# Hdd

> DEPRECATED — use workflow Stage 2 (spec + frontmatter claims). Historical HDD docs are in docs/decisions/archive/.

- Skill: `kastalien-research/hdd` (Agent Skill)
- Install (CLI): `npx skillmds@latest add kastalien-research/hdd`
- Raw SKILL.md: https://api.skillmd.com/api/skills/kastalien-research/hdd/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Productivity
- Author: kastalien-research (https://skillmd.com/u/kastalien-research)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/kastalien-research/hdd

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# HDD (Deprecated)

Hypothesis-Driven Development with ADR lifecycle is retired. Use:

1. **`.claude/skills/workflow/SKILL.md`** — Stage 2 produces or updates `.specs/**/*.md` with YAML frontmatter claims (`.schemas/spec-v1.json`).
2. **PR claims** — `prs/<branch>.json` references `spec_claim_id` as `SPEC-ID:cN`.
3. **Historical ADRs** — `docs/decisions/archive/adr/` (read-only context).

Do not create new files under `.adr/`.