> ## Documentation Index
> Fetch the complete documentation index at: https://wundergraphinc-brendan-add-sof-link.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Graph Pruning

> **Graph Pruning Linter** helps manage the cleanliness and efficiency of your GraphQL schema by running various checks on the schema. When enabled, the lint check will be performed on every [check](https://cosmo-docs.wundergraph.com/cli/subgraph/check) operation of that namespace.

<Frame caption="Graph Pruning Lint Rules Overview">
  <img src="https://mintcdn.com/wundergraphinc-brendan-add-sof-link/znnH7GFKh4R4ntTv/images/studio/graph-pruning-lint-rules-overview.png?fit=max&auto=format&n=znnH7GFKh4R4ntTv&q=85&s=965ff9073ee10c439ef91f2e60aed3eb" alt="Cosmo Studio Graph Pruning Linter interface showing rules for unused, deprecated, and deleted fields with severity and period settings." title="Graph Pruning Lint Rules Overview" width="1182" height="528" data-path="images/studio/graph-pruning-lint-rules-overview.png" />
</Frame>

## Rules

1. UNUSED\_FIELDS
   * Identifies and lists all fields that are not being used in the schema.
2. DEPRECATED\_FIELDS
   * Detects fields that have been deprecated but have not yet been removed from the schema.
3. REQUIRE\_DEPRECATION\_BEFORE\_DELETION
   * Identifies fields that were deleted without being marked as deprecated beforehand.

## Rule Configurations

### Severity Level

* Error:- If any configured rules are violated, it causes the check operation to fail.
* Warning:- If any configured rules are violated, they are flagged as warnings, but they don't cause the check operation to fail.

### Grace Period

This is the time period provided to the fields modified on schema publications, allowing time before enforcing these rules during checks.

### Schema Usage Check Period (Enterprise only)

* This is the time period used to check the usage of the field.
* For non-enterprise customers, the value is determined by the limits imposed on the organization according to its current billing plan.

## How to configure graph pruning linter

<Steps>
  <Step>
    Navigate to the Lint Policy page on Cosmo.
  </Step>

  <Step>
    Select the namespace.
  </Step>

  <Step>
    Enable the graph pruning linter.
  </Step>

  <Step>
    Configure the linter rules:

    * Check the checkbox to enable each rule.
    * Select the **severity level** (Warning or Error) for each rule.
    * Set the **grace period** for fields that are modified upon schema publication, allowing time before enforcing these rules during checks.
    * Configure the **schema usage check period** (available only for enterprise customers).
  </Step>
</Steps>