Ln 912 Community Announcer

Paths: File paths (shared/, references/, ../ln-*) are relative to skills repo root. If not found at CWD, locate this SKILL.md directory and go up one level for repo root.

ln-912-community-announcer

Type: L3 Worker (standalone) Category: 9XX Community Engagement Caller: ln-910-community-engagement (or standalone)

Composes and publishes structured announcements to GitHub Discussions (Announcements category).

Phase 0: GitHub Discovery

MANDATORY READ: Load ../ln-910-community-engagement/references/github_discovery.md

Execute the discovery protocol. Extract:

• {owner}/{repo} for URLs and git commands
• repo.id for GraphQL mutation
• categories["Announcements"] category ID for publishing
• Verify Announcements category exists

Load strategy: check docs/community_engagement_strategy.md in target project, fallback to ../ln-910-community-engagement/references/community_strategy_template.md. Extract Section 2 (Announcement Triggers) and Section 6 (Tone Guide).

MANDATORY READ: Load ../ln-910-community-engagement/references/discussion_formatting.md

Phase 1: Gather Context

1. Read strategy Section 2 -- verify this qualifies as an announcement
2. Read CHANGELOG.md -- extract the latest entry (or the entry matching $ARGUMENTS date if provided)
3. Read README.md -- check current version badge, any WARNING/IMPORTANT callouts
4. Run: git log --oneline -20 -- recent commits for context
5. If $ARGUMENTS contains a topic keyword (not a date), use it as the announcement subject
6. Run: git diff --name-only (uncommitted) or git diff --name-only HEAD~1..HEAD (last commit) -- build the list of changed files
7. Read key source files from the diff (max 5 files, prioritize by relevance to $ARGUMENTS topic):
   • Protocol/guide files in diff -> read full (the substance)
   • SKILL.md files in diff -> read only changed sections via git diff -- {file}
   • Reference files -> read if substantially changed
   • Goal: understand the "why" behind changes that CHANGELOG doesn't spell out

Phase 2: Classify Announcement Type

Determine the type based on gathered context:

Phase 3: Compose Announcement

Use the Announcement Structure Pattern from discussion_formatting.md (loaded in Phase 0).

Skill-specific additions beyond the shared pattern:

• Add ### Contributors section after ### What's Next — thank contributors by @mention if applicable (skip for solo work)
• Add footer: *Full changelog: [CHANGELOG.md](https://github.com/{owner}/{repo}/blob/{default_branch}/CHANGELOG.md)*
• If breaking change: include migration steps with clear before/after in an > [!IMPORTANT] alert

Phase 4: Fact-Check

Before presenting to user, verify every verifiable claim in the draft:

1. Commands & code blocks -- grep README.md for each command/snippet in the draft. If command not found -> replace with the actual command. Never invent install/update commands.
2. File paths & links -- verify each linked file exists: ls {path}. Remove or fix broken links.
3. Numbers -- verify counts mentioned against actual data: git diff --name-only | grep -c SKILL.md or ls -d ln-*/SKILL.md | wc -l.
4. Feature descriptions -- re-read the key source file (from Phase 1 step 7) and confirm the draft accurately describes what changed. No hallucinated capabilities.
5. Names -- verify names match actual directory/file names in the repo.

Gate: If any check fails, fix the draft before proceeding.

Phase 5: Review and Publish

Present the composed announcement title + body to the user. Wait for explicit approval before publishing.

After approval, publish via GraphQL using discovery context:

gh api graphql -f query='
  mutation($title: String!, $body: String!, $repoId: ID!, $catId: ID!) {
    createDiscussion(input: {
      repositoryId: $repoId,
      categoryId: $catId,
      title: $title,
      body: $body
    }) {
      discussion { url }
    }
  }
' -f title="TITLE_HERE" -f body="BODY_HERE" -f repoId="{repo.id}" -f catId="{categories.Announcements}"

Report the discussion URL to the user.

Note: Pinning is not available via API -- remind the user to pin manually in GitHub UI if the announcement is important.

Phase 6: Cross-Post (Optional)

If the announcement is a release or breaking change, suggest:

1. Create a matching GitHub Release if a version tag exists: gh release create vX.Y.Z --notes "See discussion: URL"
2. Update the repo description if the announcement changes the project scope

Definition of Done

• Context gathered (CHANGELOG, README, git log, key source files)
• Announcement type classified
• Draft composed using discussion_formatting.md patterns
• Fact-checked (commands, paths, numbers, descriptions, names verified)
• User approved final draft
• Published via GraphQL mutation, URL reported

Version: 1.0.0 Last Updated: 2026-03-13