> ## Documentation Index
> Fetch the complete documentation index at: https://docs.useharmonia.xyz/llms.txt
> Use this file to discover all available pages before exploring further.

# Operations overview

> Operate Harmonia through failure, recovery, approval, replay, observability, and deployment.

Operations begins from persisted truth. A model response, log line, Pub/Sub delivery, or external API response is not by itself proof that a job advanced or an effect succeeded.

<CardGroup cols={2}>
  <Card title="Operating model" href="/operational-model">Understand workers, outboxes, retries, and ownership.</Card>
  <Card title="Recover failures" href="/failure-recovery">Classify failures and resume safely.</Card>
  <Card title="Audit authority" href="/approval-and-audit">Trace digest-bound human decisions.</Card>
  <Card title="Inspect telemetry" href="/observability">Correlate jobs, operations, traces, and usage.</Card>
</CardGroup>

Use [State ownership](/state-ownership) when two systems disagree and [Record and replay](/record-replay) when validating idempotency or reproducing an execution.