# ADR-002: Twelve-Head (Dvādaśa) Architecture

## Status
Accepted

## Context
Multi-agent systems typically use 2-5 agents with fixed roles. FusionAGI needed a system that could analyze problems from many perspectives simultaneously while maintaining coherent output.

## Decision
The orchestrator decomposes every query across **12 specialized heads**:

| Head | Role |
|------|------|
| Logic | Logical reasoning and consistency |
| Research | Source evaluation and synthesis |
| Systems | Architecture and integration |
| Strategy | Long-term planning |
| Product | User experience and design |
| Security | Threat analysis |
| Safety | Risk observation (advisory) |
| Reliability | Fault tolerance |
| Cost | Resource optimization |
| Data | Statistical reasoning |
| DevEx | Developer experience |
| Witness | Audit and observation |

The Witness head is special: it observes but doesn't contribute to the consensus.

## Consequences
- Comprehensive analysis from 12 angles on every query
- Higher latency (12 parallel LLM calls) but better quality
- The InsightBus enables cross-head learning
- Each head has a unique color identity in the UI for visual distinction
- The consensus mechanism must handle disagreement gracefully

## Alternatives Considered
1. **3-5 heads** — Rejected: insufficient perspective diversity
2. **Dynamic head count** — Future consideration: some queries don't need all 12
3. **Hierarchical heads** — Rejected: flat structure promotes equal consideration