OpenSandbox CLI

osb is the command-line interface for OpenSandbox. It is built for the common day-to-day flows:

• create and manage sandboxes
• run commands inside a sandbox
• read and modify sandbox files
• inspect runtime egress policy
• collect low-level diagnostics
• install OpenSandbox-specific skills for coding agents

It uses the OpenSandbox Python SDK under the hood and is intended to be the shortest path from a terminal to a working sandbox workflow.

Install

Choose one:

pip install opensandbox-cli

uv tool install opensandbox-cli

pipx install opensandbox-cli

Confirm the install:

osb --help
osb --version

Before You Start

Make sure an OpenSandbox server is reachable. If you are running locally, start the server first and then point the CLI at it.

opensandbox-server

Quick Start

1. Initialize config

osb config init
osb config set connection.domain localhost:8080
osb config set connection.protocol http
osb config set connection.api_key <your-api-key>
osb config show -o json

If you want a non-default config file, choose it at the root command level for the whole invocation:

osb --config /tmp/dev.toml config init
osb --config /tmp/dev.toml config set connection.domain localhost:8080
osb --config /tmp/dev.toml config show -o json

2. Create a sandbox

osb sandbox create --image python:3.12 --timeout 30m -o json

If you set defaults first, later create commands can be shorter:

osb config set defaults.image python:3.12
osb config set defaults.timeout 30m
osb sandbox create -o json

3. Verify it is usable

osb sandbox get <sandbox-id> -o json
osb sandbox health <sandbox-id> -o json

4. Run a command inside the sandbox

Use -- before the sandbox command payload.

osb command run <sandbox-id> -o raw -- python -c "print(1 + 1)"

5. Read or write a file

osb file write <sandbox-id> /workspace/hello.txt -c "hello" -o json
osb file cat <sandbox-id> /workspace/hello.txt -o raw

6. Clean up

osb sandbox kill <sandbox-id> -o json

Common Tasks

Create sandboxes

Basic:

osb sandbox create --image python:3.12

Private image:

osb sandbox create \
  --image my-registry.example.com/team/app:latest \
  --image-auth-username alice \
  --image-auth-password <token>

Manual cleanup mode:

osb sandbox create --image python:3.12 --timeout none

Explicit entrypoint argv:

osb sandbox create \
  --image python:3.12 \
  --entrypoint python \
  --entrypoint -m \
  --entrypoint http.server

Create with network policy and volumes:

osb sandbox create \
  --image python:3.12 \
  --network-policy-file network-policy.json \
  --volumes-file volumes.json

List and inspect sandboxes

osb sandbox list
osb sandbox list -o json
osb sandbox list --state running --state paused
osb sandbox get <sandbox-id> -o json
osb sandbox metrics <sandbox-id>
osb sandbox metrics <sandbox-id> --watch -o raw

Expose a service

osb sandbox endpoint <sandbox-id> --port 8080 -o json

Run commands

Foreground streaming:

osb command run <sandbox-id> -o raw -- sh -lc 'echo ready'

Tracked background execution:

osb command run <sandbox-id> --background -o json -- sh -c "sleep 10; echo done"
osb command status <sandbox-id> <execution-id> -o json
osb command logs <sandbox-id> <execution-id> -o json

Persistent shell session:

osb command session create <sandbox-id> --workdir /workspace -o json
osb command session run <sandbox-id> <session-id> -o raw -- pwd
osb command session run <sandbox-id> <session-id> -o raw -- export FOO=bar
osb command session run <sandbox-id> <session-id> -o raw -- sh -c 'echo $FOO'
osb command session delete <sandbox-id> <session-id> -o json

Work with files

osb file upload <sandbox-id> ./local.txt /workspace/local.txt -o json
osb file download <sandbox-id> /workspace/result.json ./result.json -o json
osb file search <sandbox-id> /workspace --pattern "*.py" -o json
osb file info <sandbox-id> /workspace/main.py -o json
osb file replace <sandbox-id> /workspace/app.py --old old --new new -o json
osb file chmod <sandbox-id> /workspace/script.sh --mode 755 -o json

Manage runtime egress policy

Inspect current policy:

osb egress get <sandbox-id> -o json

Patch specific rules:

osb egress patch <sandbox-id> --rule allow=pypi.org --rule deny=internal.example.com -o json

If you are debugging connectivity, verify behavior with an actual command:

osb command run <sandbox-id> -o raw -- curl -I https://pypi.org

Collect diagnostics

Use the stable diagnostics commands for API-backed log and event descriptors.

osb diagnostics events <sandbox-id> --scope lifecycle -o raw
osb diagnostics events <sandbox-id> --scope runtime -o raw
osb diagnostics logs <sandbox-id> --scope container -o raw
osb diagnostics logs <sandbox-id> --scope lifecycle -o json
osb diagnostics events <sandbox-id> --scope runtime -o json
osb diagnostics logs <sandbox-id> --scope container -o yaml

--scope is required for stable diagnostics. Common scopes are lifecycle and container for logs, and lifecycle and runtime for events. Raw output prints inline diagnostic text, or the content URL when diagnostics are delivered as a temporary URL. Structured CLI output follows the SDK/Python field style, for example content_url, content_length, and expires_at. Some server builds may return DIAGNOSTICS_NOT_IMPLEMENTED for scoped diagnostics until the stable backend implementation is enabled.

Legacy DevOps diagnostics remain experimental. Prefer osb diagnostics logs/events for stable API-backed log and event collection.

osb devops inspect <sandbox-id> -o raw
osb devops summary <sandbox-id> -o raw

Output Formats

Output selection is command-scoped, not global.

• table: human-readable tables and panels
• json: machine-readable JSON
• yaml: machine-readable YAML
• raw: unformatted text or streaming output

Examples:

osb sandbox list -o json
osb sandbox list -o yaml
osb file cat <sandbox-id> /workspace/hello.txt -o raw

Not every command supports every format. Use --help on the specific command when in doubt.

Command Groups

The main command groups are:

• osb sandbox: lifecycle management
• osb command: command execution and persistent sessions
• osb file: file and directory operations
• osb egress: runtime egress policy
• osb diagnostics: stable diagnostics logs and events
• osb devops: experimental legacy diagnostics
• osb config: local CLI configuration
• osb skills: bundled skills for AI tools

Explore them directly:

osb sandbox --help
osb command --help
osb file --help
osb skills --help

Agent Skills

The CLI ships with built-in OpenSandbox skills for coding agents and agent-oriented tools.

Bundled skills:

• sandbox-lifecycle
• command-execution
• file-operations
• network-egress
• sandbox-troubleshooting

Supported targets:

Target	Install location
claude	./.claude/skills/ or ~/.claude/skills/
cursor	./.cursor/rules/ or ~/.cursor/rules/
codex	./.codex/skills/<name>/SKILL.md or ~/.codex/skills/<name>/SKILL.md
copilot	./.github/copilot-instructions.md or ~/.github/copilot-instructions.md
windsurf	./.windsurfrules or ~/.windsurfrules
cline	./.clinerules or ~/.clinerules
opencode	./.agents/skills/<name>/SKILL.md or ~/.agents/skills/<name>/SKILL.md

Common flows:

osb skills list
osb skills show sandbox-lifecycle
osb skills install sandbox-lifecycle --target codex --scope project
osb skills install --all-builtins --target codex --scope global
osb skills uninstall sandbox-troubleshooting --target claude --scope global

For scripts or agents, use structured output:

osb skills install sandbox-lifecycle --target codex --scope project -o json

Configuration Model

The CLI resolves configuration in this order:

1. root CLI flags such as --api-key, --domain, --protocol, --request-timeout, --config
2. environment variables such as OPEN_SANDBOX_API_KEY and OPEN_SANDBOX_DOMAIN
3. config file, defaulting to ~/.opensandbox/config.toml
4. SDK defaults

Config commands:

osb config init
osb config show
osb config set connection.domain localhost:8080
osb config set connection.protocol http
osb config set defaults.image python:3.12
osb config set defaults.timeout 30m

Example config file:

[connection]
api_key = "your-api-key"
domain = "localhost:8080"
protocol = "http"
request_timeout = 30
use_server_proxy = false

[output]
color = true

[defaults]
image = "python:3.12"
timeout = "30m"

Development

For local development in this monorepo:

cd cli
uv sync
uv run osb --help
uv run pytest

This repository uses a local uv source override for the OpenSandbox Python SDK, so running from cli/ will resolve against the checked-out SDK in the monorepo.