Spec Driven Development

Spec-Driven Development Integration

After Phase 3 (Planning) produces API contracts and a coding sequence, this skill generates a specs/ directory compatible with /orchestrate and /implement workflows.

When to Use

Invoke after Phase 3 approval when the user wants to:

• Hand off implementation to /orchestrate for parallel execution
• Generate a structured spec for /implement to follow
• Create a standalone design document for external teams

Output Structure

Generate specs/[project-name]/ with:

specs/[project-name]/
├── design.md              # Architecture overview + key decisions
├── api-contracts.md       # Copy of 03-api-planning/api-contracts.md
├── modules.md             # Module list with file ownership
├── implementation-order.md # From coding-sequence.md
└── constraints.md         # Non-standard paths, API quirks, env vars

design.md Template

# [Project Name] - Design Specification

## Overview
[One paragraph from Phase 1 vision statement]

## Architecture
[Pattern chosen in Phase 2 with rationale]

## Modules

| Module | Purpose | Owner | Files |
|--------|---------|-------|-------|
| [name] | [purpose] | [agent/unassigned] | [file paths] |

## Key Decisions
| ID | Decision | Rationale | Source |
|----|----------|-----------|--------|
| D001 | [decision] | [why] | [URL] |

## Constraints
- [Non-standard paths]
- [API quirks]
- [Required environment variables]

modules.md Template

# Module Ownership

> ONE FILE = ONE OWNER. No shared ownership.

| File Path | Module | Owner | Status |
|-----------|--------|-------|--------|
| src/auth/middleware.ts | Auth | unassigned | pending |
| src/users/controller.ts | Users | unassigned | pending |

Generation Steps

1. Read 01-discovery/outline-v1.md for vision
2. Read 01-discovery/decisions-log.md for key decisions
3. Read 02-structure/module-hierarchy.md for module list
4. Read 03-api-planning/api-contracts.md for API specs
5. Read 03-api-planning/coding-sequence.md for implementation order
6. Read 00-project-state.json for critical details
7. Generate all spec files

Compatibility

The generated specs are compatible with:

• /orchestrate - reads modules.md for file ownership, implementation-order.md for sequencing
• /implement - reads design.md for architecture context, api-contracts.md for endpoints
• External teams - standalone documentation that doesn't require framework-dev plugin

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