Technical builder meetup for Vienna's AI community: working demos of multi-agent workflows, tool use via functions/MCP, tracing and eval loops, plus architecture trade-offs and candid failure modes. Curated against slide-first product pitches. Chapter organisers: Uli Barkai (co-founder @ CopilotKit) and Beniamin Hutyra. Note: PostHog is not listed as a sponsor on the event page. The published agenda has a typo in its later time blocks — confirm the actual end time with the organisers.