diff --git a/.github/workflows/assign-copilot-reviewer.yml b/.github/workflows/assign-copilot-reviewer.yml
new file mode 100644
index 000000000..4fb2d49e1
--- /dev/null
+++ b/.github/workflows/assign-copilot-reviewer.yml
@@ -0,0 +1,25 @@
+name: Assign Copilot as reviewer
+
+on:
+  pull_request_target:
+    types:
+      - ready_for_review
+
+permissions:
+  contents: read
+
+jobs:
+  assign-copilot:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Assign Copilot as reviewer
+        uses: actions/github-script@v7
+        with:
+          github-token: ${{ secrets.COPILOT_ASSIGNING_PAT }}
+          script: |
+            await github.rest.pulls.requestReviewers({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              pull_number: context.payload.pull_request.number,
+              reviewers: ['copilot-swe-agent']
+            });