Check event triggers before leaving Kiro unattended

Kiro’s thumbnail feature wrote back into the bucket that triggered it; AWS caught the recursive Lambda loop. Use separate buckets.

In short

What it does: Kiro’s thumbnail feature wrote back into the bucket that triggered it; AWS caught the recursive Lambda loop. Use separate buckets.

Agent: Kiro · Category: DevOps

Steps in brief:

  1. Before walking away, review what triggers each function and where its outputs land.
  2. Break write-back loops: separate buckets for originals and derivatives, or filter the trigger by prefix.
  3. “It deployed and the happy path worked” isn’t “safe to walk away”; test the side effects.

Who made it: pmalmirae (DEV post, 13 Oct 2026) · source

Last updated · based on 336 use cases on agentsetups, each credited to its author.

by pmalmirae13 Oct 2026

Prompt for your agent

Goal: Let an agent build serverless features without creating runaway loops.
Setup: agents used in source: Kiro; tools/MCPs stated: AWS Lambda, S3, Terraform, Go.
Steps:
1. Before walking away, review what triggers each function and where its outputs land.
2. Break write-back loops: separate buckets for originals and derivatives, or filter the trigger by prefix.
3. “It deployed and the happy path worked” isn’t “safe to walk away”; test the side effects.
Rules: ask me before anything irreversible (sending, posting, paying, deleting); don’t invent data, results or tools I haven’t given you; tell me what you couldn’t verify.
Based on: pmalmirae — https://dev.to/aws-builders/dont-try-this-at-home-what-happened-when-i-sent-kiro-to-work-and-went-gardening-131c

Steps are from the source. Includes a “Based on” credit line.

I tried this

Tell the next builder. One anonymous answer each; click again to undo.

Agents, models and tools only what the source states

Agents
Kiro
Tools
  • AWS Lambda
  • S3
  • Terraform
  • Go

Sources & credit