The Default Sandbox Image

Koyeb Sandboxes are currently in public preview.

By default, if no Docker image is specified when creating a sandbox, Koyeb uses a default Ubuntu 22.04–based image with common tools preinstalled:

System utilities: curl, wget, git, jq, zip/unzip, file, procps, ca-certificates
Language runtimes/toolchains: Node.js, Python, Go, Ruby, Rust, Elixir/Erlang, Java, Bun, Deno
AI tooling: Mistral Vibe (opens in a new tab), Codex (opens in a new tab), Gemini (opens in a new tab), and OpenCode (opens in a new tab).

This makes the default image suitable for automation, testing, and code generation workflows without requiring additional setup.

Using AI coding tools with Koyeb Sandboxes

Since the default Koyeb Sandbox image includes support for popular AI coding tools such as Mistral Vibe, Codex, Gemini, and OpenCode, you can immediately start generating and testing code without additional setup. Provide your API keys when creating the sandbox to leverage AI-powered development in a secure, isolated environment.

Using Mistral Vibe CLI in Koyeb Sandboxes

Mistral Vibe (opens in a new tab) is an AI-powered CLI tool that helps you generate, modify, and debug code directly from natural language prompts. Running Mistral Vibe in Koyeb Sandboxes provides an isolated environment for testing AI-generated code safely, making it ideal for prototyping, experimentation, and automated workflows.

To use Mistral Vibe, you'll need a Mistral account and an API key (opens in a new tab).

Set your Mistral API key as an environment variable when creating the sandbox:

sandbox = Sandbox.create(
    wait_ready=True,
    env={
        "MISTRAL_API_KEY": "YOUR_MISTRAL_API_KEY",
    }
)

Use the --prompt flag to execute commands directly without entering the interactive CLI:

result = sandbox.exec(
    "vibe --prompt 'Create a hello world Python app'",
)

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