diff --git a/.changeset/orange-geese-provide.md b/.changeset/orange-geese-provide.md
new file mode 100644
index 0000000000..7a4354e84d
--- /dev/null
+++ b/.changeset/orange-geese-provide.md
@@ -0,0 +1,5 @@
+---
+"roo-cline": patch
+---
+
+Allow users to clear out custom instructions for the built-in modes
diff --git a/webview-ui/src/components/prompts/PromptsView.tsx b/webview-ui/src/components/prompts/PromptsView.tsx
index 06cfb65135..8b46e488ae 100644
--- a/webview-ui/src/components/prompts/PromptsView.tsx
+++ b/webview-ui/src/components/prompts/PromptsView.tsx
@@ -804,7 +804,7 @@ const PromptsView = ({ onDone }: PromptsViewProps) => {
 									const existingPrompt = customModePrompts?.[mode] as PromptComponent
 									updateAgentPrompt(mode, {
 										...existingPrompt,
-										customInstructions: value.trim() || undefined,
+										customInstructions: value.trim(),
 									})
 								}
 							}}