```bash
+bunx lazycodex install
+```
+
+The installer builds and copies the plugin into `~/.codex/plugins/cache/sisyphuslabs/omo/0.1.0`, registers the `sisyphuslabs` marketplace from the `lazycodex` Git repository, installs runtime dependencies there, and enables:
+
+```toml
+[features]
+plugins = true
+plugin_hooks = true
+
+[plugins."omo@sisyphuslabs"]
+enabled = true
+```
+
+## Branch Rules and Releases
+
+- `main` is protected by `.github/branch-ruleset.json`.
+- CI runs Node 20 and 22 on Ubuntu, macOS, and Windows.
+- Releases are GitHub Releases tagged as `v<semver>`.
+- Publishing runs from the `publish` workflow after a GitHub Release is published.
+
+## Privacy
+
+This plugin runs locally. It sends hook input to the optional local `comment-checker` binary when available and does not call a network service by itself.
+
+## License
+
+[MIT](LICENSE).
+
+## Related
+
+- [pi-comment-checker](https://github.com/code-yeongyu/pi-comment-checker) - source extension this Codex plugin ports.
+- [comment-checker](https://github.com/code-yeongyu/go-claude-code-comment-checker) - native checker binary.
diff --git a/packages/omo-codex/plugin/components/comment-checker/package.json b/packages/omo-codex/plugin/components/comment-checker/package.json
new file mode 100644
index 000000000..6fa96b416
--- /dev/null
+++ b/packages/omo-codex/plugin/components/comment-checker/package.json
@@ -0,0 +1,57 @@
+{
+	"name": "@code-yeongyu/codex-comment-checker",
+	"version": "0.1.1",
+	"description": "Codex plugin that runs comment-checker after edit-like PostToolUse hooks.",
+	"type": "module",
+	"packageManager": "npm@11.12.1",
+	"license": "MIT",
+	"homepage": "https://github.com/code-yeongyu/codex-comment-checker",
+	"repository": {
+		"type": "git",
+		"url": "git+https://github.com/code-yeongyu/codex-comment-checker.git"
+	},
+	"bugs": {
+		"url": "https://github.com/code-yeongyu/codex-comment-checker/issues"
+	},
+	"keywords": [
+		"codex",
+		"codex-plugin",
+		"comment-checker",
+		"hooks",
+		"typescript"
+	],
+	"bin": {
+		"omo-comment-checker": "./dist/cli.js"
+	},
+	"files": [
+		"dist",
+		"hooks",
+		"skills",
+		".codex-plugin",
+		"LICENSE",
+		"NOTICE",
+		"README.md",
+		"CHANGELOG.md"
+	],
+	"scripts": {
+		"build": "tsc -p tsconfig.build.json",
+		"test": "vitest --run",
+		"test:watch": "vitest",
+		"typecheck": "tsc --noEmit",
+		"lint": "biome check .",
+		"lint:fix": "biome check --write .",
+		"check": "tsc --noEmit && biome check . && npm run build"
+	},
+	"optionalDependencies": {
+		"@code-yeongyu/comment-checker": "^0.8.0"
+	},
+	"devDependencies": {
+		"@biomejs/biome": "2.4.15",
+		"@types/node": "^25.7.0",
+		"typescript": "^6.0.3",
+		"vitest": "^4.1.5"
+	},
+	"engines": {
+		"node": ">=20.0.0"
+	}
+}
diff --git a/packages/omo-codex/plugin/components/comment-checker/tsconfig.build.json b/packages/omo-codex/plugin/components/comment-checker/tsconfig.build.json
new file mode 100644
index 000000000..5b5bbcafd
--- /dev/null
+++ b/packages/omo-codex/plugin/components/comment-checker/tsconfig.build.json
@@ -0,0 +1,12 @@
+{
+	"extends": "./tsconfig.json",
+	"compilerOptions": {
+		"allowImportingTsExtensions": false,
+		"declaration": true,
+		"outDir": "dist",
+		"rootDir": "src",
+		"noEmit": false
+	},
+	"include": ["src/**/*"],
+	"exclude": ["test/**/*"]
+}
diff --git a/packages/omo-codex/plugin/components/comment-checker/tsconfig.json b/packages/omo-codex/plugin/components/comment-checker/tsconfig.json
new file mode 100644
index 000000000..342229c02
--- /dev/null
+++ b/packages/omo-codex/plugin/components/comment-checker/tsconfig.json
@@ -0,0 +1,27 @@
+{
+	"compilerOptions": {
+		"target": "ES2022",
+		"module": "Node16",
+		"moduleResolution": "Node16",
+		"lib": ["ES2022"],
+		"strict": true,
+		"exactOptionalPropertyTypes": true,
+		"noUncheckedIndexedAccess": true,
+		"noPropertyAccessFromIndexSignature": true,
+		"verbatimModuleSyntax": true,
+		"noImplicitOverride": true,
+		"noImplicitReturns": true,
+		"noFallthroughCasesInSwitch": true,
+		"noUnusedLocals": true,
+		"noUnusedParameters": true,
+		"esModuleInterop": true,
+		"allowImportingTsExtensions": true,
+		"skipLibCheck": true,
+		"forceConsistentCasingInFileNames": true,
+		"resolveJsonModule": true,
+		"useDefineForClassFields": false,
+		"types": ["node"],
+		"noEmit": true
+	},
+	"include": ["src/**/*", "test/**/*"]
+}
diff --git a/packages/omo-codex/plugin/components/comment-checker/vitest.config.ts b/packages/omo-codex/plugin/components/comment-checker/vitest.config.ts
new file mode 100644
index 000000000..57bd8f12b
--- /dev/null
+++ b/packages/omo-codex/plugin/components/comment-checker/vitest.config.ts
@@ -0,0 +1,9 @@
+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+	test: {
+		include: ["test/**/*.test.ts"],
+		environment: "node",
+		pool: "threads",
+	},
+});