Create PR Skill

Instructions

Step 1: Gather Context

Detect the PR's base branch instead of hardcoding main. Set BASE_BRANCH once and reuse it in every diff/log command:

BASE_BRANCH=$(git rev-parse --abbrev-ref origin/HEAD 2>/dev/null | sed 's@^origin/@@')
BASE_BRANCH=${BASE_BRANCH:-main}

git rev-parse --abbrev-ref origin/HEAD returns the remote's default branch (e.g. origin/main); the sed strips the origin/ prefix. The fallback to main covers repos where origin/HEAD is unset. If you know the PR was branched off a non-default branch, override BASE_BRANCH explicitly before running the commands below.

1. Run git log "$BASE_BRANCH..HEAD" --oneline to see all commits on the current branch (fallback: git log "origin/$BASE_BRANCH..HEAD" --oneline).
2. Run git diff "$BASE_BRANCH...HEAD" --stat to see which files changed (fallback: git diff "origin/$BASE_BRANCH...HEAD" --stat).
3. Run git diff "$BASE_BRANCH...HEAD" to read the full diff (fallback: git diff "origin/$BASE_BRANCH...HEAD").
4. Check for local-only changes that won't be in the PR unless committed:
   • git status -sb
   • If there are uncommitted changes, explicitly call out that gh pr create can proceed but those changes will not be in the PR.

Step 2: Resolve the Linear Ticket

Resolve the Linear ticket from context, do not ask the user. The ticket is almost always derivable from one of:

1. The branch name. Most branches are named tml-NNNN-… (lower-case form of the Linear identifier). The current ticket is whatever matches (?i)\b(TML-\d+)\b in git rev-parse --abbrev-ref HEAD. Use the trailing slug from the branch name verbatim as $SLUG.
2. The conversation context. If the user previously linked or named a ticket in this conversation, use that.
3. The most recent commit messages on the branch. Look for a Refs: TML-NNNN or (TML-NNNN) trailer / mention in git log "$BASE_BRANCH..HEAD".