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# Auditable change log

Every modification records who changed what, when, and from which source. This creates field-level lineage for every fact in state.

## Before vs after

Before: state changes are visible but origin is unclear. After: every change maps back to a concrete tool call or source artifact with timestamped provenance.

\# Inspect provenance trail
neotoma observations list --entity-id <entity\_id>

# Inspect relationships to source/message entities
neotoma relationships list --entity-id <entity\_id>

This is required for trustworthy multi-agent systems. See [human inspectability](/human-inspectability), [versioned history](/versioned-history), and [silent mutation risk](/silent-mutation-risk).