diff --git a/.changeset/fix-diff-viewer-corners.md b/.changeset/fix-diff-viewer-corners.md
new file mode 100644
index 00000000000..ed8c1520ac3
--- /dev/null
+++ b/.changeset/fix-diff-viewer-corners.md
@@ -0,0 +1,5 @@
+---
+"kilo-code": patch
+---
+
+Remove stray rounded corners between files in the Changes diff viewer.
diff --git a/packages/kilo-vscode/webview-ui/agent-manager/agent-manager.css b/packages/kilo-vscode/webview-ui/agent-manager/agent-manager.css
index 0ef4932198c..7eea66cc458 100644
--- a/packages/kilo-vscode/webview-ui/agent-manager/agent-manager.css
+++ b/packages/kilo-vscode/webview-ui/agent-manager/agent-manager.css
@@ -1872,7 +1872,7 @@ body.am-wt-dragging-active * {
   --sticky-accordion-top: 0px;
 }
 
-/* Ensure accordion headers always span full panel width */
+/* Ensure virtualized accordion rows span the panel without per-row rounded corners. */
 .am-diff-content [data-component="accordion"],
 .am-review-diff-content [data-component="accordion"] {
   width: 100% !important;
@@ -1889,6 +1889,13 @@ body.am-wt-dragging-active * {
   align-self: stretch !important;
 }
 
+.am-diff-content [data-slot="accordion-trigger"],
+.am-review-diff-content [data-slot="accordion-trigger"],
+.am-diff-content [data-slot="accordion-content"],
+.am-review-diff-content [data-slot="accordion-content"] {
+  border-radius: 0 !important;
+}
+
 .am-diff-content [data-slot="accordion-item"][data-file-path],
 .am-review-diff-content [data-slot="accordion-item"][data-file-path] {
   width: 100% !important;