diff --git a/apps/desktop/src/components/assistant-ui/tool-fallback.tsx b/apps/desktop/src/components/assistant-ui/tool-fallback.tsx
index fd7a9ad3cb6..5e8a1a0b182 100644
--- a/apps/desktop/src/components/assistant-ui/tool-fallback.tsx
+++ b/apps/desktop/src/components/assistant-ui/tool-fallback.tsx
@@ -77,6 +77,8 @@ const TOOL_SECTION_LABEL_CLASS = 'mb-1 text-[0.65rem] font-medium uppercase trac
 const TOOL_SECTION_SURFACE_CLASS =
   'max-h-20 max-w-full overflow-auto bg-transparent px-2 py-1.5 text-(--ui-text-secondary)'
 
+const TOOL_EXPANDED_SHELL_CLASS = 'rounded-[0.3125rem] border border-(--ui-stroke-tertiary)'
+
 const TOOL_SECTION_PRE_CLASS = cn(TOOL_SECTION_SURFACE_CLASS, 'font-mono text-[0.7rem] leading-relaxed')
 
 interface ToolStatusCopy {
@@ -372,7 +374,7 @@ function ToolEntry({ part }: ToolEntryProps) {
     <div
       className={cn(
         'min-w-0 max-w-full overflow-hidden text-[length:var(--conversation-tool-font-size)] text-(--ui-text-tertiary)',
-        open && 'rounded-[0.625rem] border border-(--ui-stroke-tertiary)'
+        open && TOOL_EXPANDED_SHELL_CLASS
       )}
       data-file-edit={isFileEdit && open ? '' : undefined}
       data-slot="tool-block"
diff --git a/apps/desktop/src/styles.css b/apps/desktop/src/styles.css
index 9487b636dfb..58221224fbd 100644
--- a/apps/desktop/src/styles.css
+++ b/apps/desktop/src/styles.css
@@ -264,7 +264,6 @@
     );
     --ui-chat-bubble-opaque-background: var(--ui-bg-editor);
     --ui-inline-code-background: color-mix(in srgb, #141414 5%, transparent);
-    --ui-inline-code-border: color-mix(in srgb, #141414 8%, transparent);
     --ui-inline-code-foreground: color-mix(in srgb, #141414 88%, transparent);
     --ui-selection-background: color-mix(in srgb, #ffd24a 55%, transparent);
 
@@ -408,7 +407,6 @@
     --backdrop-invert-mul: 0;
 
     --ui-inline-code-background: color-mix(in srgb, #ffffff 7%, transparent);
-    --ui-inline-code-border: color-mix(in srgb, #ffffff 10%, transparent);
     --ui-inline-code-foreground: color-mix(in srgb, #ffffff 88%, transparent);
     --ui-selection-background: color-mix(in srgb, #ffd24a 38%, transparent);
   }
@@ -1180,7 +1178,6 @@ canvas {
 }
 
 [data-slot='aui_assistant-message-content'] .aui-md :not(pre) > code {
-  border: 0.0625rem solid var(--ui-inline-code-border);
   background: var(--ui-inline-code-background);
   color: var(--ui-inline-code-foreground);
 }