3 files changed, 38 insertions, 1 deletions
diff --git a/packages/core/src/telemetry/clearcut-logger/clearcut-logger.ts b/packages/core/src/telemetry/clearcut-logger/clearcut-logger.ts
index 81a9ca4b..cfbbdda6 100644
--- a/packages/core/src/telemetry/clearcut-logger/clearcut-logger.ts
+++ b/packages/core/src/telemetry/clearcut-logger/clearcut-logger.ts
@@ -20,6 +20,7 @@ import {
   LoopDetectedEvent,
   NextSpeakerCheckEvent,
   SlashCommandEvent,
+  MalformedJsonResponseEvent,
 } from '../types.js';
 import { EventMetadataKey } from './event-metadata-key.js';
 import { Config } from '../../config/config.js';
@@ -42,6 +43,7 @@ const flash_fallback_event_name = 'flash_fallback';
 const loop_detected_event_name = 'loop_detected';
 const next_speaker_check_event_name = 'next_speaker_check';
 const slash_command_event_name = 'slash_command';
+const malformed_json_response_event_name = 'malformed_json_response';
 
 export interface LogResponse {
   nextRequestWaitMs?: number;
@@ -557,6 +559,21 @@ export class ClearcutLogger {
     this.flushIfNeeded();
   }
 
+  logMalformedJsonResponseEvent(event: MalformedJsonResponseEvent): void {
+    const data = [
+      {
+        gemini_cli_key:
+          EventMetadataKey.GEMINI_CLI_MALFORMED_JSON_RESPONSE_MODEL,
+        value: JSON.stringify(event.model),
+      },
+    ];
+
+    this.enqueueLogEvent(
+      this.createLogEvent(malformed_json_response_event_name, data),
+    );
+    this.flushIfNeeded();
+  }
+
   logEndSessionEvent(event: EndSessionEvent): void {
     const data = [
       {
diff --git a/packages/core/src/telemetry/clearcut-logger/event-metadata-key.ts b/packages/core/src/telemetry/clearcut-logger/event-metadata-key.ts
index 01dd42af..0fc35894 100644
--- a/packages/core/src/telemetry/clearcut-logger/event-metadata-key.ts
+++ b/packages/core/src/telemetry/clearcut-logger/event-metadata-key.ts
@@ -183,6 +183,13 @@ export enum EventMetadataKey {
 
   // Logs the result of the next speaker check
   GEMINI_CLI_NEXT_SPEAKER_CHECK_RESULT = 44,
+
+  // ==========================================================================
+  // Malformed JSON Response Event Keys
+  // ==========================================================================
+
+  // Logs the model that produced the malformed JSON response.
+  GEMINI_CLI_MALFORMED_JSON_RESPONSE_MODEL = 45,
 }
 
 export function getEventMetadataKey(
diff --git a/packages/core/src/telemetry/types.ts b/packages/core/src/telemetry/types.ts
index 6fe797bf..1633dbc4 100644
--- a/packages/core/src/telemetry/types.ts
+++ b/packages/core/src/telemetry/types.ts
@@ -296,6 +296,18 @@ export class SlashCommandEvent {
   }
 }
 
+export class MalformedJsonResponseEvent {
+  'event.name': 'malformed_json_response';
+  'event.timestamp': string; // ISO 8601
+  model: string;
+
+  constructor(model: string) {
+    this['event.name'] = 'malformed_json_response';
+    this['event.timestamp'] = new Date().toISOString();
+    this.model = model;
+  }
+}
+
 export type TelemetryEvent =
   | StartSessionEvent
   | EndSessionEvent
@@ -307,4 +319,5 @@ export type TelemetryEvent =
   | FlashFallbackEvent
   | LoopDetectedEvent
   | NextSpeakerCheckEvent
-  | SlashCommandEvent;
+  | SlashCommandEvent
+  | MalformedJsonResponseEvent;