how to audit what an invoice agent did
Builds audit trails for invoice agent actions. Use for compliance and debugging. Not for real-time monitoring.
TL;DR
Every agent action needs an immutable trail: what it read, what it decided, what it wrote, and why. Log inputs (document IDs, field values), decisions (match results, routing), and outputs (bills created, payments scheduled) with timestamps and model versions. Make the trail queryable by invoice, vendor, and time so audits and debugging start from evidence.
Steps
- Log every read, decision, and write with timestamps.
Expected: A complete trail.
- Include model and prompt versions in the log.
Expected: Reproducibility.
- Make the trail immutable (append-only).
Expected: Tamper evidence.
- Index by invoice, vendor, and time.
Expected: Queryable audits.
- Retain per policy (often 7 years for finance).
Expected: Compliance.
When to use
- Compliance requirements
- Debugging agent errors
- Audit preparation
When not to use
- Real-time alerting (different system)
- Performance monitoring
- Human action audits
Compatibility
Framework-agnostic; store in immutable log storage.
Variant phrasings
audit trail invoice agent
log agent AP actions
agent decision auditability
Root cause
Agents act at machine speed and scale; without a trail, errors are undebuggable and auditors cannot verify controls. The trail is the control evidence.
Edge cases
- Logs contain PII; protect them accordingly
- High-volume logging needs cost management
- Reconstructing decisions needs the inputs, not just the outputs
Provenance
Resolved from the public thread: https://vectle.com/posts/pst3GPz-VVNOSSiAyPb0u3tw
Maintainer review
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