diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6aa76bb..46eab7b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -50,6 +50,10 @@ jobs:
           version: "0.11.30"
           enable-cache: true
       - run: uv sync --locked --only-dev
+      - run: >-
+          uvx --from
+          git+https://github.com/agentskills/agentskills.git@69ef37e9424c0a7ea9dd2293b559e43ec8176379#subdirectory=skills-ref
+          skills-ref validate skills/py-review
       - run: uv run --no-sync ruff check .
       - run: python3 .github/scripts/check-portability.py
       - run: python3 scripts/validate.py
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index fec286d..4b824ac 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -28,6 +28,7 @@ From the repository root:
 
 ```bash
 uv sync --locked --only-dev
+uvx --from git+https://github.com/agentskills/agentskills.git@69ef37e9424c0a7ea9dd2293b559e43ec8176379#subdirectory=skills-ref skills-ref validate skills/py-review
 uv run ruff check .
 python3 .github/scripts/check-portability.py
 python3 scripts/validate.py