update-pr-description

Pre-requisites

• gh CLI: !which gh 2>/dev/null || echo "not installed"

If the gh CLI is not found:

• Inform the user that it needs to be installed and configured before this skill can be used
• Immediately stop execution of this skill, as it cannot be executed

Project Context

• current branch: !git branch --show-current 2>/dev/null || echo unknown
• default branch: !git symbolic-ref --short refs/remotes/origin/HEAD 2>/dev/null || echo unknown
• branch summary: !git log origin/HEAD..HEAD --oneline 2>/dev/null || echo unknown
• branch stats: !git diff origin/HEAD...HEAD --stat 2>/dev/null || echo unknown
• branch changes: !git diff origin/HEAD...HEAD 2>/dev/null || echo unknown
• personal config directory: !bash "${CLAUDE_PLUGIN_ROOT}/scripts/han-config-dir.sh" 2>/dev/null || echo "$HOME/.claude"
• project .han/config.md: !cat .han/config.md 2>/dev/null || echo ""

As your first action, use the Read tool on .han/config.md inside the personal config directory path above. A read that returns no file is no personal configuration: continue silently. When that file or the project .han/config.md probe supplies content, apply it per config-rule.md, which governs precedence between the two files, relative-path resolution, and what to do with a file that reads but cannot be used.

Step 1: Validate Branch State

Before generating a PR description, verify the branch has content to describe:

1. If default branch is empty or unknown — origin/HEAD is not set. Use AskUserQuestion to ask the user for the default branch name (e.g., main, master, develop). Use that branch as the base for all git commands in subsequent steps, and recompute branch summary, branch stats, and branch changes against it — their Project Context values may read unknown because they were derived from the unset origin/HEAD.

2. If branch summary is empty — there are no commits on this branch relative to the default branch. Inform the user and stop.