maestro-fork

<required_reading> @/.maestro/workflows/run-mode.md @/.maestro/workflows/codex-run-mode.md </required_reading>

<purpose> Create or sync a session-level git worktree for parallel development. Supports `--sync` mode to pull latest main changes into an active worktree. </purpose>

<deferred_reading>

• worktrees.json — read when updating registry
• worktree-scope.json — read when writing scope marker </deferred_reading>

<context> $ARGUMENTS -- session ID (or slug) and optional flags.

Terminology: this command uses 'session' throughout. The underlying workflow file (fork.md) may use 'milestone' as a legacy alias for 'session'. Treat them as equivalent: --session maps to workflow's -m, state.json.sessions[] maps to state.json.milestones[].

--base <ref>: git ref (branch, tag, or commit hash) to fork from. Default: HEAD.

Modes (Fork / Sync), flags (--session, --base, --sync), session resolution, worktree layout, and artifact scoping are defined in workflow fork.md. </context>

<execution> Follow '~/.maestro/workflows/fork.md' completely.

Fork and sync algorithm steps are defined in workflow fork.md.

Gates (MANDATORY, BLOCKING)

Fork mode:

GATE 1: Validation → Worktree Creation

• REQUIRED: Session resolved from state.json.sessions[] by session_id or intent slug.
• REQUIRED: No existing active worktree for this session (E008).
• REQUIRED: Not running inside a worktree (E003).
• BLOCKED if: session not found (E006), already forked (E008), or running inside worktree (E003).

GATE 2: Worktree Creation → Artifact Copy

• REQUIRED: Git worktree created with branch (session/{slug}).
• REQUIRED: Shared .workflow/ files copied (project.md, config.json, specs/).
• BLOCKED if missing: worktree creation failed or shared files not copied — do not proceed to artifact scoping.

GATE 3: Artifact Copy → Completion

• REQUIRED: request_user_input confirmation before registry writes — show session scope, worktree path, and state entries to be written. User must confirm or abort.
• REQUIRED: worktree-scope.json written with session scope (after confirmation).
• REQUIRED: Scoped state.json written (only this session's data) (after confirmation).
• REQUIRED: worktrees.json registry updated in main worktree (after confirmation).
• BLOCKED if missing: scope marker, scoped state, or registry update absent — worktree is unusable without these.

Sync mode:

GATE: Sync → Completion

• REQUIRED: Git merge main into worktree branch completed.
• REQUIRED: Shared artifacts re-copied.
• BLOCKED if: merge has unresolved conflicts or shared artifacts failed to copy.

</execution> <completion> ### Next-step routing

Condition	Suggestion
Fork complete	cd {wt.path}, then route step analyze through /maestro-next or the canonical receipt-chained session open -> session chain insert --command analyze --arg "<goal>" -> run next flow
Fork + automated	maestro delegate "run full lifecycle for session" --cd {wt.path} --mode write
Sync complete	Resume work in worktree
Sync conflicts found	Resolve manually, then retry

</completion>

<error_codes>

Code	Severity	Condition	Recovery
E001	error	Project not initialized	Run maestro-init first
E002	error	No roadmap found	Route step roadmap through /maestro-next or the canonical receipt-chained self-start flow
E003	error	Running inside a worktree	Run from main worktree
E004	error	No session ID provided	Provide --session <session_id>
E005	error	No sessions defined in state.json	Route step roadmap through /maestro-next or the canonical receipt-chained self-start flow
E006	error	Session not found in state.json.sessions[]	Check available sessions
E007	error	No active worktree for session (--sync)	Check worktrees.json
E008	error	Session already has active worktree	Merge or cleanup first
</error_codes>

<success_criteria> Fork mode:

• Session resolved from state.json.sessions[]
• Git worktree created with branch (session/{slug})
• Shared .workflow/ files copied (project.md, config.json, specs/)
• Session artifacts copied (matched by session/milestone name from workflow)
• worktree-scope.json written with session scope
• Scoped state.json written (only this session's data)
• worktrees.json registry updated in main worktree
• Session lifecycle recorded in worktrees.json registry (fork_sessions entry)
• Summary displayed with next-step commands

Sync mode:

• Git merge main into worktree branch
• Shared artifacts re-copied (project.md, config.json, specs/)
• Conflicts reported if any </success_criteria>