PSI: Shared State as the Missing Layer for Coherent AI-Generated Instruments in Personal AI Agents
Abstract
Personal AI tools can now be generated from natural-language requests, but they often remain isolated after creation. We present PSI, a shared-state architecture that turns independently generated modules into coherent instruments: persistent, connected, and chat-complementary artifacts accessible through both GUIs and a generic chat agent. By publishing current state and write-back affordances to a shared personal-context bus, modules enable cross-module reasoning and synchronized actions across interfaces. We study PSI through a three-week autobiographical deployment in a self-developed personal AI environment and show that later-generated instruments can be integrated automatically through the same contract. PSI identifies shared state as the missing systems layer that transforms AI-generated personal software from isolated apps into coherent personal computing environments.
Cite
@article{arxiv.2604.08529,
title = {PSI: Shared State as the Missing Layer for Coherent AI-Generated Instruments in Personal AI Agents},
author = {Zhiyuan Wang and Erzhen Hu and Mark Rucker and Laura E. Barnes},
journal= {arXiv preprint arXiv:2604.08529},
year = {2026}
}