Open-source backend
01Inspect, self-host, customize, and extend the backend your agents depend on instead of building on a closed black box.
An open-source backend for managed agents. Choose your LLM provider, run the agent engine you trust, and execute sessions on Sandbox0 with persistent workspaces, isolation, tool events, and runtime control.
Start with the Claude Managed Agents API/SDK model when you want speed. Drop down to Sandbox0 when you need direct control over sandboxes, files, processes, volumes, networking, and runtime state.
Create agents, define environments, start sessions, stream events, and handle tool actions through a Claude Managed Agents-compatible backend.
Use Sandbox0 APIs directly when production agents need isolated execution, persistent workspaces, file I/O, process control, volume snapshots, or network policy.
Use the managed-agents abstraction when you want velocity. Keep the open backend and sandbox controls when your agent moves toward production.
Inspect, self-host, customize, and extend the backend your agents depend on instead of building on a closed black box.
Use the Claude Managed Agents model developers already know: agents, environments, sessions, events, and tools.
Avoid one-provider lock-in. Run managed agents with the model that fits your latency, cost, policy, and quality needs.
Run Claude Agent SDK today, formerly Claude Code SDK, with Codex SDK support planned next behind the same backend model.
Agent developers need more than model calls. Sandbox0 provides the backend pieces that make long-running agents stateful, inspectable, secure, and ready for real workloads.
Keep long-running agent work alive across turns with session state, streamed events, and resumable backend control.
Preserve repositories, files, caches, artifacts, and checkpoints so agents do not restart from an empty directory every run.
Run sessions on Sandbox0 with isolated runtimes, file I/O, process control, volumes, snapshots, and network policy.
Stream user turns, model output, tool calls, tool results, status changes, and action requests through one agent backend.
Keep secrets out of untrusted agent code with runtime controls designed for governed network access and credential injection.
Designed to grow from single sessions into workflows, approvals, scheduling, retries, and multi-agent coordination.
Use Sandbox0 Managed Agents when you want the high-level Claude Managed Agents API/SDK model: agents, environments, sessions, events, tools, resources, and action handling.
Choose the LLM provider and agent engine that fit your workload. Sandbox0 Managed Agents supports Claude Agent SDK today, with Codex SDK support planned next.
When you need lower-level control, use Sandbox0 directly for sandbox lifecycle, process execution, file I/O, persistent volumes, snapshots, network policy, and credential-safe runtime control.
Create agents, environments, sessions, and event streams with a Claude Managed Agents-compatible API/SDK surface.
Choose your LLM provider and agent engine instead of locking every agent to one hosted runtime or one model vendor.
Run sessions on Sandbox0 when your agent needs persistent files, real processes, network boundaries, and recoverable state.
We're onboarding teams building production agents. Join the waitlist for Sandbox0 Managed Agents and the hosted cloud version.