Directory / E2B
E2B
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Firecracker microVMs as a sandbox API for AI agents.
E2B provides isolated cloud sandboxes — Firecracker microVMs — via SDK, for running AI-generated code. Sessions are short-lived by default, with pause/snapshot features documented. The infrastructure repo documents self-hosting. The managed product is the common path.
- Model independence
- Multi-model
- Deployment
- Cloud, Self-hosted, BYOC
- Open source
- Yes
- License
- Apache-2.0 (SDKs/infra); managed service is commercial
- Pricing model
- Usage
- Added / updated
- 19 Aug 2026 / 19 Aug 2026
Editorial take
E2B is the default noun for “agent sandbox” in 2026. MicroVMs are the isolation story; session length is the product story. We will not quote cold-start milliseconds we did not measure. BYOC/self-host exists in docs — confirm current support before you promise air-gap.
Strengths
- Documented Firecracker isolation and a simple SDK.
- Built for untrusted generated code, not for humans IDEs.
- Self-host/BYOC paths exist in public engineering docs.
Limitations
- Managed default still sends code to E2B’s cloud.
- Not a coding agent; you bring the harness.
- Vendor and third-party blogs disagree on latency; measure yours.
Compare
- vs daytona — The two sandboxes teams shortlist first for agent code execution.
- vs modal — General GPU/container compute versus an agent-sandbox product.