Runtime overview

Substructure separates agent systems into three parts:

• Workers for your agent logic
• Server for orchestration and durability
• Clients for user-facing and backend integrations

This separation keeps your code portable while making execution resilient.

Durable execution

Every decision is persisted so runs can resume safely after crashes and restarts.

Middleware model

Agent capabilities are composed through middleware, so you can add and replace behavior intentionally.