jj Workflow Skill | Agent Skills

jj Workflow

CRITICAL: Avoid Interactive Mode

Always use -m flag to prevent jj from opening an editor:

# WRONG - opens editor, blocks AI
jj new
jj describe
jj squash

# CORRECT - non-interactive
jj new -m "message"
jj describe -m "message"
jj squash -m "message"

Never use these interactive commands:

jj split - inherently interactive, no non-interactive mode

Mental Model

No staging area. Your working directory is always a commit. Every save is tracked.

@ = your current change (the working copy)
@- = parent of current change
Changes are mutable until pushed

When to Use What

| Situation | Do This | | --------------------------- | --------------------------------------------------------- | | Starting new work | jj new -m "what I'm trying" | | Forgot to start with jj new | jj describe -m "what I'm doing" (do this immediately) | | Work is done, move on | jj new -m "next task" | | Annotate what you did | jj describe -m "feat: auth" | | Broke something | jj op log → jj op restore <id> | | Undo one file | jj restore --from @- <path> | | Combine messy commits | jj squash -m "combined message" | | Try something risky | jj new -m "experiment", then jj abandon @ if it fails |

AI Coding Pattern

Always have a description. The working copy should never stay "(no description set)".

# BEFORE starting work - declare intent
jj new -m "feat: add user logout button"
# Now implement... jj tracks everything automatically

# FORGOT to start with jj new? Describe immediately
jj describe -m "feat: what I'm working on"

Why this matters:

jj log shows meaningful history while working
Easier to understand what each change does
Simpler to curate/squash later
Teammates can follow progress

# Checkpoint before risky changes
jj describe -m "checkpoint: auth works"
jj new -m "trying OAuth integration"

# If it breaks
jj op log              # Find good state
jj op restore <id>     # Go back

# When done, curate history
jj squash -m "feat: OAuth support"

Push to GitHub

Pushed commits are immutable. You can't squash into or modify them. The safe pattern:

# 1. Abandon empty checkpoint commits cluttering history
jj log -r '::@'                      # Find checkpoints
jj abandon <change-ids>              # Remove empty ones

# 2. Describe your work (don't try to squash into immutable parent)
jj describe -m "feat: what you did"

# 3. Move bookmark to your commit and push
jj bookmark set master -r @
jj git push

For feature branches (new):

jj bookmark create feature-x -r @
jj git push --bookmark feature-x
# If refused, configure auto-tracking once:
jj config set --user 'remotes.origin.auto-track-bookmarks' 'glob:*'
# Then retry: jj git push --bookmark feature-x

For feature branches (updating):

jj bookmark set feature-x -r @
jj git push

Teammates see clean git. They don't know you used jj.

Recovery

The oplog records every operation. Nothing is lost.

jj op log                      # See all operations
jj undo                        # Undo last operation
jj op restore <id>             # Jump to any past state

Bail Out

rm -rf .jj    # Delete jj, keep git unchanged

Agent Skills: jj Workflow

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