SKILL.md

name: jj description: Jujutsu (jj) version control workflows and commands. Use this skill when working with jj repositories, managing changes, squashing commits, rebasing, or performing jj-specific operations.

Jujutsu (jj) Version Control

Agent Usage

When reading data from jj, always use --ignore-working-copy to avoid snapshotting the working copy (which is slow and unnecessary for read operations).

Non-interactive Commands (Critical)

Many jj commands spawn $EDITOR or interactive diff tools by default. These will hang indefinitely when run by agents. Always use the non-interactive alternatives:

Command	Problem	Solution
`jj describe`	Opens editor	Always use `-m "message"`
`jj commit`	Opens editor	Always use `-m "message"`
`jj split`	Opens diff editor + may open editor for description	Provide filesets to select files; use `-m` for description
`jj squash`	May open editor for combined description	Use `-m "message"` or `-u` (use destination message)

Commands to avoid entirely (no non-interactive mode):

jj diffedit — use jj restore or edit files directly instead
jj config edit — use jj config set <key> <value> instead
jj sparse edit — use jj sparse set --add <path> or --remove <path> instead
jj resolve — edit conflict markers directly in files, or use --tool :ours / --tool :theirs

Agent-Friendly Output Formats

jj's default diff and conflict formats differ from Git's. For easier parsing, use Git-compatible formats:

Diffs: Use the --git flag for unified diff output:

jj diff --git
jj log -p --git
jj show --git

Conflicts: jj uses diff-based conflict markers by default (%%%%%%%, +++++++). For standard Git-style markers (<<<<<<<, =======, >>>>>>>), pass --config when running commands that may create conflicts:

jj --config ui.conflict-marker-style=git rebase ...
jj --config ui.conflict-marker-style=git new --insert-before ...

The conflict style is applied when conflicts are materialized to the working copy, so the config must be set before the conflict occurs.

JSON: For structured/programmatic output, use the json(self) template:

jj log --ignore-working-copy --no-graph -T 'json(self) ++ "\n"'

Outputs one JSON object per line with commit_id, change_id, description, author, etc. Works with jj log, jj show, and other commands that support -T.

Common Commands

Command	Description
`jj status`	Show working copy status
`jj log`	Show commit history
`jj new`	Create a new change
`jj describe -m "msg"`	Set commit message
`jj squash`	Squash into parent
`jj diff`	Show changes
`jj git push`	Push to remote
`jj git fetch`	Fetch from remote
`jj bookmark create name`	Create a bookmark

Topics

In-depth guides on jj concepts and syntax.

Command Reference

Documentation generated from jj manpages. For details on any command, read the corresponding reference file.

Bisect

jj-bisect-run

Bookmark

Config

File

General

Gerrit

jj-gerrit-upload

Git

Operation

Simplify

jj-simplify-parents

Sparse

Tag

Util

Workspace

Generated from jj manpages (jj 0.37.0)

License

The content in the references/ directory is derived from the jj (Jujutsu) project and is licensed under the Apache License 2.0.

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