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Real example · Build apps (vibe coding)

Assign bug fixes and cleanups to GitHub Copilot coding agent

Stephen Toub (Microsoft, .NET team) · devblogs.microsoft.com ↗ · 2026-03-23 · 1 account

Free tier From $10/mo

Assign bug fixes and cleanups to GitHub Copilot coding agent — Image: devblogs.microsoft.com

What they did

Microsoft's .NET team let maintainers assign work to Copilot coding agent in the dotnet/runtime repo for ten months, then published the numbers.

How it went

Of 878 agent pull requests, 535 were merged (67.9% of those decided, versus 87.1% for Microsoft staff PRs) and 3 were later reverted. Cleanup and removal work did best (84.7%); performance work did worst (54.5%). A shared instructions file lifted success from 38.1% to 69%.

Worth knowing

Self-reported by the team that ships the product. Every PR was requested by a maintainer, 52% of merged ones needed human commits, and the author says review capacity became the bottleneck.

Try it yourself with GitHub Copilot

Replace anything in [brackets] with your details.

Prompt to paste

Issue for the coding agent: [clear description of the bug with steps to reproduce]. Expected result: [what should happen]. Add a test that fails before your fix and passes after. Follow the conventions in [instructions file, e.g. AGENTS.md]. Keep the change small and explain it in the PR description.

Read the original

Ten Months with Copilot Coding Agent in dotnet/runtime (.NET Blog) ↗
devblogs.microsoft.com · 2026-03-23 · Company blog

Attributed to the source linked below; not our own test.

Let an AI agent build a 3D museum showcase site alone

Claude

Let an AI agent build a 3D museum showcase site alone

Hady Raie gave Claude Opus 5.5 (as named in his video) one prompt for a 3D interactive showcase of the Grand Egyptian Museum, and left it for about 90 minutes. It made its own plan, generated images, turned them into 3D, wrote the code, screenshotted and fixed its own bugs, and published the site.

Hady Raie (YouTube, Egypt) · youtube.com · 2026-09-28 · 1 account

Built a delivery platform for a groundworks business for about $500

Lovable

Built a delivery platform for a groundworks business for about $500

Thomas Kednert, who runs a groundworks business north of Stockholm, and a tech-savvy friend built Kbag in Lovable over about three weeks: a site for ordering construction materials and waste collection, with live truck tracking, driver views and address-based pricing.

Thomas Kednert (Kedde), Kbag, Stockholm · lovable.dev · 2026-09-10 · 1 account

Claude Code

Built an AI personal-trainer web app with Claude Code in 34 minutes

In an Arabic walkthrough, Abdallah Khraisat builds a web app with sign-up, login and a database that generates a weekly workout plan from the equipment each user has at home. He builds it all in Claude Code, connects an AI model through an OpenRouter key, tests it, and publishes it through Hostinger.

Abdallah Khraisat (YouTube) · youtube.com · 2026-05-16 · 1 account

Cursor

What happens when a coding agent tries to fix a staging error alone

PocketOS, a small software firm serving car-rental companies, had a Cursor agent (running Claude Opus 4.6, per ABC News) hit a credential mismatch in staging. It chose on its own to fix it by deleting a Railway volume.

Jeremy Crane (PocketOS) · abcnews.com · 2026-04-29 · 1 account

Claude

Vibe-coded a mini app in an hour, then needed 100 hours to ship it

Mac Budkowski scoped an idea with ChatGPT and built Cryptosaurus with Claude Opus: a Farcaster mini app that turns a profile picture into a dino-styled image, generated through the Gemini API, which users can mint for $2.

Mac Budkowski (kanfa blog) · kanfa.macbudkowski.com · 2026-03-06 · 1 account