Anomaly Detection Audit Trail

The problem

Finance teams deploy AI agents to monitor thousands of transactions per day for anomalies — duplicate payments, unusual vendor activity, transactions at suspicious times. But when an auditor asks how the organization governs these agents — what they flag, why they flag it, how accurate they are, and who reviews their work — most teams have no structured answer.

Thirteen anomaly subtypes

Sigmodx records the anomaly subtype the agent detected — including duplicate payments (same vendor, similar amount, close dates), revenue reversals after period close, velocity anomalies (unusual transaction frequency), and split transactions designed to avoid approval thresholds — without storing raw transaction data.

Reliability signals

Five signals are computed from human review: false positive rate, false negative rate, detection precision, escalation rate, and severity accuracy. False negative rate carries the most weight — an agent that misses real anomalies moves to LIMIT above 2% and BLOCK above 5%.

Integration

pip install sigmodx

from sigmodx import SigmodxClient

client = SigmodxClient(api_key="...", agent_id="...")

input_hash = client.hash_inputs({
    "txn_ref": "TXN-2026-4421",
    "amount": 14250,
})

result = client.submit_anomaly_decision(
    decision_type="flag",
    input_hash=input_hash,
    rationale="Transaction matches prior payment within 0.4%.",
    anomaly_subtype="duplicate_payment",
    severity="high",
    transaction_amount=14250,
)

pip install sigmodx sigmodx-integrations

from sigmodx import SigmodxClient
from sigmodx_integrations import SigmodxCallbackHandler, ANOMALY_DETECTION_CONFIG

client = SigmodxClient(api_key="...", agent_id="...")
handler = SigmodxCallbackHandler(
    client=client,
    config=ANOMALY_DETECTION_CONFIG,
)

# Every tool call is automatically logged to Sigmodx
agent_executor.invoke(
    {"input": "Monitor transaction TXN-2026-4421"},
    config={"callbacks": [handler]},
)

pip install sigmodx-mcp

SIGMODX_API_KEY=your-key \
SIGMODX_AGENT_ID=your-agent-uuid \
sigmodx-mcp

{
  "mcpServers": {
    "sigmodx": {
      "command": "sigmodx-mcp",
      "env": {
        "SIGMODX_API_KEY": "your-api-key",
        "SIGMODX_AGENT_ID": "your-agent-uuid"
      }
    }
  }
}