SKILL.md
Checkpoint
Overview
Create a safe, repeatable checkpoint in any git repo. This workflow is swarm-safe: it acquires a lock, validates, stages selected files, commits with strict message rules, and optionally pushes.
Principles
- Automate what is unambiguous; ask when it is not.
- Never switch branches or rewrite history unless explicitly instructed.
- Prefer explicit file selection; avoid "stage everything" by default.
- Abort if the working tree changes mid-run.
Workflow (Swarm-Safe)
1) Acquire Lock
Use a repo-local lock so multiple agents do not collide.
- Lock path:
.git/.checkpoint.lock/ - Create the lock with an atomic
mkdir. If it exists, stop and report. - Write
owner.txtinside the lock with: user, host, pid, time, branch, worktree. - Only break the lock if the user explicitly says "force".
If the lock is present, show owner.txt and stop. Do not proceed unless told to force.
2) Snapshot
- Record
git status -sband a diff summary. - If on
master, warn and ask for confirmation before continuing. - If the working tree changes after this point, abort and report.
3) Validate
Run the repo's standard checks, but do not guess commands.
- Discover validation instructions from repo docs/config (README, CONTRIBUTING, build scripts, CI notes).
- If the repo does not specify validation steps, ask the user to choose or skip.
- If validation fails, fix and re-run before proceeding.
4) Stage
- Show the diff and ask which files to include.
- Stage only the files the user confirms (explicit paths only).
- Re-check
git statusand the diff. If anything changed unexpectedly, abort.
5) Commit
Ask for a commit message and enforce these rules (verbatim):
- Subject <=42 chars (room for
(#NNNN)suffix -> 50 char limit) - Imperative mood ("Add feature" not "Added feature")
- Capitalize subject, no period at end
- Blank line between subject and body
- Body: explain what and why, wrap at 72 chars
- Use backticks around
filenames,paths, andcode_symbols
Use the heredoc pattern:
git commit -m "$(cat <<'EOF'
<Subject line - imperative, <=42 chars>
<Body - what and why, wrapped at 72 chars>
Use `backticks` around files, paths, symbols.
EOF
)"If commit fails:
- No staged changes -> return to Stage
- Hook failure -> fix, re-stage, create a NEW commit (do not amend)
- Other error -> report and stop
6) Push (Optional)
- Ask whether to push unless the user explicitly requested it.
- If pushing: fetch first. If remote advanced or diverged, stop and ask.
- Push only the current branch.
7) Confirm and Release
- Summarize what happened (files staged, commit SHA, push status).
- Remove the lock directory only after completion.
Notes
- No PR or Graphite steps in this skill.
- The lock directory is created by this workflow to prevent collisions; it is safe to remove only when no checkpoint is running.