From 886faa2990b191a0dbd01dc58a88e09e342886b5 Mon Sep 17 00:00:00 2001
From: Sandy Tao <sandytao520@icloud.com>
Date: Mon, 14 Jul 2025 21:44:07 -0700
Subject: Log the 2 types of loop detection (#4193)

---
 packages/core/src/services/loopDetectionService.ts | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

(limited to 'packages/core/src/services/loopDetectionService.ts')

diff --git a/packages/core/src/services/loopDetectionService.ts b/packages/core/src/services/loopDetectionService.ts
index 57e0980c..c1078f69 100644
--- a/packages/core/src/services/loopDetectionService.ts
+++ b/packages/core/src/services/loopDetectionService.ts
@@ -6,6 +6,9 @@
 
 import { createHash } from 'crypto';
 import { GeminiEventType, ServerGeminiStreamEvent } from '../core/turn.js';
+import { logLoopDetected } from '../telemetry/loggers.js';
+import { LoopDetectedEvent, LoopType } from '../telemetry/types.js';
+import { Config } from '../config/config.js';
 
 const TOOL_CALL_LOOP_THRESHOLD = 5;
 const CONTENT_LOOP_THRESHOLD = 10;
@@ -24,6 +27,11 @@ export class LoopDetectionService {
   private lastRepeatedSentence: string = '';
   private sentenceRepetitionCount: number = 0;
   private partialContent: string = '';
+  private config: Config;
+
+  constructor(config: Config) {
+    this.config = config;
+  }
 
   private getToolCallKey(toolCall: { name: string; args: object }): string {
     const argsString = JSON.stringify(toolCall.args);
@@ -59,7 +67,14 @@ export class LoopDetectionService {
       this.lastToolCallKey = key;
       this.toolCallRepetitionCount = 1;
     }
-    return this.toolCallRepetitionCount >= TOOL_CALL_LOOP_THRESHOLD;
+    if (this.toolCallRepetitionCount >= TOOL_CALL_LOOP_THRESHOLD) {
+      logLoopDetected(
+        this.config,
+        new LoopDetectedEvent(LoopType.CONSECUTIVE_IDENTICAL_TOOL_CALLS),
+      );
+      return true;
+    }
+    return false;
   }
 
   private checkContentLoop(content: string): boolean {
@@ -94,6 +109,10 @@ export class LoopDetectionService {
       }
 
       if (this.sentenceRepetitionCount >= CONTENT_LOOP_THRESHOLD) {
+        logLoopDetected(
+          this.config,
+          new LoopDetectedEvent(LoopType.CHANTING_IDENTICAL_SENTENCES),
+        );
         return true;
       }
     }
-- 
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