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Sandbox Worker Harness

Sandbox Worker extends Worker and requires a full sandbox: a container or a managed provider such as Daytona, E2B or Modal. The Agent’s Sandbox policy chooses which one.

Namesandbox-worker
Parentworker
Sandbox policyRequired; must name a container or managed Sandbox Template
Primary SandboxWhatever the Agent’s policy selects

Use it for coding agents, data work that installs packages, browser automation and long builds. The Coding harness example builds on it.

Sandbox Worker never falls back to Bashkit:

  • Saving an Agent whose Sandbox policy can only resolve to Bashkit is rejected.
  • An Agent with no Sandbox policy saves, but starting a Session on it fails with a message that names the missing policy.

Choose Bashkit Worker for a virtual shell that needs no provider. Custom Harnesses that inherit from Sandbox Worker inherit the requirement too.

Sandbox Worker is a Platform harness. In the Framework, express the same need as an Environment requirement on your harness and bind an Environment that provides it.

See Sandbox Templates for configuring providers.