Only allow usage of diff tool if enabled in settings

src/shared/ExtensionMessage.ts

@@ -108,6 +108,7 @@ export interface ExtensionState {
 	experimentalDiffStrategy?: boolean
 	autoApprovalEnabled?: boolean
 	customModes: ModeConfig[]
+	toolRequirements?: Record<string, boolean> // Map of tool names to their requirements (e.g. {"apply_diff": true} if diffEnabled)
 }
 
 export interface ClineMessage {

src/shared/modes.ts

@@ -103,12 +103,24 @@ export function isCustomMode(slug: string, customModes?: ModeConfig[]): boolean
 	return !!customModes?.some((mode) => mode.slug === slug)
 }
 
-export function isToolAllowedForMode(tool: string, modeSlug: string, customModes: ModeConfig[]): boolean {
+export function isToolAllowedForMode(
+	tool: string,
+	modeSlug: string,
+	customModes: ModeConfig[],
+	toolRequirements?: Record<string, boolean>,
+): boolean {
 	// Always allow these tools
 	if (ALWAYS_AVAILABLE_TOOLS.includes(tool as any)) {
 		return true
 	}
 
+	// Check tool requirements if any exist
+	if (toolRequirements && tool in toolRequirements) {
+		if (!toolRequirements[tool]) {
+			return false
+		}
+	}
+
 	const mode = getModeBySlug(modeSlug, customModes)
 	if (!mode) {
 		return false