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+# no-jinja-when
+
+This rule checks conditional statements for Jinja expressions in curly brackets `{{ }}`.
+Ansible processes conditionals statements that use the `when`, `failed_when`, and `changed_when` clauses as Jinja expressions.
+
+An Ansible rule is to always use `{{ }}` except with `when` keys.
+Using `{{ }}` in conditionals creates a nested expression, which is an Ansible
+anti-pattern and does not produce expected results.
+
+## Problematic Code
+
+```yaml
+---
+- name: Example playbook
+  hosts: localhost
+  tasks:
+    - name: Shut down Debian systems
+      ansible.builtin.command: /sbin/shutdown -t now
+      when: "{{ ansible_facts['os_family'] == 'Debian' }}" # <- Nests a Jinja expression in a conditional statement.
+```
+
+## Correct Code
+
+```yaml
+---
+- name: Example playbook
+  hosts: localhost
+  tasks:
+    - name: Shut down Debian systems
+      ansible.builtin.command: /sbin/shutdown -t now
+      when: ansible_facts['os_family'] == "Debian" # <- Uses facts in a conditional statement.
+```