A stateful AI agent stores durable task, entity, or conversation state outside one model response. It can compare current observations with prior ones, resume recurring routines, and maintain continuity across sessions.
Persistent browser sessions and shared files can support that continuity, but state needs lifecycle rules, identity controls, provenance, and recovery. Stale or cross-user state can otherwise create incorrect and unsafe actions.
ELI5
A stateful agent remembers useful information between steps or sessions instead of starting from nothing each time. Its saved state can include progress, earlier decisions, preferences, and unfinished work.
For example, a weekly reporting agent can remember which sources were processed last time and continue from the newest verified point. It must also recognize stale or user-specific state so old information does not cause a wrong action.
