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

# Evaluation

> Continuous re-evaluation and drift detection keep your context accurate as data changes.

<Info>Starter page — expand with the evaluation dashboard and drift workflow.</Info>

The open-source harness gives you a [one-shot eval delta](/open-source/evaluation) you run locally.
The hosted product turns that into a continuous system so your context stays trustworthy as the
underlying data and definitions change.

## What the hosted evaluation adds

* **Continuous re-evaluation** — re-run the eval pairs on a schedule, not just once, and track
  accuracy over time.
* **Drift detection** — flag when an upstream dbt model a definition depends on changes, so a human
  re-confirms before the agent trusts stale context.
* **Correction harvesting** — turn analyst corrections into new labeled ground truth that feeds the
  next evaluation.

Together with [observability](/enterprise/observability), this is how data teams keep context
correct as they scale self-service analytics. For a demo, requirements, or pricing, **contact
sales** at [info@nodaldata.io](mailto:info@nodaldata.io).