# Nerve Architecture

Observation engine for autonomous agents — sense the world, react to changes, run workflows.

## Core Pipeline

```
External World → Sense → Signal → Reflex → Workflow → Log
```

Causality is **one-directional**. Logs are the end of the chain — they cannot trigger Reflexes (prevents feedback loops).

## Three Orthogonal Extension Points

| Extension | Question | Nature |
|-----------|----------|--------|
| **Sense** | What to compute | `compute()` function |
| **Reflex** | When to compute | Declarative YAML (interval / on) |
| **Workflow** | What to do | Roles + Moderator |

Each is independent. Reflex doesn't know compute internals, Sense doesn't know when it's triggered, Workflow doesn't know why it was started.

## Two Event Types

- **Signal** — from Sense compute (non-null return). Pure fact, no intent. Drives the front half (perception).
- **Command Event** — inside Workflow Threads. Has causal chain, must be responded to. Drives the back half (action).

## Process Isolation

- One worker per Sense group (long-lived)
- One worker per Workflow type (on-demand)
- Workers never talk to each other
- All user code runs in isolated Workers; kernel never loads user code directly