Rn harness spec

rn-harness-spec — Phase 2.5: Spec Planning

Breaks down the PRD into file-level task checklists under docs/specs/, organized by feature and implementation phase. Sits between Plan (Phase 2) and Design (Phase 3).

Trigger

Called by the orchestrator after Phase 2 (Plan) completes.

Input

• docs/harness/plans/YYYY-MM-DD-prd.md (PRD from Phase 2)
• docs/harness/config.md

Process

Step 1: Extract Feature List

Read the PRD and extract the full list of features to implement. Map each feature to the FSD module structure defined in the PRD (features/, entities/, widgets/, shared/).

Sort features by priority:

• P0 features first (MVP required)
• P1 features next (important)
• P2 features last (future roadmap)

Step 2: Create Feature Spec Directories

For each feature, create a numbered directory under docs/specs/:

docs/specs/
├── 01-auth/
├── 02-home/
├── 03-profile/
├── ...
└── README.md

The NN prefix reflects implementation priority order (01, 02, 03...).

Step 3: Generate Phase Files

Inside each feature directory, create phase markdown files:

docs/specs/01-auth/
├── phase1-mvp.md           # Core MVP functionality
├── phase2-enhancement.md   # Enhancements and extensions
└── phase3-polish.md        # Optimization and polish (if needed)

Phase breakdown rules:

• Phase 1 (MVP): Minimum viable implementation — types, API, store, core UI, screen, barrel export
• Phase 2 (Enhancement): Extended features — validation, error states, loading states, edge cases
• Phase 3 (Polish): Optimization — animations, accessibility, performance tuning

P0 features should have at least Phase 1 and Phase 2. P1 features may only have Phase 1. P2 features are documented but not given phase files (noted in README as future scope).

Step 4: Write Tasks in Checkbox Format

Each phase file must follow this exact structure:

---
feature: auth
phase: 1
title: MVP - Authentication
status: not-started
created: YYYY-MM-DD
updated: YYYY-MM-DD
---

# Phase 1: MVP - Authentication

## Tasks

### Entity Setup
- [ ] `src/entities/user/types/index.ts` — IUser interface definition
- [ ] `src/entities/user/store/index.ts` — Zustand user store

### Feature Implementation
- [ ] `src/features/auth/api/auth.api.ts` — Login/signup API calls
- [ ] `src/features/auth/hooks/useLogin.ts` — Login mutation hook
- [ ] `src/features/auth/hooks/useRegister.ts` — Signup mutation hook
- [ ] `src/features/auth/store/index.ts` — Token management store
- [ ] `src/features/auth/ui/LoginForm.tsx` — Login form component
- [ ] `src/features/auth/types/index.ts` — Auth-related types
- [ ] `src/features/auth/index.ts` — Barrel export

### Screen Implementation
- [ ] `app/(auth)/login.tsx` — Login screen
- [ ] `app/(auth)/register.tsx` — Register screen

### QA
- [ ] typecheck passes
- [ ] lint passes
- [ ] feature functions correctly

Task format rules:

• Every task line starts with - [ ]
• File path in backticks, followed by — (em dash) and a brief description
• Group tasks by FSD layer: Entity Setup, Feature Implementation, Screen Implementation, Widget (if applicable), Shared (if applicable)
• Always end each phase with a QA section

Step 5: Generate Progress Dashboard

Create docs/specs/README.md as a progress dashboard:

# Spec Dashboard

> Generated: YYYY-MM-DD
> Source PRD: docs/harness/plans/YYYY-MM-DD-prd.md

## Progress Overview

| # | Feature | Phase 1 | Phase 2 | Phase 3 | Status |
|---|---------|---------|---------|---------|--------|
| 01 | auth | 0/12 | 0/8 | - | not-started |
| 02 | home | 0/9 | 0/5 | - | not-started |
| 03 | profile | 0/7 | - | - | not-started |

## Feature Details

### 01-auth
- Phase 1: MVP - Authentication (12 tasks)
- Phase 2: Enhancement - Auth polish (8 tasks)

### 02-home
- Phase 1: MVP - Home feed (9 tasks)
- Phase 2: Enhancement - Feed optimization (5 tasks)

...

## Future Scope (P2)
- [ ] Feature X — deferred to post-launch
- [ ] Feature Y — deferred to post-launch

Step 6: User Confirmation

Present the spec structure summary via AskUserQuestion:

• Total number of features and tasks
• Phase breakdown per feature
• Estimated scope
• Ask for adjustments before proceeding

Spec Frontmatter Schema

---
feature: {feature-name}        # Matches directory name (without NN prefix)
phase: {1|2|3}                 # Implementation phase
title: {phase title}           # Human-readable title
status: {not-started|in-progress|completed}
created: {YYYY-MM-DD}
updated: {YYYY-MM-DD}
---

Checkbox Update Rules (Phase 5: Generator)

During Phase 5 (Generator), as the Generator implements each file:

1. Update the corresponding task: - [ ] to - [x]
2. Update the frontmatter updated date
3. When all tasks in a phase are checked, set status: completed
4. Update docs/specs/README.md dashboard counts (e.g., 3/12)
5. Update dashboard status column based on progress:
   • not-started — 0 tasks completed
   • in-progress — at least 1 task completed
   • completed — all tasks completed

Output

docs/specs/
├── 01-{feature}/
│   ├── phase1-mvp.md
│   ├── phase2-enhancement.md
│   └── phase3-polish.md (optional)
├── 02-{feature}/
│   ├── phase1-mvp.md
│   └── phase2-enhancement.md
├── ...
└── README.md

State Update

current_phase: design
next_role: rn-harness-design

HARD GATES

• Every task must include a file path — no vague descriptions like "implement auth"
• File paths must follow FSD layer conventions (features/, entities/, shared/, widgets/)
• YAML frontmatter required on every phase file
• README.md dashboard must be generated
• QA section required in every phase file
• User confirmation required before proceeding to Phase 3
• P0 features must have at minimum Phase 1 tasks defined