Show HN: Julius Slack Agent (and how to build your own) (julius.ai)

A Show HN post announced Julius’s new Slack Agent and a tutorial for “how to build your own,” but the live demo/documentation on julius.ai is currently failing with a client-side JavaScript exception. Visitors hit a RangeError: “invalid field value” coming from Next.js static chunks (stack traces reference functions like eG.fromFieldsV7, generateOrAbort and session/window ID checks), and the page shows “Application error: a client-side exception has occurred” with an instruction to contact team@julius.ai. The outage matters because Slack agents are a practical on-ramp for integrating LLM-driven workflows into team chat — useful for automations, summarization, and retrieval-augmented responses — and hands-on build guides accelerate adoption. Technically, the error points to malformed or invalid client-side data being passed into a generator function in the frontend bundle (likely unchecked field values or serialization issues), highlighting common failure modes in LLM agent UIs: brittle client validation, fragile session/window ID handling, and the need for robust telemetry and graceful degradation. If you intended to try the agent or follow the tutorial, check the Hacker News/post comments or the project repo for alternate links, inspect your browser console for the exact failure, or contact the Julius team as suggested.