Brain-Hands Decoupling
Separating the model-and-harness layer that decides what to do from the sandbox, tools, or systems that perform actions.
Plain English
The agent's decision loop does not have to live inside the same container or environment as the code it runs.
Example
A hosted coding agent keeps a durable session log outside the sandbox, then provisions a fresh execution environment only when a tool call needs it.
Why it matters
The split improves durability, scaling, debugging, and credential isolation for long-running agents.