/sdd.plan

Create an implementation plan.

Usage

/sdd.plan [feature-id]

Arguments

Argument	Description
feature-id	Feature ID (defaults to most recently written spec if omitted)

Behavior

The AI creates a technical implementation plan:

1. Analyze the spec
2. Derive technical decisions
3. Define implementation phases
4. Risk analysis

Generated File

.sdd/specs/<feature-id>/plan.md

Example

/sdd.plan user-auth

AI: Analyzing user-auth spec to create implementation plan.

    Technical Decisions:
    - JWT library: jsonwebtoken
    - Password hashing: bcrypt
    - Token storage: httpOnly cookies

    Implementation Phases:
    1. Define data model
    2. Implement authentication service
    3. Implement API endpoints
    4. Implement middleware

Generated plan.md

---
spec_id: user-auth
created: 2025-12-24
---

# Implementation Plan: user-auth

## Technical Decisions

| Item | Choice | Rationale |
|------|--------|-----------|
| JWT library | jsonwebtoken | Widely used, stable |
| Password hashing | bcrypt | Industry standard |

## Implementation Phases

### Phase 1: Data Model
- Define User schema
- Write migrations

### Phase 2: Authentication Service
- Login logic
- Token generation/validation

## Risks

| Risk | Impact | Mitigation Strategy |
|------|--------|---------------------|
| Token theft | High | Short expiration time, refresh token |

Next Steps

After creating the plan:

/sdd.tasks  -> Task breakdown