# Core Lifecycle

> Enforces the six-step lifecycle with mandatory checkpoints and transition criteria.

- Skill: `duck4nh/core-lifecycle` (Agent Skill)
- Install (CLI): `npx skillmds@latest add duck4nh/core-lifecycle`
- Raw SKILL.md: https://api.skillmd.com/api/skills/duck4nh/core-lifecycle/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- License: MIT
- Author: duck4nh (https://skillmd.com/u/duck4nh)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/duck4nh/core-lifecycle

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# Lifecycle Core

## Flow
`VISION -> CONTEXT -> BLUEPRINT -> CONTRACT -> BUILD -> REFINE`

## Transition Rules
- 1->2: vision proposed with layout/style/stack.
- 2->3: context captured and applied.
- 3->4: blueprint approved and frozen.
- 4->5: contract confirmed and scope locked.
- 5->6: build runs and core functionality works.

## Block Conditions
- Missing approval at any checkpoint.
- Major change request after blueprint freeze.

## Required Outputs
- Stage summary and next allowed action.