diff --git a/clients/terminal/tui/renderers/markdown_content.py b/clients/terminal/tui/renderers/markdown_content.py
index 32f5af4..d5d9bf3 100644
--- a/clients/terminal/tui/renderers/markdown_content.py
+++ b/clients/terminal/tui/renderers/markdown_content.py
@@ -27,8 +27,16 @@
 
     def __rich_console__(self, console: Console, options: ConsoleOptions) -> RenderResult:
         theme = get_active_theme()
+        # Render at the *available* width (options.max_width), not the physical
+        # console width. Textual passes a console whose .width is the terminal
+        # width (e.g. 80), but the panel the markdown lives in is narrower —
+        # options.max_width holds the real available columns (panel inner width
+        # minus borders/padding). Using console.width here made rich wrap to the
+        # terminal width while the visible area was narrower, so the right side
+        # of every long line vanished off the panel's right edge. Fall back to
+        # console.width only if max_width is unset.
         themed_console = Console(
-            width=console.width,
+            width=options.max_width or console.width,
             color_system=console.color_system,
             theme=RichTheme(theme.rich_theme_styles()),
             force_terminal=True,