sync-changelog - SKILL.md Agent Skill

name: sync-changelog description: Sync the changelog from the Dart SDK repo to update the changelog.yml entries in the site repository.

Sync SDK changelog

When you need to update the changelog entries in src/data/changelog.yml with the latest changes from the Dart SDK repository, carefully follow the steps outlined in this skill.

Validate the SDK version

Before running the sync tool, verify the Dart SDK version you wish to sync. It should be a stable release, not a pre-release, and in major.minor.patch format.

If the user provides a version with just major.minor, you can assume a patch version of 0. For example, 3.11 implies 3.11.0.

If necessary, you can validate what versions are available to sync by checking the SDK changelog and checking what h2 headers (##) are present.

Sync and verify SDK changelog entries

Run the sync tool

Execute the sync-changelog CLI command from within the website repository and specify the SDK version you want to sync.
- Command:
```
dart run dash_site sync-changelog --version <VERSION>
```
- Example:
```
dart run dash_site sync-changelog --version 3.11.0
```
[!TIP] You can preview the changes first by specifying the --dry-run flag:
```
dart run dash_site sync-changelog --version 3.11.0 --dry-run
```
Verify changes

Check src/data/changelog.yml to ensure new entries are correct.
- Review the diff: git diff src/data/changelog.yml
- Ensure formatting is consistent and the new entries are prepended correctly.
Filter and prune entries

Remove entries that don't represent concrete, user-facing changes to the Dart SDK, Dart language, or its surrounding tooling.

Remove entries that are:
- Vague or nebulous: Such as "Various performance improvements" or "Minor internal updates". Users need to know _what improved.
- Non-functional: Such as "Thanks to @user for...", "Fixed typo in comment".
- Redundant: Entries that duplicate others for the same feature.
Refine tags

Review the description of each new entry. The tool uses keywords to infer tags, (such as "fixes" -> fixed, "adds" -> new), but you must verify them.

Rule: If an entry has the wrong tag, or is just changed when it should be specific, you must correct it in src/data/changelog.yml before finishing. Entries can and should have multiple tags if applicable, such as having both removed and breaking.

Available tags and guidelines:
- new: For new features, additions, or introductions, such as indicated by "Added ..." or "Introduced...".
- fixed: For bug fixes, such as indicated by "Fixed ..." or "Bug fix...".
- deprecated: For deprecations, such as indicated by "Deprecated..." or "marked as legacy...".
- experimental: For changes related to experimental features, such as indicated by "Experimental..." or "Preview...".
- removed: For feature, capability, or API removals, such as indicated by "Removed..." or "Deleted...".
- breaking: For breaking or backwards incompatible changes, such as indicated by "Breaking change...". Often used with removed or other significant modifications.
- versioned: For changes that are language versioned, such as a new language syntax which often are.
- changed: For general updates or modifications, a default tag that can be used as a fallback.
Example:
```
- version: 3.11.0
  # ...
  description: |
    Added support for Unix domain sockets...
  tags:
    - new  # Changed from 'changed' because it adds a new feature.
```
Ensure the presence of links

Ensure every entry has a valid URL set as its link field. If no specific issue or PR link is available in the description, link to the specific section in the SDK changelog.
- Format: https://github.com/dart-lang/sdk/blob/main/CHANGELOG.md#<VERSION_ANCHOR>
- Example: https://github.com/dart-lang/sdk/blob/main/CHANGELOG.md#3110 (for 3.11.0)
```
- version: 3.11.0
  # ...
  link: https://github.com/dart-lang/sdk/blob/main/CHANGELOG.md#3110
```
Fix any formatting or typo issues

Review the changelog entries for issues such as:
- Markdown or YAML syntax issues.
- Typos or grammatical errors.
- subArea fields that aren't in sentence case. For example, use "Type promotion" instead of "Type Promotion". If a word isn't a proper noun, and it isn't the first word, don't capitalize it.
If found, fix them before continuing on.
Request user review

Notify the user that the changelog has been updated and tags refined. Ask them to verify the changes before committing.

Troubleshooting

If no entries are found, verify the version exists in the SDK changelog.
If entries are missing or malformed, check the tool logic in tool/dash_site/lib/src/commands/sync_changelog.dart.