diff --git a/.github/workflows/check_private_index.yml b/.github/workflows/check_private_index.yml
new file mode 100644
index 000000000..25931889a
--- /dev/null
+++ b/.github/workflows/check_private_index.yml
@@ -0,0 +1,43 @@
+# Copyright 2025 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: Check for Private Index URLs in uv.lock
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  check-for-private-index:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+      - name: Search for private index URL in uv.lock files
+        run: |
+          FORBIDDEN_URL="us-python.pkg.dev"
+          FOUND_FILES=$(find . -type f -name "uv.lock" -print)
+          if [ -n "$FOUND_FILES" ]; then
+            # Use grep and check its exit code. grep exits with 0 if a match is found.
+            if echo "$FOUND_FILES" | xargs grep -q "$FORBIDDEN_URL"; then
+              echo "::error::Found private index URL ($FORBIDDEN_URL) in the following uv.lock files:"
+              # Show which files contain the URL
+              echo "$FOUND_FILES" | xargs grep -H "$FORBIDDEN_URL"
+              exit 1
+            else
+              echo "No private index URLs found in uv.lock files."
+            fi
+          else
+            echo "No uv.lock files found to check."
+          fi
\ No newline at end of file
diff --git a/a2a_agents/python/a2ui_extension/uv.lock b/a2a_agents/python/a2ui_extension/uv.lock
index ef835190b..b344fc398 100644
--- a/a2a_agents/python/a2ui_extension/uv.lock
+++ b/a2a_agents/python/a2ui_extension/uv.lock
@@ -6,6 +6,10 @@ resolution-markers = [
     "python_full_version < '3.13'",
 ]
 
+# Test line for private index
+some_package == 1.0; index = "https://us-python.pkg.dev/fake/simple"
+
+
 [[package]]
 name = "a2a-sdk"
 version = "0.3.22"