review-git

name	review-git
description	Review git conventions — commit messages, PR titles, branch model, and content date integrity. Auto-invoked during PR and commit workflows.
argument-hint	[PR number, commit range, or branch to review]
user-invocable	true
allowed-tools	Read, Grep, Glob, Bash

Review git practices against team conventions covering commit messages, PR standards, branch model, and content date integrity. Every check is concrete and verifiable.

Mandatory Process

Execute all five passes. Every finding requires the specific commit hash or PR field that violates the convention.

Pass 1: Conventional Commits Format

Every commit message must follow the Conventional Commits specification.

1. Format check — get all commit messages in scope:

   git log --oneline [range]
   

   Each commit must match: <type>[optional scope]: <description>

2. Valid types — the type must be one of:

   Type	When to use
   feat	New feature visible to users
   fix	Bug fix
   docs	Documentation only
   style	Formatting, whitespace, semicolons — no logic change
   refactor	Code change that neither fixes a bug nor adds a feature
   test	Adding or updating tests
   chore	Build process, tooling, dependencies
   ci	CI/CD configuration
   perf	Performance improvement
   build	Build system or external dependency changes
   revert	Reverts a previous commit

   Anything else (update, change, wip, misc, stuff) is a finding.

3. Imperative mood — the description uses imperative: "Add feature" not "Added feature", "Adds feature", or "Adding feature":

   git log --format='%s' [range]
   

   Check each subject line. Common violations:

   • Past tense: "Fixed", "Updated", "Changed", "Removed"
   • Third person: "Fixes", "Updates", "Adds"
   • Gerund: "Fixing", "Updating", "Adding"

4. Subject line length — must be under 70 characters:

   git log --format='%s' [range] | awk 'length > 70'
   

   Any output is a finding.

5. No period at end — subject lines must not end with a period.

6. Body separation — if the commit has a body, a blank line must separate it from the subject. Check with:

   git log --format='%B' [range]
   

7. Detail in the body — for non-trivial commits, the body should explain WHY, not WHAT. The diff shows what changed. The body explains the reasoning, tradeoffs, or context that the diff cannot convey.

8. Breaking changes — breaking changes must use either ! after the type/scope or a BREAKING CHANGE: footer:

   • feat!: remove deprecated API
   • Or in the footer: BREAKING CHANGE: the /v1/users endpoint no longer accepts...

Pass 2: PR Title and Description

1. PR title format — must match conventional commit format. The PR title becomes the squash commit message, so it must be valid:

   gh pr view --json title
   

   Apply the same type, imperative mood, and length rules from Pass 1.

2. One concern per PR — a PR that touches unrelated systems is a finding. Signs of a multi-concern PR:

   • Title uses "and" to describe two separate things
   • Changes span multiple feature areas with no shared dependency
   • The diff could be split into independent PRs that each make sense alone

3. Description completeness — the PR description must include:

   • What changed: summary of the modification
   • Why: the motivation or problem being solved
   • Test plan: how to verify the changes work (manual steps, test commands, or "covered by CI")

   Missing any of these three sections is a finding.

4. Linked issues — if the project uses issue tracking, the PR should reference the relevant issue (Closes #123, Fixes #456). Not mandatory, but flag if there is no reference and the change is non-trivial.

Pass 3: Branch Model

1. Squash merges only — the project uses squash merges for linear history. Check for merge commits:

   git log --merges [range]
   

   Merge commits on the main branch (except from the initial repo setup) are findings.

2. No force push to shared branches — grep the reflog or check CI for force-push events. Force pushing to main, develop, or any shared branch is a critical finding. Force pushing to a personal feature branch is acceptable.

3. Branch naming — feature branches should follow a convention:

   • feat/description or feature/description
   • fix/description or bugfix/description
   • chore/description
   • docs/description

   Branch names using the developer's name (martin/fix-thing) are acceptable as an alternative.

   Check the current branch name:

   git branch --show-current
   

4. Branch freshness — if the branch is more than 5 days behind the base branch, note it as a suggestion. Stale branches accumulate merge conflicts.

5. Rebase over merge to update — when a feature branch is behind main, the convention is to rebase, not to merge main into the feature branch. Merge commits from main into a feature branch are findings:

   git log --oneline --merges [branch] ^main
   

Pass 4: Content Date Preservation

This matters for content-heavy repositories (blogs, documentation sites, changelogs).

1. Publication dates — if the diff modifies content files (markdown, MDX, YAML frontmatter), check whether publication dates or date fields were changed:

   git diff [range] -- '*.md' '*.mdx' | grep '^[+-]date:'
   

   Changing a publication date to today's date when only editing content (not republishing) is a finding. Preserve the original publication date.

2. Last-modified dates — if the content system uses lastModified or updated fields, those SHOULD be updated when content changes. Not updating lastModified is a finding.

3. Changelog entries — new changelog entries should use today's date. Backdating changelog entries is a finding.

Pass 5: Commit Hygiene

1. WIP commits — commits with "wip", "work in progress", "temp", "TODO" in the message are findings if they are going to be merged (not squashed away):

   git log --format='%s' [range] | grep -i 'wip\|work in progress\|temp\|fixup\|squash'
   

   In a squash-merge workflow, these are acceptable in the branch history but must not survive as the final squash commit message.

2. Empty commits — commits with no file changes:

   git log --format='%H' [range] | while read h; do [ $(git diff-tree --no-commit-id --name-only -r $h | wc -l) -eq 0 ] && echo "Empty: $h"; done
   

3. Large files — new binary files or files over 1MB:

   git diff --stat [range] | grep -E '\d{4,} insertions'
   

   Large files should use Git LFS or be excluded.

4. Sensitive data — grep the diff for patterns that suggest committed secrets:

   git diff [range] | grep -iE 'password|secret|api_key|token|private_key|AWS_|GITHUB_TOKEN'
   

   Any hit requires manual verification. If it is a real secret, the commit must be amended and the secret rotated.

Evidence Format

### [SEVERITY] [Pass]: [Short description]

**Commit:** `abc1234` or **PR field:** title/description
**Evidence:** [the actual message or diff output]
**Convention:** [which rule is violated]
**Fix:** [concrete rewording or action]

Output Template

## Git Review

### Summary
- Commits reviewed: N
- Commit format: X findings
- PR standards: X findings
- Branch model: X findings
- Content dates: X findings (or N/A)
- Commit hygiene: X findings

### Findings
[grouped by severity: critical, important, suggestion]

### Clean Areas
[what was done well]

Zero-Finding Gate

If all conventions are followed: "No findings. Git review complete — all commits and PR metadata follow team conventions." Do not manufacture findings.

Related Skills

• /coding-standards:review-standards — cross-cutting quality and writing style checks. Complements git convention review.
• Language-specific reviews (/coding-standards:review-dotnet, /coding-standards:review-python, /coding-standards:review-typescript) — run alongside for code quality checks.