diff --git a/.github/workflows/all_green_check.yaml b/.github/workflows/all_green_check.yaml
index 12eb358a..5f8bf92b 100644
--- a/.github/workflows/all_green_check.yaml
+++ b/.github/workflows/all_green_check.yaml
@@ -20,6 +20,10 @@ on: # yamllint disable-line rule:truthy
       - stable-*
 
 jobs:
+  security-check:
+    if: github.event_name == 'pull_request'
+    uses: ./.github/workflows/security-check.yaml
+
   linters:
     if: github.event_name == 'pull_request'
     uses: ./.github/workflows/linters.yaml
@@ -68,6 +72,7 @@ jobs:
   all_green:
     if: ${{ always() }}
     needs:
+      - security-check
       - linters
       - sanity
       - units
@@ -78,8 +83,9 @@ jobs:
           python -c "
           required = ['sanity', 'units', 'coverage']
           if '${{ github.event_name }}' == 'pull_request':
-              required = ['linters', 'sanity', 'units', 'coverage']
+              required = ['security-check', 'linters', 'sanity', 'units', 'coverage']
           results = {
+              'security-check': '${{ needs.security-check.result }}',
               'linters': '${{ needs.linters.result }}',
               'sanity': '${{ needs.sanity.result }}',
               'units': '${{ needs.units.result }}',
diff --git a/.github/workflows/security-check.yaml b/.github/workflows/security-check.yaml
new file mode 100644
index 00000000..3b5d2004
--- /dev/null
+++ b/.github/workflows/security-check.yaml
@@ -0,0 +1,17 @@
+---
+name: Security Check
+
+on: [workflow_call]
+
+jobs:
+  security-check:
+    name: Block unsafe directories
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Check for blocked directories
+        uses: ansible/cloud-content-ci-automation/.github/actions/security_check_directories@74b5fe870e1d5346c5fcea332b97a6fb26f1ad8a
diff --git a/changelogs/fragments/1173-security-check-workflow.yml b/changelogs/fragments/1173-security-check-workflow.yml
new file mode 100644
index 00000000..d3a3c946
--- /dev/null
+++ b/changelogs/fragments/1173-security-check-workflow.yml
@@ -0,0 +1,2 @@
+trivial:
+  - ci - add security check workflow to block PRs containing ``.claude/`` or ``.vscode/`` directories (https://github.com/ansible-collections/kubernetes.core/pull/1173).
diff --git a/sonar-project.properties b/sonar-project.properties
index 58ee1f14..5e1f064d 100644
--- a/sonar-project.properties
+++ b/sonar-project.properties
@@ -17,7 +17,7 @@ sonar.exclusions=tests/**,.tox/**
 # constructor (not {...} literals) for readability and consistency across the
 # collection. Suppress python:S7498 ("prefer literal syntax"), which conflicts
 # with that convention and otherwise re-fires on every new module argument.
-sonar.issue.ignore.multicriteria=e1,e2
+sonar.issue.ignore.multicriteria=e1,e2,e3
 sonar.issue.ignore.multicriteria.e1.ruleKey=python:S7498
 sonar.issue.ignore.multicriteria.e1.resourceKey=**/*.py
 
@@ -28,3 +28,9 @@ sonar.issue.ignore.multicriteria.e1.resourceKey=**/*.py
 # NamedTemporaryFile and stays covered by the rule.
 sonar.issue.ignore.multicriteria.e2.ruleKey=python:S5443
 sonar.issue.ignore.multicriteria.e2.resourceKey=tests/**/*.py
+
+# GitHub Actions workflows in this repo use @main for internal reusable actions
+# (ansible-network/github_actions, ansible-collections/cloud-content-ci-automation)
+# to simplify maintenance. Suppress githubactions:S7637 ("use full commit SHA").
+sonar.issue.ignore.multicriteria.e3.ruleKey=githubactions:S7637
+sonar.issue.ignore.multicriteria.e3.resourceKey=.github/workflows/**/*.yaml