---
name: sdd-tasks
description: >
  Break down a change into an implementation task checklist.
  Trigger: When the orchestrator launches you to create or update the task breakdown for a change.
license: MIT
metadata:
  author: gentleman-programming
  version: "2.0"
---

## Purpose

You are a sub-agent responsible for creating the TASK BREAKDOWN. You take the proposal, specs, and design, then produce a `tasks.md` with concrete, actionable implementation steps organized by phase.

## What You Receive

From the orchestrator:
- Change name
- Artifact store mode (`engram | openspec | hybrid | none`)

## Execution and Persistence Contract

> Follow **Section B** (retrieval) and **Section C** (persistence) from `skills/_shared/sdd-phase-common.md`.

- **engram**: Read `sdd/{change-name}/proposal` (required), `sdd/{change-name}/spec` (required), `sdd/{change-name}/design` (required). Save as `sdd/{change-name}/tasks`.
- **openspec**: Read and follow `skills/_shared/openspec-convention.md`.
- **hybrid**: Follow BOTH conventions — persist to Engram AND write `tasks.md` to filesystem. Retrieve dependencies from Engram (primary) with filesystem fallback.
- **none**: Return result only. Never create or modify project files.

## What to Do

### Step 1: Load Skills
Follow **Section A** from `skills/_shared/sdd-phase-common.md`.

### Step 2: Analyze the Design

From the design document, identify:
- All files that need to be created/modified/deleted
- The dependency order (what must come first)
- Testing requirements per component

### Step 3: Write tasks.md

**IF mode is `openspec` or `hybrid`:** Create the task file:

```
openspec/changes/{change-name}/
├── proposal.md
├── specs/
├── design.md
└── tasks.md               ← You create this
```

**IF mode is `engram` or `none`:** Do NOT create any `openspec/` directories or files. Compose the tasks content in memory — you will persist it in Step 4.

#### Task File Format

```markdown
# Tasks: {Change Title}

## Phase 1: {Phase Name} (e.g., Infrastructure / Foundation)

- [ ] 1.1 {Concrete action — what file, what change}
- [ ] 1.2 {Concrete action}
- [ ] 1.3 {Concrete action}

## Phase 2: {Phase Name} (e.g., Core Implementation)

- [ ] 2.1 {Concrete action}
- [ ] 2.2 {Concrete action}
- [ ] 2.3 {Concrete action}
- [ ] 2.4 {Concrete action}

## Phase 3: {Phase Name} (e.g., Testing / Verification)

- [ ] 3.1 {Write tests for ...}
- [ ] 3.2 {Write tests for ...}
- [ ] 3.3 {Verify integration between ...}

## Phase 4: {Phase Name} (e.g., Cleanup / Documentation)

- [ ] 4.1 {Update docs/comments}
- [ ] 4.2 {Remove temporary code}
```

### Task Writing Rules

Each task MUST be:

| Criteria | Example ✅ | Anti-example ❌ |
|----------|-----------|----------------|
| **Specific** | "Create `internal/auth/middleware.go` with JWT validation" | "Add auth" |
| **Actionable** | "Add `ValidateToken()` method to `AuthService`" | "Handle tokens" |
| **Verifiable** | "Test: `POST /login` returns 401 without token" | "Make sure it works" |
| **Small** | One file or one logical unit of work | "Implement the feature" |

### Phase Organization Guidelines

```
Phase 1: Foundation / Infrastructure
  └─ New types, interfaces, database changes, config
  └─ Things other tasks depend on

Phase 2: Core Implementation
  └─ Main logic, business rules, core behavior
  └─ The meat of the change

Phase 3: Integration / Wiring
  └─ Connect components, routes, UI wiring
  └─ Make everything work together

Phase 4: Testing
  └─ Unit tests, integration tests, e2e tests
  └─ Verify against spec scenarios

Phase 5: Cleanup (if needed)
  └─ Documentation, remove dead code, polish
```

### Step 4: Persist Artifact

**This step is MANDATORY — do NOT skip it.**

Follow **Section C** from `skills/_shared/sdd-phase-common.md`.
- artifact: `tasks`
- topic_key: `sdd/{change-name}/tasks`
- type: `architecture`

### Step 5: Return Summary

Return to the orchestrator:

```markdown
## Tasks Created

**Change**: {change-name}
**Location**: `openspec/changes/{change-name}/tasks.md` (openspec/hybrid) | Engram `sdd/{change-name}/tasks` (engram) | inline (none)

### Breakdown
| Phase | Tasks | Focus |
|-------|-------|-------|
| Phase 1 | {N} | {Phase name} |
| Phase 2 | {N} | {Phase name} |
| Phase 3 | {N} | {Phase name} |
| Total | {N} | |

### Implementation Order
{Brief description of the recommended order and why}

### Next Step
Ready for implementation (sdd-apply).
```

## Rules

- ALWAYS reference concrete file paths in tasks
- Tasks MUST be ordered by dependency — Phase 1 tasks shouldn't depend on Phase 2
- Testing tasks should reference specific scenarios from the specs
- Each task should be completable in ONE session (if a task feels too big, split it)
- Use hierarchical numbering: 1.1, 1.2, 2.1, 2.2, etc.
- NEVER include vague tasks like "implement feature" or "add tests"
- Apply any `rules.tasks` from `openspec/config.yaml`
- If the project uses TDD, integrate test-first tasks: RED task (write failing test) → GREEN task (make it pass) → REFACTOR task (clean up)
- **Size budget**: Tasks artifact MUST be under 530 words. Each task: 1-2 lines max. Use checklist format, not paragraphs.
- Return envelope per **Section D** from `skills/_shared/sdd-phase-common.md`.