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Prerequisites

Slack MCP (required) — used by step 7 to deliver channel posts and DMs (slack_send_message). Without it, the skill can compose and preview the message but cannot send it.
Atlassian MCP (optional) — used by step 3 to enrich the message with Jira ticket context (getJiraIssue). Without it, the Jira block is silently skipped.
gh CLI — used for all GitHub operations (gh pr view, gh pr diff, gh pr edit --add-reviewer). Not an MCP — install separately.
slack-channels and team-ref skills — invoked from step 5 to resolve channel and person targets. If they're not installed, ask the user to install them first or provide channel IDs / Slack user IDs inline.

If the user provided a PR number or URL, run: gh pr view <ref> --json url,title,body,number,headRefName
Otherwise run: gh pr view --json url,title,body,number,headRefName
If no PR is found, inform the user and stop.
Save the PR title, URL, body, and number for later steps.