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Claude-Code-Workflow/.codex/skills/parallel-dev-cycle/SKILL.md

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---
name: Parallel Dev Cycle
description: Multi-agent parallel development cycle with requirement analysis, exploration planning, code development, and validation. Supports continuous iteration with markdown progress documentation.
argument-hint: TASK="<task description>" | --cycle-id=<id> [--extend="<extension>"] [--auto] [--parallel=<count>]
---
# Parallel Dev Cycle - Multi-Agent Development Workflow
Multi-agent parallel development cycle using Codex subagent pattern with four specialized workers:
1. **Requirements Analysis & Extension** (RA) - Requirement analysis and self-enhancement
2. **Exploration & Planning** (EP) - Exploration and planning
3. **Code Development** (CD) - Code development with debug strategy support
4. **Validation & Archival Summary** (VAS) - Validation and archival summary
Each agent **maintains one main document** (e.g., requirements.md, plan.json, implementation.md) that is completely rewritten per iteration, plus auxiliary logs (changes.log, debug-log.ndjson) that are append-only. Supports versioning, automatic archival, and complete history tracking.
## Arguments
| Arg | Required | Description |
|-----|----------|-------------|
| TASK | One of TASK or --cycle-id | Task description (for new cycle, mutually exclusive with --cycle-id) |
| --cycle-id | One of TASK or --cycle-id | Existing cycle ID to continue (from API or previous session) |
| --extend | No | Extension description (only valid with --cycle-id) |
| --auto | No | Auto-cycle mode (run all phases sequentially) |
| --parallel | No | Number of parallel agents (default: 4, max: 4) |
## Architecture Overview
```
┌─────────────────────────────────────────────────────────────┐
│ User Input (Task) │
└────────────────────────────┬────────────────────────────────┘
v
┌──────────────────────┐
│ Orchestrator Agent │ (Coordinator)
│ (spawned once) │
└──────────────────────┘
┌────────────────────┼────────────────────┐
│ │ │
v v v
┌────────┐ ┌────────┐ ┌────────┐
│ RA │ │ EP │ │ CD │
│Agent │ │Agent │ │Agent │
└────────┘ └────────┘ └────────┘
│ │ │
└────────────────────┼────────────────────┘
v
┌────────┐
│ VAS │
│ Agent │
└────────┘
v
┌──────────────────────┐
│ Summary Report │
│ & Markdown Docs │
└──────────────────────┘
```
## Key Design Principles
1. **Main Document + Auxiliary Logs**: Each agent maintains one main document (rewritten per iteration) and auxiliary logs (append-only)
2. **Version-Based Overwrite**: Main documents completely rewritten per version; logs append-only
3. **Automatic Archival**: Old main document versions automatically archived to `history/` directory
4. **Complete Audit Trail**: Changes.log (NDJSON) preserves all change history
5. **Parallel Coordination**: Four agents launched simultaneously; coordination via shared state and orchestrator
6. **File References**: Use short file paths instead of content passing
7. **Self-Enhancement**: RA agent proactively extends requirements based on context
## Session Structure
```
.workflow/.cycle/
+-- {cycleId}.json # Master state file
+-- {cycleId}.progress/
+-- ra/
| +-- requirements.md # Current version (complete rewrite)
| +-- changes.log # NDJSON complete history (append-only)
| └-- history/
| +-- requirements-v1.0.0.md # Archived snapshot
| +-- requirements-v1.1.0.md # Archived snapshot
+-- ep/
| +-- exploration.md # Codebase exploration report
| +-- architecture.md # Architecture design
| +-- plan.json # Structured task list (current version)
| +-- changes.log # NDJSON complete history
| └-- history/
| +-- plan-v1.0.0.json
| +-- plan-v1.1.0.json
+-- cd/
| +-- implementation.md # Current version
| +-- debug-log.ndjson # Debug hypothesis tracking
| +-- changes.log # NDJSON complete history
| └-- history/
| +-- implementation-v1.0.0.md
| +-- implementation-v1.1.0.md
+-- vas/
| +-- summary.md # Current version
| +-- changes.log # NDJSON complete history
| └-- history/
| +-- summary-v1.0.0.md
| +-- summary-v1.1.0.md
└-- coordination/
+-- timeline.md # Execution timeline
+-- decisions.log # Decision log
```
## State Management
State schema is defined in [phases/state-schema.md](phases/state-schema.md). The master state file (`{cycleId}.json`) tracks:
- Cycle metadata (id, title, status, iterations)
- Agent states (status, output files, version)
- Shared context (requirements, plan, changes, test results)
- Coordination data (feedback log, decisions, blockers)
## Versioning Workflow
### Initial Version (v1.0.0)
```bash
/parallel-dev-cycle TASK="Implement OAuth login"
```
Generates:
```
requirements.md (v1.0.0)
exploration.md (v1.0.0)
architecture.md (v1.0.0)
plan.json (v1.0.0)
implementation.md (v1.0.0) - if applicable
summary.md (v1.0.0) - if applicable
```
### Iteration Versions (v1.1.0, v1.2.0)
```bash
/parallel-dev-cycle --cycle-id=cycle-v1-xxx --extend="Add GitHub support"
```
**Automatic handling**:
1. Read current `requirements.md (v1.0.0)`
2. Auto-archive to `history/requirements-v1.0.0.md`
3. Recreate `requirements.md (v1.1.0)` - complete overwrite
4. Append changes to `changes.log` (NDJSON)
## Changes.log Format (NDJSON)
Permanent audit log (append-only, never deleted):
```jsonl
{"timestamp":"2026-01-22T10:00:00+08:00","version":"1.0.0","agent":"ra","action":"create","change":"Initial requirements","iteration":1}
{"timestamp":"2026-01-22T11:00:00+08:00","version":"1.1.0","agent":"ra","action":"update","change":"Added Google OAuth requirement","iteration":2}
{"timestamp":"2026-01-22T11:30:00+08:00","version":"1.0.0","agent":"ep","action":"create","change":"Initial implementation plan","iteration":1}
```
## Usage
```bash
# Start new cycle
/parallel-dev-cycle TASK="Implement real-time notifications"
# Continue cycle
/parallel-dev-cycle --cycle-id=cycle-v1-20260122-abc123
# Iteration with extension
/parallel-dev-cycle --cycle-id=cycle-v1-20260122-abc123 --extend="Also add email notifications"
# Auto mode
/parallel-dev-cycle --auto TASK="Add OAuth authentication"
```
## Key Benefits
- **Simple**: Each agent maintains only 1 file + changes.log
- **Efficient**: Version rewrite without complex version marking
- **Traceable**: Complete history in `history/` and `changes.log`
- **Fast**: Agent reads current version quickly (no history parsing needed)
- **Auditable**: NDJSON changes.log fully traces every change
- **Self-Enhancing**: RA agent proactively extends requirements
- **Debug-Ready**: CD agent supports hypothesis-driven debugging
## Reference Documents
| Document | Purpose |
|----------|---------|
| [phases/orchestrator.md](phases/orchestrator.md) | Orchestrator logic |
| [phases/state-schema.md](phases/state-schema.md) | State structure definition |
| [phases/agents/](phases/agents/) | Four agent role definitions |
| [specs/coordination-protocol.md](specs/coordination-protocol.md) | Communication protocol |
| [specs/versioning-strategy.md](specs/versioning-strategy.md) | Version management |