# Ca Decompose > Greenfield decomposition interview — a layered interview that populates .codearbiter/ and locks it initialized. - Skill: `majiayu000/ca-decompose` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds add majiayu000/ca-decompose` - Raw SKILL.md: https://api.skillmd.com/api/skills/majiayu000/ca-decompose/raw - Safety review: pending - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Coding & Dev Tools - Author: majiayu000 (https://skillmd.com/u/majiayu000) - Updated: 2026-09-09 - Page: https://skillmd.com/skills/majiayu000/ca-decompose --- # /ca-decompose — greenfield populate Stands up project state for a greenfield project — one with no meaningful source code yet. A senior-architect persona drives a six-layer interview eliciting purpose, scope, primary users, domain vocabulary, and architectural constraints, persisting each layer to disk so a context reset loses nothing, then writes the surviving `.codearbiter/` doc set and locks the project initialized. No arguments — the skill interviews the user (a handoff summary may be supplied freely during the interview). The only permitted path to populate `.codearbiter/` when no meaningful source exists. For an existing codebase, use `/ca-create-context`. ## Routes to The `decompose` skill (`/routines/decompose/SKILL.md`) — six gated phases: pre-flight, persona adoption, layered interview, synthesis, population, lock. The skill is canonical for the layers and their gates. ## When NOT to use - Project already initialized (`` in `CONTEXT.md`) → `/ca-status`. - Existing codebase with source present → `/ca-create-context`. - `.codearbiter/` not yet scaffolded → `/ca-init` first. - Update one doc → edit `/.codearbiter/` directly or use `/ca-feature`. ## Hard gate BLOCK if `` is already present in `CONTEXT.md`. BLOCK if meaningful source is detected (route to `/ca-create-context`). BLOCK if any `[CONFIRM-NN]` exits synthesis unresolved and undeferred. MUST NOT write `` until every required doc is present and non-empty.