Arc Work Issue

Work Issue

Open an isolated git worktree, implement one open GitHub issue, then ship it. The leading word is worktree-first: never implement on the main checkout. PR mechanics (push, PR creation, merge) are delegated to arc-git-pr-check.

Load WORKTREE.md before creating the worktree. Load arc-conventional-commits before committing for commit type and message format.

Orchestrator route guidance

Standalone behavior remains unchanged: without an orchestrator, --ship merge is the default and arc-git-pr-check retains all of its ship modes. Under an orchestrator, omitted ship mode means PR-first --ship pr; honor an explicit caller request for --ship auto or --ship merge. The parent creates and owns the worktree, decides the approach, inspects worker evidence, and retains review judgment and approval.

• Use codex-explore for bounded read-only repository investigation before the parent chooses an approach.
• Use composer-implement for clear, mechanical implementation in the issue worktree. This is the Cursor/Composer implementation lane; there is no separate cursor-implement route.
• Use codex-implement for difficult implementation, debugging-heavy work, or escalation after Composer misses the bar.
• Use codex-check for independent correctness, regression, security, and acceptance-criteria review; use opus-review for taste-sensitive UI/UX, API, architecture, copy, docs, prompt, or skill review.
• If Codex is unavailable, use the matching opus-explore, opus-check, or opus-implement availability fallback.

Give each write-capable worker only the isolated issue worktree. Workers make scoped edits and run verification, but never commit, push, comment, merge, deploy, edit secrets, or touch unrelated files. Review workers return findings instead of posting them. After acceptance, the parent delegates commit and push to mechanical-commit-push, directly opens the PR with gh pr create, delegates PR comments to mechanical-post-comment, and delegates an explicitly authorized merge or auto-merge to mechanical-merge.

Input

The user invokes this skill with a work-item reference and an optional ship mode:

• #14 or 14 — GitHub issue number
• W-000014 — story ID in the issue title or body
• --ship merge (standalone default) — squash-merge the PR and clean up the worktree
• --ship auto — enable squash auto-merge, stop; worktree stays until merge completes
• --ship pr (orchestrated default) — open the PR and stop; leave the worktree and branch alive so arc-pr-review-loop or an orchestrated review worker can return findings for parent-led review and iteration

If no reference is present, ask for one and stop.

Steps

1. Resolve the GitHub issue.

   • Map #N / N directly to issue N.
   • Map W-XXXXXX by searching open issues for that ID in title or body.
   • Fetch with gh issue view and confirm state is OPEN.

   Completion criterion: you have issue number, title, body, and comments, or you report the issue is missing/closed/ambiguous.

2. Extract the W- ID and branch name.

   • Prefer W-XXXXXX from the issue title; otherwise use issue-<number>.
   • Derive feat/<id>-<short-kebab-slug> from the title.

   Completion criterion: branch name is chosen before git worktree add.

3. Create the worktree.

   • From the repository root, add a new worktree and branch per WORKTREE.md.
   • Treat the worktree path as the sole working directory for all reads, edits, tests, and commits.

   Completion criterion: git worktree list shows the new path on the new branch and your shell cwd is inside it.

4. Ground on existing plan material.

   • Read issue body and comments for an implementation plan or acceptance criteria.
   • If no plan exists and scope is non-trivial, run arc-planning-work in the worktree context before coding.

   Completion criterion: you can state what "done" means from the issue or a posted plan.

5. Implement and verify in the worktree.

   • Make the smallest correct change that satisfies acceptance criteria.
   • Run the repo's test/lint/typecheck commands from the worktree.
   • Under an orchestrator, delegate through the route guidance above, then have the parent inspect the diff and verification before accepting it.

   Completion criterion: tests relevant to the change pass, or you report a concrete blocker before shipping.

6. Commit with Conventional Commits.

   • Follow arc-conventional-commits for type and message format (feat:, fix:, etc.).
   • Use a subject that matches the issue; include Closes #<number> in the commit body.
   • Outside orchestration, stage and commit only issue-scoped files; never commit on the default branch.
   • Under orchestration, the parent stages only the exact issue-scoped file allowlist, then supplies the conventional message to mechanical-commit-push; neither implementation nor review workers run git mutations.

   Completion criterion: the feature branch has at least one conventional commit on the worktree branch.

7. Ship with the selected mode.

   • Write the PR body to a temp file; include Closes #<number> and a change summary.
   • Outside orchestration, run the arc-git-pr-check script from the worktree with the chosen mode: run.sh --ship <merge|auto|pr> --title "<conventional title>" --body-file <path> --staged-only
   • Outside orchestration, do not push, create, or merge the PR with raw gh commands; the script owns those mechanics.
   • Under orchestration, after mechanical-commit-push succeeds, the authorized parent opens the PR directly with gh pr create. Stop there for --ship pr; for an explicitly requested --ship auto or --ship merge, delegate the remaining action to mechanical-merge.

   Completion criterion, by mode — merge: the PR is squash-merged and the linked issue closes; auto: auto-merge is enabled and the PR URL is reported; pr: the PR is open with its URL reported for review. Otherwise report the exact blocker from the selected standalone or orchestrated mechanism.

8. Clean up the worktree (merge mode only).

   • When the PR is merged: from the repository root, remove the worktree, prune stale entries, and delete the local feature branch per WORKTREE.md; return the shell to the main checkout.
   • In pr and auto modes: leave the worktree and branch in place — review iteration happens there — and report the worktree path plus PR URL as the handoff.

   Completion criterion: merged work leaves no worktree behind; unmerged work reports worktree path and PR URL.

Boundaries

• Use arc-planning-work for plan-only requests; this skill implements and ships.
• Use arc-parallel-implement for multiple issues at once.
• Outside orchestration, use arc-git-pr-check for all push/PR/merge mechanics.
• Under orchestration, use mechanical-commit-push, direct parent gh pr create, mechanical-post-comment, and mechanical-merge as specified above; workers never mutate git or GitHub.
• Use arc-pr-review-loop to review and iterate on a PR opened with --ship pr.
• Do not modify files in the main checkout or an unrelated worktree.
• Do not start work on closed issues.
• Do not leave the worktree behind after a successful merge.