adr

name	adr
description	Document architectural decisions using ADR format. Use during research when choosing approaches, introducing deps/patterns, or changing arch.

ADR Skill

Capture the why, not just the what. Institutional knowledge persists across conversations.

When to Invoke

• Research phase: significant arch decision
• User requests decision documentation
• Choosing between 2+ viable approaches
• New dependency or pattern
• Changing existing architecture

Storage

docs/decisions/
├── 0001-use-postgresql-for-storage.md
├── 0002-adopt-feature-based-structure.md
└── NNNN-short-title.md

Template

# NNNN. Short Title

**Date:** YYYY-MM-DD
**Status:** Proposed | Accepted | Deprecated | Superseded by NNNN

## Context
What issue motivates this decision? Constraints, requirements, context.

## Options Considered

### Option A: {name}
- **Pros:** ...
- **Cons:** ...
- **Effort:** Low/Medium/High

### Option B: {name}
- **Pros:** ...
- **Cons:** ...
- **Effort:** Low/Medium/High

## Decision
We chose **Option X** because...

## Consequences

### Positive
- What becomes easier/possible

### Negative
- What becomes harder
- Tech debt (if any)

### Risks
- What could go wrong
- Mitigation strategies

## Related
- Links to rules, ADRs, resources

Guidelines

1. Number sequentially (check existing)
2. Short, descriptive titles
3. Status: Proposed → Accepted → Deprecated/Superseded
4. Never delete — mark Superseded by NNNN
5. Use sequential-thinking for complex trade-offs

Compliance

• Architectural Patterns GEMINI.md § Architectural Patterns
• Core Design GEMINI.md § Core Design Principles
• Project Structure GEMINI.md § Project Structure