fix(core): Skip loop check for dividers (#6893)

packages/core/src/services/loopDetectionService.test.ts

@@ -558,6 +558,30 @@ describe('LoopDetectionService', () => {
     });
   });
 
+  describe('Divider Content Detection', () => {
+    it('should not detect a loop for repeating divider-like content', () => {
+      service.reset('');
+      const dividerContent = '-'.repeat(CONTENT_CHUNK_SIZE);
+      let isLoop = false;
+      for (let i = 0; i < CONTENT_LOOP_THRESHOLD + 5; i++) {
+        isLoop = service.addAndCheck(createContentEvent(dividerContent));
+        expect(isLoop).toBe(false);
+      }
+      expect(loggers.logLoopDetected).not.toHaveBeenCalled();
+    });
+
+    it('should not detect a loop for repeating complex box-drawing dividers', () => {
+      service.reset('');
+      const dividerContent = '╭─'.repeat(CONTENT_CHUNK_SIZE / 2);
+      let isLoop = false;
+      for (let i = 0; i < CONTENT_LOOP_THRESHOLD + 5; i++) {
+        isLoop = service.addAndCheck(createContentEvent(dividerContent));
+        expect(isLoop).toBe(false);
+      }
+      expect(loggers.logLoopDetected).not.toHaveBeenCalled();
+    });
+  });
+
   describe('Reset Functionality', () => {
     it('tool call should reset content count', () => {
       const contentEvent = createContentEvent('Some content.');

packages/core/src/services/loopDetectionService.ts

@@ -169,8 +169,16 @@ export class LoopDetectionService {
       /(^|\n)\s*[*-+]\s/.test(content) || /(^|\n)\s*\d+\.\s/.test(content);
     const hasHeading = /(^|\n)#+\s/.test(content);
     const hasBlockquote = /(^|\n)>\s/.test(content);
+    const isDivider = /^[+-_=*\u2500-\u257F]+$/.test(content);
 
-    if (numFences || hasTable || hasListItem || hasHeading || hasBlockquote) {
+    if (
+      numFences ||
+      hasTable ||
+      hasListItem ||
+      hasHeading ||
+      hasBlockquote ||
+      isDivider
+    ) {
       // Reset tracking when different content elements are detected to avoid analyzing content
       // that spans across different element boundaries.
       this.resetContentTracking();
@@ -179,7 +187,7 @@ export class LoopDetectionService {
     const wasInCodeBlock = this.inCodeBlock;
     this.inCodeBlock =
       numFences % 2 === 0 ? this.inCodeBlock : !this.inCodeBlock;
-    if (wasInCodeBlock || this.inCodeBlock) {
+    if (wasInCodeBlock || this.inCodeBlock || isDivider) {
       return false;
     }