Project Setup Skill

Trigger: /core-setup [--mode=greenfield|mature|audit|resync|install] [module] [--no-llm] [--scope=<dir>]

--scope=<dir> applies to mature mode only: limits the codebase scan to one directory (monorepo package) — see references/mode-mature.md § Scan budget. Pass through together with --no-llm.

Hub skill that detects what the project needs and loads the appropriate flow. Not global ~/.claude/ setup — that's /core-bootstrap.

"Let Claude decide" Option

Add a final "Let Claude decide" option ONLY to modals that present a genuinely open technical choice — multiple viable options where no single one can be pre-blessed at authoring time (e.g. multi-select stack composition, suggestion sets). It is the steer when the modal has no single "(Recommended)" option.

• Label: "Let Claude decide"
• Description: "Claude picks the best option based on your project context and best practices"

Do NOT add it when the modal already conveys a pick — the two are mutually exclusive:

• A single option is marked "(Recommended)" (e.g. install/skip prompts) — that label IS Claude's pick.
• Detection pre-selected a value (e.g. team/solo mode, module-gap slots) — the detected default is the steer.
• Personal-preference / identity modals: project name, description, language, commit messages.

When selected: pick the best option based on project context and best practices. Display:

CLAUDE'S PICK: {chosen option} — {brief reason}

Modal Option Cap

For dynamic multi-select modals (Audit fixes, Resync drift, Tech stack, Suggestions, Documentation Generators): apply shared/SKILL-PATTERNS.md § Modal Option Cap — the cap is 4 options (tool-enforced maxItems: 4, not a style preference); split into sequential category modals above that, or route to Numbered List Selection when the option count is unbounded/runtime-dependent.

Phase 0: Detect Mode

Before all steps: if ~/.claude/CLAUDE.md is missing, display:

Global bootstrap not done yet. Run /core-bootstrap first to initialize ~/.claude/.

Stop.

0. Check setup-pending marker — if .project/session/setup-pending.json exists and no explicit --mode= flag was passed:

   1. Read marker: mode field determines the destination — greenfield or mature.
   2. Delete marker immediately after reading: rm -f .project/session/setup-pending.json.
   3. Display: project-add handoff — starting {mode} flow directly.
   4. Load references/mode-{mode}.md. Skip steps 1-5.

   If --mode=... flag is present: delete marker (rm -f) but honor the explicit flag.

1. Module arg check — if the invocation includes a non-flag argument (anything not prefixed with --mode= or --no-llm): treat it as module_arg and match (case-insensitive) against tier-1 modules: inspect-overlay, tailwind, shadcn-ui, vitest, playwright, biome, eslint-prettier, zustand, tanstack-query, react-hook-form-zod
   • Match → load references/mode-install.md with direct_module=<module_arg>. Skip steps 2-4.
   • No match → load references/mode-install.md with direct_research=<module_arg> (research path). Skip steps 2-4.
2. Check --mode flag — if provided, skip step 3 and load the corresponding reference directly:
   • --mode=greenfield → references/mode-greenfield.md
   • --mode=mature → references/mode-mature.md (pass through --no-llm flag if present)
   • --mode=audit → references/mode-audit.md
   • --mode=resync → references/mode-resync.md
   • --mode=install → references/mode-install.md

3. Detect existing project — run both scripts in one call:

   MODE=$(python3 ~/.claude/skills/core-setup/scripts/detect-mode.py --path .)
   EXISTING=$(python3 ~/.claude/skills/core-setup/scripts/detect-existing.py --path .)

   MODE is one of greenfield | mature | ambiguous. EXISTING reports whether config files exist (any detected config = "yes" below).

4. Choose mode — the table below is the ONLY routing authority. Match exactly one row on MODE + EXISTING; never override the script output based on your own impression of the project:

   MODE	Existing configs?	Action	User-facing one-liner
   greenfield	no	Load mode-greenfield.md directly	New project — starting setup wizard.
   greenfield	yes	AskUserQuestion: Greenfield wizard / Mature scan / Audit / Resync	Existing project detected — choose below.
   mature	(ignore)	Load mode-mature.md directly	Existing project — scanning codebase.
   ambiguous	(ignore)	AskUserQuestion: Greenfield wizard / Mature scan / Audit	Project state unclear — choose below.

   Reporting rule: show only the one-liner from the table above to the user. No filenames (mode-greenfield.md), no script output, no internal classification terms. Detection details belong in a debug mode, not in the happy path.

   AskUserQuestion for ambiguous / existing configs (single-select):

   • Greenfield wizard — "New project, I want to configure stack and standards" → mode-greenfield.md
   • Mature scan (Recommended for existing project) — "Existing project, scan the codebase and build base memory (incl. Module Gap modal for empty tier-1 slots)" → mode-mature.md
   • Audit — "Check what's missing, no full setup" → mode-audit.md
   • Resync (only for greenfield + existing configs, not for ambiguous) — "Only update CLAUDE.md template sections" → mode-resync.md
5. Load the chosen reference.