diff --git a/.github/workflows/codex-pr-review.yml b/.github/workflows/codex-pr-review.yml
new file mode 100644
index 00000000..140f2b7f
--- /dev/null
+++ b/.github/workflows/codex-pr-review.yml
@@ -0,0 +1,70 @@
+name: Codex PR Review
+
+on:
+  pull_request:
+    types: [opened]
+
+jobs:
+  codex:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    outputs:
+      final_message: ${{ steps.run_codex.outputs['final-message'] }}
+    environment: CODEX
+    name: Codex PR Review
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v5
+        with:
+          ref: refs/pull/${{ github.event.pull_request.number }}/merge
+
+      - name: Pre-fetch base and head refs for the PR
+        run: |
+          git fetch --no-tags origin \
+            ${{ github.event.pull_request.base.ref }} \
+            +refs/pull/${{ github.event.pull_request.number }}/head
+
+      - name: Run Codex
+        id: run_codex
+        uses: hewenyu/codex-action@crs
+        with:
+          crs-api-key: ${{ secrets.CRS_API_KEY }}
+          crs-base-url: ${{ secrets.CRS_API_BASE_URL }}
+          crs-model: "gpt-5-codex"
+          crs-reasoning-effort: "high"
+          prompt: |
+            This is PR #${{ github.event.pull_request.number }} for ${{ github.repository }}.
+            Base SHA: ${{ github.event.pull_request.base.sha }}
+            Head SHA: ${{ github.event.pull_request.head.sha }}
+
+            Review ONLY the changes introduced by the PR.
+            Suggest any improvements, potential bugs, or issues.
+            Be concise and specific in your feedback.
+
+            Pull request title and body:
+            ----
+            ${{ github.event.pull_request.title }}
+            ${{ github.event.pull_request.body }}
+
+  post_feedback:
+    runs-on: ubuntu-latest
+    needs: codex
+    if: needs.codex.outputs.final_message != ''
+    permissions:
+      issues: write
+      pull-requests: write
+    steps:
+      - name: Report Codex feedback
+        uses: actions/github-script@v7
+        env:
+          CODEX_FINAL_MESSAGE: ${{ needs.codex.outputs.final_message }}
+        with:
+          github-token: ${{ github.token }}
+          script: |
+            await github.rest.issues.createComment({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: context.payload.pull_request.number,
+              body: process.env.CODEX_FINAL_MESSAGE,
+            });