Felix Moser
Last Name
Moser
First name
Felix
Email
felix.moser@unisg.ch
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Item type:Publication, STELLA: An Open-Source Platform for Auditable Voice-First Conversational Health Coaching AgentsDeploying voice agents powered by LLMs creates tension between system auditability and the low latency required for natural conversation, while imposing heavy infrastructure burdens. We present STELLA, an open-source platform enabling the efficient deployment of voice-first agents. As a platform, STELLA provides ready-to-use infrastructure, including plan-based session management, modular expert pipelines, and a developer SDK. This eliminates the need for researchers to build complex audio and safety backends from scratch. To address the latency and auditability tension, STELLA’s default agent structurally decouples conversational presence from backend processing. Upon user input, the agent immediately delivers backchannel acknowledgments to maintain natural conversational flow, while safety arbitration and expert routing execute concurrently. A 32-participant field evaluation showed STELLA achieves 1.5-second median latency on commodity scientific hardware and above-median conversational quality in the 50th to 75th percentile ASAQ representative set, demonstrating feasibility for health coaching deployment and motivating future work on clinical applications such as cognitive stimulation therapy.Type:conference paperJournal:Proceedings of the 8th ACM Conference on Conversational User Interfaces - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Systematic scoping review and ethical analysis of digital health interventions for dementia and cognitive decline(Research Square (United States), 2026-08-19); ;