SKILL.md

name: git-commit description: Commit with clear messages explaining WHY, following repository conventions

Git Commit

Iron Law

NO COMMITS WITHOUT REVIEWING GIT DIFF FIRST
NO COMMIT MESSAGES WITHOUT EXPLAINING WHY
ONLY COMMIT WHEN USER EXPLICITLY REQUESTS

Process

1. Gather Context (parallel)

git status                    # Staged/unstaged files
git diff                      # Unstaged changes
git diff --staged             # Staged changes
git log --oneline -5          # Recent commit style

2. Review Changes

Understand every change in diff
No secrets (.env, credentials, keys)
No debug code, console.logs
Related changes only (one logical unit)

3. Stage and Commit

git add path/to/file1 path/to/file2

git commit -m "$(cat <<'EOF'
feat: add user authentication middleware

Previous implementation left API endpoints unprotected. Adds JWT
validation middleware ensuring only authenticated requests reach
protected endpoints.
EOF
)"

4. Verify

git status        # Working tree state
git log -1 --stat # Confirm commit

Message Format

<type>: <subject - imperative mood, 50 chars>

<body - explain WHY, wrap at 72 chars>

Types: feat: fix: refactor: docs: test: chore:

Subject: Imperative mood ("Add" not "Added"), no period, ≤50 chars

Body: Explain WHY, what problem it solves, non-obvious decisions

Pre-commit Hook Changes

If hooks modify files:

Check authorship: git log -1 --format='%an %ae'
Check not pushed: git status shows "ahead"
If both true: git add <files> && git commit --amend --no-edit
Otherwise: Create NEW commit

Safety Rules

Never without explicit request:

--force, --force-with-lease
--amend on others' commits or pushed commits
--no-verify, --no-gpg-sign
git reset --hard
git config changes

Never commit:

.env, credentials, secrets, keys
Broken code (tests must pass)
Unrelated changes mixed together

Examples

fix: prevent race condition in session creation

Sessions were created before user validation completed, allowing
invalid users to briefly access protected resources. Moves session
creation to after validation succeeds.

refactor: extract validation using Replace Conditional with Polymorphism

Payment processor had 4-level nested conditionals. Applied Fowler's
pattern to create PaymentMethod interface. New payment types now
require zero changes to processor.

Key Takeaways

Review diff before committing - Never commit unread code
Explain WHY, not WHAT - Diff shows what; message explains why
One logical change per commit - Multiple files OK if related
Only commit when requested - Don't be proactive
Use heredoc for messages - Ensures proper formatting

スコア

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50/100

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