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+# avoid-implicit
+
+This rule identifies the use of dangerous implicit behaviors, often also
+undocumented.
+
+This rule will produce the following type of error messages:
+
+- `avoid-implicit[copy-content]` is not a string as [copy](https://docs.ansible.com/ansible/latest/collections/ansible/builtin/copy_module.html#synopsis)
+  modules also accept these, but without documenting them.
+
+## Problematic Code
+
+```yaml
+---
+- name: Example playbook
+  hosts: localhost
+  tasks:
+    - name: Write file content
+      ansible.builtin.copy:
+        content: { "foo": "bar" } # <-- should use explicit jinja template
+        dest: /tmp/foo.txt
+```
+
+## Correct Code
+
+```yaml
+---
+- name: Example playbook
+  hosts: localhost
+  tasks:
+    - name: Write file content
+      vars:
+        content: { "foo": "bar" }
+      ansible.builtin.copy:
+        content: "{{ content | to_json }}" # explicit better than implicit!
+        dest: /tmp/foo.txt
+```