CodeSandbox

What is CodeSandbox?

CodeSandbox is a cloud development platform for running code in isolated, on-demand “sandboxes.” It lets developers and tools spin up these environments so they can execute code quickly, collaborate, and support workflows that require safe handling of untrusted or dynamically generated code.

The site also positions CodeSandbox as a component for AI workflows: it describes a CodeSandbox SDK for bringing code interpretation to generative AI, and it outlines how sandboxed execution can be used by AI agents to resolve prompts and evaluate code.

Key Features

• Programmatically spin up isolated sandboxes for instant code execution, including use in an AI code playground or agent workflow.
• Secure and isolated environments where each sandbox runs independently, designed to help prevent untrusted code from affecting a developer’s system.
• Scalable VM handling described as support for millions of concurrent VMs, along with the ability to provision, manage, and decommission VMs.
• Continuous development with “snapshots,” enabling users to resume work within the same sandbox after periods of inactivity without loss.
• Fast sandbox operations via microVM infrastructure, including clone and snapshot restore actions described as taking within about 2 seconds.
• Quick start and auto-resume behavior for microVM-based environments, plus customizable hibernation periods for managing what happens during inactivity.
• Support for AI agents: run multiple agents in parallel with isolation, and use a “forking mechanism” for scenarios like A/B testing different agent approaches.
• Development-at-scale workflows such as creating a sandbox per developer or student to run code in parallel without interference.
• Sandboxed code interpretation and evaluation (evals), including running “popular evals” on code pieces.
• CI/CD-oriented usage: run tests inside a sandbox and hibernate the sandbox after tests complete for quicker re-runs.
• Template universe to start from a favorite stack, with an “Explore templates” entry point.

How to Use CodeSandbox

1. Start using CodeSandbox (or integrate it via CodeSandbox SDK if you are building an AI/code execution workflow).
2. Create or choose a template from the template universe to begin with a stack.
3. Run code in an isolated sandbox; when appropriate, use the platform’s continuous context features to resume work via snapshots.
4. For automated workflows, programmatically provision sandboxes to execute or evaluate code, then use hibernation behavior to manage inactivity.

If you are working with AI agents, you can run agents inside sandboxes so they can execute code while staying isolated from the rest of your environment.

Use Cases

• AI agent code execution for prompt resolution: provide an isolated sandbox so an agent can execute code needed to answer user prompts, without cross-contaminating other runs.
• Parallel agent testing: run multiple agents at the same time so they don’t interfere, and use forking to compare different agent configurations (for example, A/B testing).
• Secure evaluation of generated or untrusted code: interpret and run code in an isolated sandbox and perform evals on code artifacts without letting execution impact your system.
• Classroom or cohort coding: create one sandbox per developer or student, enabling multiple environments to run in parallel without interference.
• CI/CD test runs with fast restart: execute tests inside a sandbox and hibernate it afterward so the sandbox can be started again for the next test or evaluation cycle.

FAQ

What does CodeSandbox “sandbox” mean?

In the context of CodeSandbox, a sandbox is an isolated development/execution environment that can be provisioned and used to run code safely, including running code interpretation or tests.

Can I run code that I don’t trust?

The site states that environments run in isolation and that you can run untrusted code without it affecting your system. It also mentions using sandboxes for secure code interpretation and evals.

How does snapshotting help during development?

CodeSandbox describes “snapshots” for continuous context—allowing development to resume within the same sandbox after inactivity without loss.

Can sandboxes be created automatically?

Yes. The site highlights that sandboxes can be spun up programmatically using APIs, including for isolated development environments that can run the needed type of code.

Does CodeSandbox support AI agent workflows?

The page describes using sandboxes for AI agents, including running multiple agents in parallel and using a forking mechanism for A/B testing.

Alternatives

• Cloud IDEs and browser-based development environments: alternatives in this category provide remote coding but may not focus as strongly on sandbox isolation and programmatic sandbox provisioning.
• Local containerized development or execution (e.g., using containers/VMs): this can also isolate executions, but setup and orchestration are typically managed by the user rather than being provided as a managed cloud sandbox platform.
• Serverless code execution platforms: these can run code on demand, but the workflow for continuous context, snapshot-based resume, and multi-agent isolation may differ.
• Build/test infrastructure with ephemeral environments: if your main goal is running tests in isolated environments, you can use CI systems that provision temporary compute, though integration with agent workflows and snapshot-based resume may vary.