vcs-detect

检测当前项目是采用 jj（柔术）还是 Git 进行版本控制。在执行任何 VCS 命令之前，务必运行此工具，以确保选用正确的版本控制工具。

SKILL.md

--- frontmatter

name: vcs-detect
description: Detect whether the current project uses jj (Jujutsu) or git for version control. Run this BEFORE any VCS command to use the correct tool.

VCS Detection Skill

Detect the version control system in use before running any VCS commands.

Why This Matters

•jj (Jujutsu) and git have different CLIs and workflows
•Running git commands in a jj repo (or vice versa) causes errors
•Some repos use jj with git colocated (both .jj/ and .git/ exist)

Detection Logic

Both jj root and git rev-parse --show-toplevel walk up the filesystem to find repo root.

Priority order:

•jj root succeeds → jj (handles colocated too)
•git rev-parse succeeds → git
•Both fail → no VCS

Detection Command

bash

if jj root &>/dev/null; then echo "jj"
elif git rev-parse --show-toplevel &>/dev/null; then echo "git"
else echo "none"
fi

Command Mappings

Operation	git	jj
Status	`git status`	`jj status`
Log	`git log`	`jj log`
Diff	`git diff`	`jj diff`
Commit	`git commit`	`jj commit` / `jj describe`
Branch list	`git branch`	`jj branch list`
New branch	`git checkout -b <name>`	`jj branch create <name>`
Push	`git push`	`jj git push`
Pull/Fetch	`git pull` / `git fetch`	`jj git fetch`
Rebase	`git rebase`	`jj rebase`

Usage

Before any VCS operation:

•Run detection command
•Use appropriate CLI based on result
•If none, warn user directory is not version controlled

Example Integration

code

User: Show me the git log
Agent: [Runs detection] -> Result: jj
Agent: [Runs `jj log` instead of `git log`]

Colocated Repos

When both .jj/ and .git/ exist, the repo is "colocated":

•jj manages the working copy
•git is available for compatibility (GitHub, etc.)
•Always prefer jj commands in colocated repos