Designing a Reasoning Ledger Record
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…
A reasoning ledger is a critical component for agentic systems, as it preserves the reasons behind decisions, not just the outcomes. This ledger should not have any enforcement power; its role is to act as an independent witness to the decision-making process. The ledger should record the policy evaluation results, but never the enforcement decisions itself.
When a decision is superseded, it should be recorded as a new event that references the previous one, rather than overwriting the original record. It is essential to capture how the authority for a decision was obtained, as different sources can provide varying levels of trust and knowledge at the time of the decision. To reconstruct the system's knowledge at a specific point in time, every relationship in the ledger should have two timestamps: one for the valid time and another for the transaction time.
This bitemporal modeling approach ensures that relationships can be accurately reconstructed, even if external authorities have changed since the decision was made.
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