---
title: "Our mission · Reactor · Selan"
description: "Why Reactor is lots of small agents with one job each, what every Reactor feature has to keep true, and what is built so far."
url: https://selan.ai/reactor/mission
updated: 2026-10-18T23:03:43+03:00
---

Reactor · our mission

# Micro agents that maintain and build your system _while you sleep._

Lots of small agents, each with one job, working through the night. In the morning, people review what they did and decide what ships.

Why

## A lot of engineering happens when nobody is at the keyboard.

Checking an environment after a deploy, triaging what came in overnight, answering an event as it arrives. A Claude Code session on a laptop stops when the laptop does, and an agent nobody is watching cannot stop halfway to ask a question. So the routine part waits for someone to remember it.

Why micro

## Twenty small agents are easier to trust than one big one.

An agent with one job has a prompt you can read in a minute. It needs only the connectors that job uses, and it can often run on a cheaper model. When it gets something wrong, its transcript shows where, and Revert puts the last good version back.

What we hold to

## What every Reactor feature has to keep true.

### People set the direction.

A person decides what each agent is for and reviews what it hands back. Even a supervisor acts as the person who turned it on, and that person's own change takes control back.

### You can see everything an agent does.

Every agent is a card on a canvas, every run has a transcript, and every change to an agent is a version you can revert.

### You can see what the work costs.

Every run records its cost and tokens, and a supervisor's default mission is to make its workspace cheaper without doing less.

Where we are

> Triggers, memory, workspaces and supervisors are built. Next is a fleet that looks after a whole codebase.

Built

#### Triggers and memory

Agents that start themselves and remember the last run.

Built

#### Workspaces and groups

A fleet you can see, sorted by team and by job.

Built

#### Supervisors

An agent that tunes the others in its workspace.

Next

#### Whole codebases

Fleets that keep a system current and working, with people steering.

## Want your codebases kept by a fleet?

[Get early access](https://selan.ai/contact)[See Reactor](https://selan.ai/reactor)