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Incident 1442: Kiro AI Coding Tool Was Reportedly Implicated in 13-Hour AWS Cost Explorer Outage in Mainland China

Responded
Description: Sometime in mid-December 2025, AWS Cost Explorer in one mainland China region reportedly experienced an approximately 13-hour interruption after Amazon engineers allegedly allowed Kiro, an internal AI coding tool, to make changes and it reportedly deleted and recreated part of the working environment. Amazon reportedly disputed that account, saying the interruption was an extremely limited event caused by user error and misconfigured access controls, not AI.
Editor Notes: Timeline notes: 12/15/2025 is an approximate date. Reporting appears only to state sometime in mid-December 2025. The incident ID was created 04/05/2026.

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The OECD AI Incidents and Hazards Monitor (AIM) automatically collects and classifies AI-related incidents and hazards in real time from reputable news sources worldwide.
 

Entities

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Alleged: Amazon Web Services (AWS) , Kiro and AWS Cost Explorer developed and deployed an AI system, which harmed Amazon Web Services (AWS) customers.
Alleged implicated AI systems: Kiro and AWS Cost Explorer

Incident Stats

Incident ID
1442
Report Count
5
Incident Date
2025-12-15
Editors
Daniel Atherton
Applied Taxonomies
MIT

MIT Taxonomy Classifications

Machine-Classified
Taxonomy Details

Risk Subdomain

A further 23 subdomains create an accessible and understandable classification of hazards and harms associated with AI
 

7.3. Lack of capability or robustness

Risk Domain

The Domain Taxonomy of AI Risks classifies risks into seven AI risk domains: (1) Discrimination & toxicity, (2) Privacy & security, (3) Misinformation, (4) Malicious actors & misuse, (5) Human-computer interaction, (6) Socioeconomic & environmental harms, and (7) AI system safety, failures & limitations.
 
  1. AI system safety, failures, and limitations

Entity

Which, if any, entity is presented as the main cause of the risk
 

AI

Timing

The stage in the AI lifecycle at which the risk is presented as occurring
 

Post-deployment

Intent

Whether the risk is presented as occurring as an expected or unexpected outcome from pursuing a goal
 

Unintentional

Incident Reports

Reports Timeline

Incident Occurrence+4
Amazon blames human employees for an AI coding agent’s mistake
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Amazon blames human employees for an AI coding agent’s mistake

Amazon blames human employees for an AI coding agent’s mistake

theverge.com

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13-hour AWS outage reportedly caused by Amazon's own AI tools

13-hour AWS outage reportedly caused by Amazon's own AI tools

engadget.com

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Amazon Reportedly Pins the Blame for AI-Caused Outage on Humans

Amazon Reportedly Pins the Blame for AI-Caused Outage on Humans

gizmodo.com

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Correcting the Financial Times report about AWS, Kiro, and AI

Correcting the Financial Times report about AWS, Kiro, and AI

aboutamazon.com

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How an AI Bot Named Kiro Took Down AWS Cost Explorer

How an AI Bot Named Kiro Took Down AWS Cost Explorer

singhajit.com

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Amazon blames human employees for an AI coding agent’s mistake
theverge.com · 2026

Amazon Web Services suffered a 13-hour outage to one system in December as a result of its AI coding assistant Kiro's actions, according to the Financial Times. Numerous unnamed Amazon employees told the *FT *that AI agent Kiro was responsi…

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13-hour AWS outage reportedly caused by Amazon's own AI tools
engadget.com · 2026
Lawrence Bonk post-incident response

A recent Amazon Web Services (AWS) outage that lasted 13 hours was reportedly caused by one of its own AI tools, according to reporting by Financial Times. This happened in December after engineers deployed the Kiro AI coding tool to make c…

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Amazon Reportedly Pins the Blame for AI-Caused Outage on Humans
gizmodo.com · 2026

When Amazon Web Services got hit by a 13-hour outage in December, it wasn't because a person tripped over a cord. According to a report from the Financial Times, several anonymous Amazon employees said that the outage was the fault of Kiro,…

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Correcting the Financial Times report about AWS, Kiro, and AI
aboutamazon.com · 2026
Amazon Staff post-incident response

We want to address the inaccuracies in the Financial Times' reporting yesterday. The brief service interruption they reported on was the result of user error---specifically misconfigured access controls---not AI as the story claims.

The dis…

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How an AI Bot Named Kiro Took Down AWS Cost Explorer
singhajit.com · 2026

In December 2025, Amazon Web Services experienced a 13-hour outage that started with an AI bot making a decision. Not a human engineer. An AI coding tool called Kiro decided the best way to fix a problem was to delete and recreate a product…

Variants

A "variant" is an AI incident similar to a known case—it has the same causes, harms, and AI system. Instead of listing it separately, we group it under the first reported incident. Unlike other incidents, variants do not need to have been reported outside the AIID. Learn more from the research paper.
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