> ## Documentation Index
> Fetch the complete documentation index at: https://docs.sidecardata.com/llms.txt
> Use this file to discover all available pages before exploring further.
# Custodian
> Use Custodian to review upstream pull requests for downstream data impact
Custodian reviews an upstream GitHub pull request and traces evidence-supported effects into one downstream repository. It can post a structured source-control review and, when configured, prepare a small downstream remediation for human review.
Custodian does not use the standard custom-job workflow. You duplicate its immutable **Review changes for downstream impacts** template and configure the copy.
## Requirements
You need:
* The Custodian GitHub app installed with access to the upstream repository
* The upstream repository bound to Custodian
* The standard Sidecar GitHub integration connected to the downstream repository
* One upstream and one downstream repository that are different
The trigger and delivery mode are fixed. The job runs when a pull request changes in the configured upstream repository. It does not have **Run now**.
Follow the [Custodian downstream-impact review recipe](/products/agent-console/recipes/custodian-downstream-impact-review) to configure the complete workflow.
