phase-2-breakdown

name	phase-2-breakdown
description	Break down PRD into atomic, testable tasks using CLI for modular storage
allowed-tools	["Read","Write","Bash","AskUserQuestion"]
user-invocable	false

Phase 2: Task Breakdown

Goal

Break down the PRD into atomic, testable tasks (each <30 minutes), create task files via CLI, and get user approval before implementation.

Input

• PRD file: .ralph-dev/prd.md
• Language config from CLI (if available)

---

Workflow

Step 0: Initialize CLI (Automatic)

IMPORTANT: This skill requires the Ralph-dev CLI. It will build automatically on first use.

# Bootstrap CLI - runs automatically, builds if needed
source ${CLAUDE_PLUGIN_ROOT}/shared/bootstrap-cli.sh

# Verify CLI is ready
ralph-dev --version

# Context-compression resilience: Verify current phase
CURRENT_PHASE=$(ralph-dev state get --json 2>/dev/null | jq -r '.phase // "none"')
echo "Current phase: $CURRENT_PHASE"
# Expected: breakdown

Step 1: Verify Prerequisites

# Ensure .ralph-dev is gitignored (add if missing)
git check-ignore -q .ralph-dev 2>/dev/null || {
  echo ".ralph-dev/" >> .gitignore
  git add .gitignore && git commit -m "chore: gitignore .ralph-dev temp files"
}

# Verify PRD exists
[ -f ".ralph-dev/prd.md" ] || { echo "ERROR: PRD not found"; exit 1; }

Step 2: Read and Analyze PRD

Read .ralph-dev/prd.md and extract:

• User stories from each Epic
• Technical requirements
• Architecture components

Step 3: Create Atomic Tasks

For each user story, create 1-3 tasks following these rules:

Task Breakdown Rules:

• Each task completable in <30 minutes
• Each task has clear, testable acceptance criteria
• Tasks follow dependency order
• Group related tasks into modules

Task Naming Convention: {module}.{feature}.{aspect}

• Example: auth.signup.ui, auth.signup.api, auth.signup.tests

Step 4: Create Tasks via CLI (Sequential)

CRITICAL: Create tasks one at a time for context-compression resilience.

CRITICAL — write the FULL enriched body, not just a description. Every task MUST carry the complete 8-section contract (see Task File Format below). Author it into a temporary Markdown file and pass it with --body-file, so the contract is preserved verbatim and reaches the implementer in Phase 3. A bare --description task is the thin version the system must refuse to ship.

# Initialize tasks
ralph-dev tasks init --project-goal "..." --language "..."

# For each task: write the enriched 8-section body to a temp file …
BODY_FILE="$(mktemp -t ralph-task.XXXXXX.md)"
cat > "$BODY_FILE" <<'EOF'
# {Task Title}

## Context
{Why this task exists and where it fits in the system}

## Spec Basis
{Cite the PRD or design-doc clauses this task implements}

## Interface / Contract
{Inputs, outputs, type signatures, error returns}

## TDD
{The failing tests to write first and the cases to cover}

## Edge Cases & Failure Modes
{Boundary conditions, concurrency, errors, rollback}

## Files Touched
{Files to be created or modified}

## Definition of Done
{Verifiable definition-of-done checklist}

## Acceptance Criteria
1. {Testable criterion}
2. {Testable criterion}
EOF

# … then create the task with the body attached (one at a time, not batched)
ralph-dev tasks create \
  --id "{module}.{feature}" \
  --module "{module}" \
  --priority {N} \
  --estimated-minutes {M} \
  --description "{one-line summary}" \
  --criteria "Criterion 1" \
  --criteria "Criterion 2" \
  --body-file "$BODY_FILE" \
  --json

rm -f "$BODY_FILE"

# Verify creation
ralph-dev tasks list --json

The --criteria flags still populate the indexed projection (used for quick listing). The ## Acceptance Criteria section in the body should mirror them.

Step 5: Show Task Plan for Approval

Display the task plan and ask for user approval:

📋 Task Plan

**Total Tasks**: {N} tasks
**Estimated Time**: {X} hours

## Tasks by Module
### Module: {name} (Priority {range})
1. [P{n}] {task.id} - {description} ({minutes} min)
...

Use AskUserQuestion tool:

• Question: "Do you approve this task breakdown?"
• Options: "Yes, proceed", "Modify first", "Cancel"
• Add "(Recommended)" to suggested option based on task quality

Step 6: Handle Response & Update State

case "$ANSWER" in
  "Yes, proceed"*)
    ralph-dev state update --phase implement
    ;;
  "Modify first"*)
    echo "Edit files in: .ralph-dev/tasks/"
    echo "Resume with: /ralph-dev resume"
    exit 0
    ;;
  "Cancel"*)
    ralph-dev state clear
    exit 1
    ;;
esac

Step 7: Return Result

REQUIRED Output Format:

---PHASE RESULT---
phase: breakdown
status: complete
tasks_created: {N}
tasks_dir: .ralph-dev/tasks
estimated_hours: {X}
next_phase: implement
---END PHASE RESULT---

---

Task File Format

Tasks use an 8-section contract. The frontmatter is managed by the CLI and regenerated on every status change; the body below it is author-owned and preserved verbatim — status transitions never wipe it.

---
id: {module}.{task-name}
module: {module-name}
priority: {number}
status: pending
estimatedMinutes: {number}
dependencies: [{task-ids}]
---
# {Task Title}

## Context
{Why this task exists and where it fits in the system}

## Spec Basis
{Cite the PRD or design-doc clauses this task implements}

## Interface / Contract
{Inputs, outputs, type signatures, error returns}

## TDD
{The failing tests to write first and the cases to cover}

## Edge Cases & Failure Modes
{Boundary conditions, concurrency, errors, rollback}

## Files Touched
{Files to be created or modified}

## Definition of Done
{Verifiable definition-of-done checklist}

## Acceptance Criteria
1. {Testable criterion}
2. {Testable criterion}

How it is persisted: author this body into a temp file and pass it via ralph-dev tasks create --body-file <path> (see Step 4). The CLI stores it verbatim; tasks start/done/fail only rewrite the frontmatter, so the enriched sections survive the full task lifecycle.

---

Tool Constraints

AskUserQuestion

• Max 4 questions per call
• header: ≤12 chars (e.g., "Approval")
• Add "(Recommended)" to suggested option

---

Constraints

• NEVER create tasks >30 minutes
• NEVER batch task creation in memory (context-compression vulnerability)
• ALWAYS verify task creation via CLI after each create
• ALWAYS get user approval before transitioning to implement
• ALWAYS return structured PHASE RESULT block

---

Error Handling

Error	Action
PRD not found	Fail, prompt to run Phase 1
Task creation fails	Retry once, then report error
User rejects plan	Save state, allow manual editing