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Vercel Sandbox

On-demand isolated Linux microVMs for running untrusted or AI-generated code

Vercel Sandbox runs arbitrary code in on-demand Firecracker microVMs, each with its own kernel, controlled through an SDK or CLI. Claude, Codex and OpenCode come preinstalled in the base image, so coding agents can run inside a sandbox. It has egress policies with credential injection on outbound requests, snapshots that can start parallel instances, sessions up to 24 hours on paid plans, and persistent Vercel Drives.

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E2B

Open-source sandboxes for running AI-generated code.

E2B gives agents secure, isolated cloud micro-VMs to execute code and commands — the execution runtime layer of the harness, used by many coding and data-analysis agents.

Elastic sandboxes for running AI-generated code.

Daytona provides secure, OCI-compatible sandbox 'computers' that spin up in under 90ms — with snapshots for persistent agent state. In 2026 it moved core development to a private codebase while continuing to run as a commercial platform.

Featured

The open platform for cloud coding agents.

OpenHands (formerly All Hands AI, born from the OpenDevin project) builds the major open-source coding-agent platform — agent canvas, sandboxed execution, SDK and an enterprise control plane — now rebranded under the project's name.

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Relations from the Harness Hub knowledge graph, as charted in the State of Harness reports.

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