A companion to Part 4 of the Building the AI Memory Stack series. Part 4.5 of the series.
Part 4 argued that agentic systems need a Reasoning Ledger: a layer that preserves why a decision happened, not just what was decided. The comment thread that followed turned into something more specific and more useful, a working design conversation about what a single ledger record should actually contain. This piece consolidates that. Several of the strongest ideas below arrived from other people, and I have tried to credit them where they land.
The easy version of this article is a schema. Here are the fields, copy them, done.
I want to resist that, because the field list is the least durable thing I could hand you. Implementations differ, field names drift, and a record shape copied without its reasoning becomes cargo-cult structure that nobody maintains. The useful thing is the set of design tensions that decide what belongs in the record and what does not. Get those right and you can derive the fields yourself. Get them wrong and no schema will save you.
So this is principles first, record second. At the end there is a worked record and a field reference, tagged for what is core and what is genuinely optional.
