Definition
Plain language
A small structured note an AI agent keeps alongside its prose memory to record exact values.
As stated in the literature
In Fukui- and aging-paper interventions, a structured external memory slot holding exact numerical or categorical state outside lossy prose compaction; used to preserve running budgets and other values across sessions.
Why it matters: It preserves exact values across long sessions where prose-only memory would round, blur, or simply lose them.
For example, an agent tracking a $500 budget might keep '$372.18 remaining' in a structured slot so it survives even when the surrounding chat history gets summarized.
Heard on the show
“A typed-state overlay, described in the appendix, that holds the kind of exact values the prose summaries kept smudging.”Episode 086 — Why Frozen-Weight Agents Still Get Worse Over Time