Slack announcement skill

Goal

A single Slack-ready post that summarises user-visible changes across Ark core and the Marketplace for a given window, grouped by theme, with markdown-style docs links, and a forward-looking section.

Inputs to confirm with the user

• Window — explicit versions (e.g. v0.1.55 → v0.1.60) or a date range. If unclear, ask.
• Depth — full long-form post, a short #announcements variant, or both (thread reply). Default full.

Process

1. Pull releases from BOTH repos

Always check both. A release in one repo often has no matching entry in the other.

# Ark core
gh release list --repo mckinsey/agents-at-scale-ark --limit 60
gh release view <tag> --repo mckinsey/agents-at-scale-ark --json body