diff --git a/.github/workflows/validate.yml b/.github/workflows/validate.yml
index 3ad4de5..1dbc746 100644
--- a/.github/workflows/validate.yml
+++ b/.github/workflows/validate.yml
@@ -13,11 +13,18 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 22
       - uses: actions/setup-python@v5
         with:
           python-version: "3.12"
       - name: Check package files
         run: python3 scripts/validate-package.py
+      - name: Check Claude plugin manifest
+        run: |
+          npm install --global @anthropic-ai/claude-code
+          claude plugin validate .
       - name: Check server script starts and serves
         run: |
           set -e