Finance: Expense Audit Review with Codex: Sandbox Policy
A production playbook for expense audit review in finance operations using Codex: sandbox policy, run-scoped inputs, logs, typed results, and artifacts.
Audience: Finance teams auditing employee expenses
The problem
Finance teams auditing employee expenses need expense audit review to run repeatedly against receipts, policy docs, card transactions, and reimbursement requests. In finance operations, the pain is not one good answer; it is repeatability, auditability, exception handling, and evidence that survives handoff.
Implementation path
Run expense audit review in an ephemeral sandbox, keep provider credentials in the broker, expose narrow tools, and store logs outside the workspace for review.
Tradeoffs and failure modes
A narrower runtime blocks ambient machine behavior, but it gives security reviewers a concrete boundary. For expense audit review, the practical test is whether a second run can be debugged, retried, and consumed by a product without reading the raw agent transcript.
Runtime boundary
filesystem: /skill and /skill/.argo/inputs only
network: deny by default
artifacts: /skill/output/artifacts
logs: retained outside sandbox
provider: Codex
Run this on Argo