Show HN: Qwen Meetup, Function Calling Harness, turning 6.75% to 100%

I was personally invited by the Qwen team to speak at Qwen Meetup Korea, and got to present locally here in Korea yesterday — pretty honored to have been reached out to directly.

The talk was about how I got function calling to work reliably on deeply recursive union types — the stuff the industry generally says doesn't work. With `qwen3-coder-next`, first-try success rate was 6.75%. And the entire Qwen 3.5 model family was hitting 0% on union types due to a consistent double-stringify bug. Both ended up at 100%.

Slides are also available here: https://autobe.dev/seminars/20260326-qwen-meetup-korea.pptx — speaker notes are written inside as slide notes if you'd like the full narrative behind each slide.