| name | aid-tech-spec |
| description | AID Phase 2 - Technical Specification. Use for system architecture, API contracts, data models, security architecture, transitioning from PRD to implementation. |
Tech Spec Phase Skill
Phase Overview
Purpose: Design technical solution. Create blueprint developers can follow without ambiguity.
Entry: PRD approved, requirements clear, dependencies identified
Exit: Tech spec complete, architecture documented, API contracts defined, data models specified
Deliverables
- Tech Spec Document - Implementation-ready design
- Architecture Diagram - Components and interactions
- API Contracts - Endpoints, schemas, errors
- Data Models - Schemas, types, constraints
Common Pitfalls
| Pitfall | Fix |
|---|
| Over-engineering | Design for current needs |
| Missing error handling | Define errors upfront |
| Tight coupling | Design for testability |
| Ignoring non-functionals | Address performance, security |
| Unclear contracts | APIs unambiguous with examples |
Phase Gate Checklist
Tech Spec Template
# [Feature] Technical Specification
## 1. Overview
### Problem Summary
### Proposed Solution
### Key Decisions
| Decision | Choice | Rationale |
## 2. Architecture
### System Diagram
[Mermaid or image]
### Component Breakdown
| Component | Responsibility | Dependencies |
### Data Flow
## 3. API Design
### POST /api/[resource]
**Request:**
```json
{ "field": "type" }
Response (200):
{ "id": "string" }
Errors:
| Code | Error | Description |
4. Data Model
Entity: [Name]
| Field | Type | Constraints | Description |
5. Security
Authentication
Authorization
Data Protection
6. Error Handling
| Scenario | Response | Recovery |
7. Non-Functional Requirements
| Requirement | Target | Measurement |
8. Risks & Mitigations
| Risk | Impact | Mitigation |
## Role Guidance
| Role | Focus |
|------|-------|
| PM | Validate approach addresses requirements |
| Dev | Own spec, design for testability |
| QA | Review testability, integration points |
| Tech Lead | Review architecture, approve direction |
## Handoff to Implementation
- Approved tech spec
- API contracts
- Data models
- Architecture decisions with rationale
- Spike/POC results (if any)
Save to: `docs/tech-spec/YYYY-MM-DD-[feature].md`