Nm Sanctum Stack Create

Initializes a stacked branch set from an ordered plan, one branch per slice with parent-child links

Night Market Skill — ported from claude-night-market/sanctum. For the full experience with agents, hooks, and commands, install the Claude Code plugin.

Stack Create

Initialize a stacked branch set from a multi-step plan. Each logical slice of the plan becomes one branch targeting the previous slice's branch as its base.

When to Use

Use stack-create when a plan produces 2 or more ordered changes where each change depends on the previous one completing (and merging) before it can land. For independent changes, use parallel worktrees instead (see egregore).

Prerequisites

• Git 2.38+ (git version | awk '{print $3}' to check)
• gh CLI authenticated
• A written plan with ordered slices (from do-issue or attune:blueprint)
• Clean working tree on the base branch (git status)

Required Progress Tracking

Create TodoWrite items before starting:

1. stack-create:git-version-checked
2. stack-create:slices-identified
3. stack-create:branches-created
4. stack-create:stack-verified

Step 1: Verify Git Version (git-version-checked)

git version

Confirm the output is 2.38.0 or higher. If not, the --update-refs flag is unavailable. Warn the user and fall back to manual branch tracking.

Check for optional jj accelerator:

if command -v jj &>/dev/null && jj root &>/dev/null 2>&1; then
  echo "jj available"
else
  echo "using git --update-refs"
fi

Step 2: Identify Slices (slices-identified)

Read the plan and extract ordered slices. Each slice must satisfy:

• A single logical concern (one PR worth of change)
• A clear dependency on the slice before it (if any)
• A short name suitable for a branch suffix

Example slices for a plan with three parts:

Slice 1: add-schema     -- database schema changes
Slice 2: add-api        -- API layer (depends on schema)
Slice 3: add-ui         -- frontend (depends on API)

Record the slice list before creating branches.

Step 3: Create Branches (branches-created)

Starting from the base branch (usually master or main):

BASE=master
STACK=stack/my-feature

# Slice 1 branches from master
git checkout -b ${STACK}/add-schema ${BASE}

# Slice 2 branches from slice 1
git checkout -b ${STACK}/add-api ${STACK}/add-schema

# Slice 3 branches from slice 2
git checkout -b ${STACK}/add-ui ${STACK}/add-api

Convention: stack/<feature-name>/<slice-name>

Return to the first slice branch to begin work:

git checkout ${STACK}/add-schema

jj Accelerator (if available)

# jj creates an empty commit on each branch automatically
# Use jj new to move to a new change
jj new -m "stack: add-schema" --no-edit

Step 4: Verify Stack (stack-verified)

Confirm the branch topology is correct:

git log --oneline --graph \
  ${BASE}..${STACK}/add-ui

Each slice branch should appear as a linear chain above the base.

If jj is available:

jj log --revisions \
  "ancestors(${STACK}/add-ui, 10) & !ancestors(${BASE})"

Notes

• Never push branches until at least one commit exists on each slice (empty branches produce confusing PRs)
• The slice name in the branch becomes the PR title prefix by convention; keep it short and descriptive
• After creating the stack, proceed to stack-push to open PRs, or work slice-by-slice and push when ready
• If the plan changes, add or remove branches manually and re-verify the topology in Step 4