# ADR-0005: Use Independent Worker Processes And NDJSON IPC

- Status: Accepted
- Date: 2026-05-27

## Context

A single agent process doing all work would cause context explosion, reduce responsiveness, and make parallel execution fragile. AirCoding needs workers that can be monitored, retried, cancelled, and recovered independently.

## Decision

Run Executor, Reviewer, Debugger, Compactor, and ExperienceMiner as independent Bun child processes. Use NDJSON over stdio for IPC.

IPC messages use:

```text
kind: event
kind: control
kind: log
```

The Scheduler owns process lifecycle, heartbeat monitoring, timeout handling, and WorkerResult collection.

## Consequences

- Main Agent remains responsive.
- Workers have bounded task context.
- Scheduler can detect lost workers through heartbeat/process state.
- stdout is reserved for protocol; stderr is crash/fatal fallback.
- Worker loops may be role-specific rather than one generic shared loop.