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E2B E2B provides hosted micro-VM sandboxes purpose-built for executing AI-generated code. Phoenix uses E2B as a hosted backend for Python code evaluators, giving each invocation a fresh VM with kernel-level isolation, runtime dependency installation, and opt-in outbound network access — without exposing the rest of your deployment.

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Configure

  1. Sign up at e2b.dev and create an API key.
  2. Add it as E2B_API_KEY from Settings → Sandboxes.
See Settings → Sandboxes → E2B for full configuration details and Sandbox Backends for self-hosting setup.