diff --git a/features/steps/tui_permission_question_widget_steps.py b/features/steps/tui_permission_question_widget_steps.py
index 3515df163..54e00b08c 100644
--- a/features/steps/tui_permission_question_widget_steps.py
+++ b/features/steps/tui_permission_question_widget_steps.py
@@ -141,6 +141,27 @@ def step_widget_text_contains(context: object, substring: str) -> None:
     assert substring in text, f"Expected '{substring}' in widget text:\n{text}"
 
 
+@then('the widget text should not contain "{substring}"')
+def step_widget_text_not_contains(context: object, substring: str) -> None:
+    text = context.widget._text  # type: ignore[attr-defined]
+    assert substring not in text, (
+        f"Did not expect '{substring}' in widget text:\n{text}"
+    )
+
+
+@when("I set the widget show_diff flag to {raw_value}")
+def step_set_widget_show_diff(context: object, raw_value: str) -> None:
+    desired = raw_value.strip().lower() == "true"
+    context.widget.show_diff = desired  # type: ignore[attr-defined]
+
+
+@then("the widget show_diff property should be {expected}")
+def step_check_widget_show_diff(context: object, expected: str) -> None:
+    expected_bool = expected.strip().lower() == "true"
+    actual = context.widget.show_diff  # type: ignore[attr-defined]
+    assert actual is expected_bool, f"Expected show_diff={expected_bool}, got {actual}"
+
+
 # ---------------------------------------------------------------------------
 # Key press steps
 # ---------------------------------------------------------------------------
diff --git a/features/tui_permission_question_widget.feature b/features/tui_permission_question_widget.feature
index 764231519..820ebfcaf 100644
--- a/features/tui_permission_question_widget.feature
+++ b/features/tui_permission_question_widget.feature
@@ -47,6 +47,31 @@ Feature: Permission Question Widget
     Given a PermissionQuestionWidget for "src/main.py" with type "file_write" and diff "@@ -1 +1 @@\n+x=1"
     Then the widget text should contain "PermissionsScreen"
 
+  Scenario: Widget creation with diff content renders diff by default
+    Given a PermissionQuestionWidget for "src/main.py" with type "file_write" and diff "@@ -1 +1 @@\n+x=1"
+    Then the widget text should contain "── diff ──"
+    And the widget text should contain "+x=1"
+    And the widget show_diff property should be True
+
+  Scenario: Widget diff visibility can be toggled off
+    Given a PermissionQuestionWidget for "src/main.py" with type "file_write" and diff "@@ -1 +1 @@\n+x=1"
+    When I set the widget show_diff flag to False
+    Then the widget text should not contain "── diff ──"
+    And the widget show_diff property should be False
+
+  Scenario: Widget diff visibility can be toggled on after hiding
+    Given a PermissionQuestionWidget for "src/main.py" with type "file_write" and diff "@@ -1 +1 @@\n+x=1"
+    When I set the widget show_diff flag to False
+    And I set the widget show_diff flag to True
+    Then the widget text should contain "── diff ──"
+    And the widget show_diff property should be True
+
+  Scenario: Widget show_diff property stays False without diff content
+    When I create a PermissionQuestionWidget for "src/auth/handler.py" with type "file_write"
+    Then the widget show_diff property should be False
+    When I set the widget show_diff flag to True
+    Then the widget show_diff property should be False
+
   # ── Allow action ──────────────────────────────────────────────────────────
 
   Scenario: Allow once via key "a"
diff --git a/src/cleveragents/tui/widgets/permission_question.py b/src/cleveragents/tui/widgets/permission_question.py
index 825329ece..9b8dd7ea0 100644
--- a/src/cleveragents/tui/widgets/permission_question.py
+++ b/src/cleveragents/tui/widgets/permission_question.py
@@ -163,10 +163,14 @@ class PermissionQuestionWidget(_StaticBase):
         super().__init__(*args, **kwargs)
         self._question = question
         self._selected_index: int = 0
-        self._show_diff: bool = False
+        self._show_diff: bool = question.has_diff
         self._decision: PermissionDecision | None = None
         self._open_full_screen: bool = False
-        self._text = render_permission_question(question, self._selected_index)
+        self._text = render_permission_question(
+            question,
+            self._selected_index,
+            show_diff=self._show_diff,
+        )
         self.update(self._text)
 
     # ── Public properties ─────────────────────────────────────────
@@ -191,6 +195,21 @@ class PermissionQuestionWidget(_StaticBase):
         """Return True if the user requested the full PermissionsScreen."""
         return self._open_full_screen
 
+    @property
+    def show_diff(self) -> bool:
+        """Return True when the diff content is currently visible."""
+        if not self._question.has_diff:
+            return False
+        return self._show_diff
+
+    @show_diff.setter
+    def show_diff(self, value: bool) -> None:
+        normalized_value = bool(value) and self._question.has_diff
+        if normalized_value == self._show_diff:
+            return
+        self._show_diff = normalized_value
+        self._refresh()
+
     # ── Navigation ────────────────────────────────────────────────
 
     def move_up(self) -> None:
@@ -245,6 +264,6 @@ class PermissionQuestionWidget(_StaticBase):
         self._text = render_permission_question(
             self._question,
             self._selected_index,
-            show_diff=self._show_diff,
+            show_diff=self.show_diff,
         )
         self.update(self._text)