The Description Filter allows you to apply rules only when a pull request’s description contains (or doesn’t contain) specific content. This helps target rules based on the context or purpose described in the PR.

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Configuration

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type
string
required
Must be set to "description"
​
match
string | string[]
Pattern(s) that the description should match (supports regex)
​
ignore
string | string[]
Pattern(s) that the description should not match (supports regex)

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Basic Usage

if:
  - type: "description"
    match: "breaking change"

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Examples

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Match Specific Text

Apply a rule only when the description contains specific text: 
if:
  - type: "description"
    match: "breaking change"

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Match Multiple Patterns

Apply a rule when the description matches any of several patterns: 
if:
  - type: "description"
    match: ["fixes #\\d+", "resolves #\\d+", "closes #\\d+"]

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Exclude Patterns

Apply a rule only when the description doesn’t mention something: 
if:
  - type: "description"
    ignore: "WIP"

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Combined Matching

Apply a rule with both inclusion and exclusion patterns: 
if:
  - type: "description"
    match: "migration"
    ignore: ["revert", "rollback"]

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Pattern Matching

The Description Filter supports several pattern matching methods:
  1. Simple substring: "breaking change"
  2. Regular expressions: "/fixes #\\d+/i" (enclosed in forward slashes)
For case-insensitive matching with regex, use the i flag: "/breaking change/i"

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How It Works

1

Get Description

The filter retrieves the PR description from the GitHub event context
2

Check Match Patterns

If match is specified, it checks if the description matches any of the patterns
3

Check Ignore Patterns

If ignore is specified, it checks if the description matches any of the ignore patterns
4

Determine Result

Returns a match result based on whether the description satisfies all conditions

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Practical Use Cases

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Breaking Changes Workflow

Apply special rules to breaking changes: 
ruleset:
  - name: "Breaking Change Review"
    when:
      - "pull_request.opened"
      - "pull_request.edited"
    if:
      - type: "description"
        match: "BREAKING CHANGE"
    on_success:
      - label:
          add: ["breaking-change"]
      - requestReview:
          reviewers: ["api-team-lead", "product-manager"]
      - comment:
          body: |
            ## Breaking Change Detected

            This PR includes a breaking change and requires additional reviews.

            Please ensure this change:
            - Is absolutely necessary
            - Is properly documented
            - Has a migration path for existing users

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Issue References

Apply different rules based on whether a PR references an issue: 
ruleset:
  - name: "Issue Reference Required"
    when:
      - "pull_request.opened"
      - "pull_request.edited"
    if:
      - type: "description"
        ignore: ["fixes #\\d+", "closes #\\d+", "resolves #\\d+"]
    validate:
      - type: "description"
        match: "Issue: #\\d+"
    on_failure:
      - comment:
          body: |
            This PR doesn't appear to reference an issue.

            Please add a line like `Fixes #123` or `Issue: #123` to your description.

​
Release Notes Draft

Apply specific rules to PRs with draft release notes: 
ruleset:
  - name: "Release Notes Check"
    when:
      - "pull_request.opened"
      - "pull_request.edited"
    if:
      - type: "description"
        match: "## Release Notes"
    validate:
      - type: "description"
        length:
          min: 200
    on_failure:
      - comment:
          body: |
            Your PR includes a Release Notes section, but it appears too brief.

            Please provide more detailed release notes for user-facing changes.

​
Work In Progress

Skip certain validations for work-in-progress PRs: 
ruleset:
  - name: "WIP PR"
    when:
      - "pull_request.opened"
      - "pull_request.edited"
    if:
      - type: "description"
        match: "\\[WIP\\]|Work In Progress"
    on_success:
      - label:
          add: ["wip"]
      - comment:
          body: |
            This PR has been marked as a work in progress.

            Some validations will be skipped, but please mark it as ready for review when completed.

  - name: "Standard PR Validation"
    when:
      - "pull_request.opened"
      - "pull_request.edited"
    if:
      - type: "description"
        ignore: "\\[WIP\\]|Work In Progress"
    validate:
      - type: "title"
        match: "^(feat|fix|docs): .+"
      - type: "description"
        no_empty: true

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Best Practices

Keep pattern matching simple and focused
Provide clear explanations for pattern requirements
Consider case sensitivity in your patterns
Use PR templates to encourage consistent descriptions
Regex patterns can become complex; test them thoroughly to ensure they match as expected

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Integration with PR Templates

To make the most of the Description Filter, create a PR template with standard sections: 
<!-- .github/PULL_REQUEST_TEMPLATE.md -->

## Description

<!-- Describe your changes in detail -->

## Related Issues

<!-- Link to related issues using the format: Fixes #123 -->

## Type of Change

<!-- Mark with an `x` all the checkboxes that apply -->

- [ ] Bug fix
- [ ] New feature
- [ ] Breaking change
- [ ] Documentation update

## Testing

<!-- Describe the testing you've done -->

## Checklist

<!-- Mark with an `x` all the checkboxes that apply -->

- [ ] I have updated the documentation accordingly
- [ ] I have added tests to cover my changes
- [ ] All new and existing tests passed
This template creates predictable sections that your Description Filter can target.