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How to automate bug fixing and code upgrades with an AI agent

I looked through 114 real cases about bug fixing and code upgrades and pulled out what people actually did, the prompts they used and the places it went sideways. No theory, no invented success stories.

What people actually do

• Set up nightly smart-home routines by voice · Alexa+ · Home & Family
  One practitioner notes that the writer, a Tom's Guide reviewer and parent, had upgraded to Alexa+. She spoke one sentence to Alexa+ asking it to dim…
• Get status match and upgrade certificates, then book flight · Dots · Travel & Booking
  Four lie-flat upgrade certs plus a status match landed in John’s inbox because his Dot chased the forms, watched for confirmation mail, and read the…
• Tabnine solves developers’ pain points and enhances productivity with Claude · Amazon Bedrock · Customer Support
  Tabnine answers messages 50% faster and lifts conversions 20%. With Claude, Tabnine: Handles hundreds of thousands of messages per hour, delivering…
• Stripe deploys Claude Code to 1,370 engineers with zero-configuration enterprise rollout · Claude Code · Sales & Marketing
  Stripe rolled out Claude Code to 1,370 engineers. Read more How enterprises are building AI agents in 2026 New research from 500+ technical leaders…
• Spotify cuts migration time by 90% with Claude Agent SDK · Claude Code · Sales & Marketing
  Spotify cut code migration time up to 90%. Read the case study to see how they build on the Claude Agent SDK. Spotify , the world’s most popular…
• Office Hours: Asynchronous coding and the end of the IDE with Spotify · Claude Code · Software Development
  Spotify Boris Office Hours — Spotify VP of Engineering Niklas Gustavsson joins Boris Cherny on running agents across 20M+ lines of code. Boris…
• League cuts product development cycle times in half with Claude · Claude Code · Sales & Marketing
  League cut product development cycle times in half, from idea through pull request. With Claude, League: Cut product development cycle times in…
• LG CNS modernizes 20-year-old enterprise systems with Claude · Amazon Bedrock · Software Development
  Claude Code is the engine of its newest offering: LG CNS Build Factory, a turn-key software development service that modernizes decades-old…

Browse all 2754 cases to see the rest.

Prompts to start from

These are the reusable prompts from real cases. Swap in your own details, run it once on something low-stakes, and read what the agent did before you trust it.

Home/family task: set up nightly smart-home routines by voice. Keep changes reversible and ask before messages, payments, or deletes.

Plan: get status match and upgrade certificates, then book flight. Compare 2–3 options (cost, timing, tradeoffs), recommend one, and do not book or pay yet.

Tools that show up most

Claude Code (25), Cursor (9), Claude (8), Devin (7), Codex (6), Amazon Bedrock (5).

Guardrails

Work on a fresh branch, ask for a plan before edits, and review the diff and test results before merging.

Where it went wrong, or nearly did

• Validation agent that stops after three tries: A guardrail by design: it patches failures up to three times, then leaves a blocker note for a human.

More mess: the AI agent fails page. Related: the prompt library.