The Task List Validator ensures that task lists (checkboxes) in pull request descriptions are completed. This is useful for enforcing pre-merge checklists, ensuring contributors follow important steps before their PRs are merged.

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Configuration

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type
string
required
Must be set to "taskList"
​
include
string | string[]
Section heading patterns to validate (checks task lists in these sections)
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message
string
Custom message to display when validation fails

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Basic Usage

validate:
  - type: "taskList"
    include: ["Checklist"]
    message: "Please complete all items in the PR checklist"

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Examples

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Simple Checklist Validation

Ensure all tasks in the “Checklist” section are completed: 
validate:
  - type: "taskList"
    include: "Checklist"
    message: "Please complete all items in the PR checklist"

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Multiple Sections

Check tasks in multiple sections: 
validate:
  - type: "taskList"
    include: ["Prerequisites", "Testing Checklist", "Documentation"]
    message: "Please complete all tasks in the required sections"

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Pattern Matching

Use patterns to match section headings: 
validate:
  - type: "taskList"
    include: [".*Checklist.*", "Pre-?merge( Tasks)?"]
    message: "Please complete all pre-merge tasks"

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How It Works

1

Parse Description

The validator parses the PR description to identify markdown sections and task lists
2

Identify Sections

It identifies sections that match the patterns specified in include
3

Check Task Lists

For each matching section, it verifies all task list items are checked
4

Return Result

Returns a validation result with status (pass, fail, or error) and a message
The validator looks for Markdown task lists in the format: 
- [ ] Unchecked task
- [x] Checked task

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Example PR Template

To make the most of this validator, create a PR template with task lists: 
## Description

[Describe your changes here]

## Checklist

- [ ] Code follows the style guidelines
- [ ] I have performed a self-review
- [ ] I have added tests for my changes
- [ ] Documentation has been updated
- [ ] The build passes locally
Save this template as .github/PULL_REQUEST_TEMPLATE.md in your repository.

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Practical Use Cases

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Pre-Merge Checklist

Ensure contributors confirm important checks before merging: 
ruleset:
  - name: "Pre-Merge Checklist"
    when:
      - "pull_request.opened"
      - "pull_request.edited"
      - "pull_request.ready_for_review"
    validate:
      - type: "taskList"
        include: "Checklist"
    on_failure:
      - label:
          add: ["checklist-incomplete"]
      - comment:
          body: |
            ## Incomplete Checklist

            Please complete all items in the PR checklist before requesting review.

            This helps ensure all our quality standards are met.

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Different Checklists by PR Type

Apply different checklists based on the type of PR: 
ruleset:
  - name: "Feature PR Checklist"
    when:
      - "pull_request.opened"
      - "pull_request.edited"
    if:
      - type: "title"
        match: "^feat: .*"
    validate:
      - type: "
include: "Feature Checklist"
    on_failure:
      - comment:
          body: |
            Please complete the Feature Checklist section in your PR description.

            This should confirm:
            - Feature requirements are met
            - Tests are added
            - Documentation is updated
            - Feature is backwards compatible (if applicable)

  - name: "Bug Fix Checklist"
    when:
      - "pull_request.opened"
      - "pull_request.edited"
    if:
      - type: "title"
        match: "^fix: .*"
    validate:
      - type: "taskList"
        include: "Bug Fix Checklist"
    on_failure:
      - comment:
          body: |
            Please complete the Bug Fix Checklist section in your PR description.

            This should confirm:
            - Root cause is identified
            - Test case reproduces the issue
            - Fix addresses the root cause
            - Regression tests are added

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Security Checklist

Enforce a security checklist for certain types of changes: 
ruleset:
  - name: "Security Checklist"
    when:
      - "pull_request.opened"
      - "pull_request.edited"
    if:
      - type: "files"
        modified:
          match: "src/(auth|security)/.*"
    validate:
      - type: "taskList"
        include: "Security Considerations"
    on_failure:
      - label:
          add: ["security-review-needed"]
      - comment:
          body: |
            ## Security Checklist Required

            Changes to security-related code require completing the Security Considerations checklist.

            Please update your PR description to include this section with all items checked.

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Specialized PR Templates

You can create specialized PR templates for different scenarios by using directories:
  1. Create a directory: .github/PULL_REQUEST_TEMPLATE/
  2. Add template files like:
    • feature.md - Template for feature PRs
    • bugfix.md - Template for bug fixes
    • security.md - Template for security-related changes
Contributors can then use the template that fits their PR: 
https://github.com/username/repo/compare/main...branch?template=feature.md

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Best Practices

Keep checklists focused and relevant
Include the most important checks that are often forgotten
Explain why each check is important
Group related items in sensible categories
Don’t make checklists too long or contributors might check items without properly considering them

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Customizing Feedback

Provide helpful guidance when tasks are incomplete: 
on_failure:
  - comment:
      body: |
        ## Incomplete PR Checklist

        Your PR is missing some completed items from the checklist. 

        Specifically:
        {{ validation_summary }}

        These checks help us maintain quality and consistency.
        Please review each item carefully and check it off when completed.