This is a recap of the top 10 posts on Hacker News on May 20, 2025.

The Windows Subsystem for Linux is now open source
https://blogs.windows.com/windowsdeveloper/2025/05/19/the-windows-subsystem-for-linux-is-now-open-source/
https://news.ycombinator.com/item?id=44031385

Zod 4
https://zod.dev/v4
https://news.ycombinator.com/item?id=44030850

Have I Been Pwned 2.0
https://www.troyhunt.com/have-i-been-pwned-2-0-is-now-live/
https://news.ycombinator.com/item?id=44035158

GitHub Copilot Coding Agent
https://github.blog/changelog/2025-05-19-github-copilot-coding-agent-in-public-preview/
https://news.ycombinator.com/item?id=44031432

DDoSecrets publishes 410 GB of heap dumps, hacked from TeleMessage
https://micahflee.com/ddosecrets-publishes-410-gb-of-heap-dumps-hacked-from-telemessages-archive-server/
https://news.ycombinator.com/item?id=44036647

Claude Code SDK
https://docs.anthropic.com/en/docs/claude-code/sdk
https://news.ycombinator.com/item?id=44032777

Jules: An Asynchronous Coding Agent
https://jules.google/
https://news.ycombinator.com/item?id=44034918

Game theory illustrated by an animated cartoon game
https://ncase.me/trust/
https://news.ycombinator.com/item?id=44031535

Run GitHub Actions locally
https://github.com/nektos/act
https://news.ycombinator.com/item?id=44003184

Launch HN: Better Auth (YC X25) – Authentication Framework for TypeScript
https://news.ycombinator.com/item?id=44030492