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Onyx
Onyx is a MCP (Model Context Protocol) server that executes code securely inside Docker sandboxes. It supports multiple programming languages and integrates seamlessly with Claude Desktop or other MCP clients. Onyx makes it safe and easy to execute arbitrary code in a sandboxed MCP environment.
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claudedockermcpsandbox
Quality signals
StaleNo testsNo CIThin docsNo licenseNew
InstallMCPRun inside a container
Universal installANY TOOL
$ npx skillcity@latest avd1729/OnyxAuto-detects the skill or MCP server in this repo and installs it for Claude Code, Codex, Cursor, Cline, OpenCode, Gemini CLI, Anti-Gravity, OpenClaw and Hermes.
Requires Node.js 18+ (ships with npx).
Or install manually
docker run -i --rm onyx
MCP Configuration
Add this to your claude_desktop_config.json
{
"mcpServers": {
"onyx": {
"command": "docker",
"args": [
"run",
"-i",
"--rm",
"onyx"
]
}
}
}Loading README…
Ask a simulated agent to run this skill. It loads the real SKILL.md and reasons over your task with NVIDIA.
onyx — sandboxAI sandbox
Pick a quick prompt below or type your own — watch the agent execute this skill step by step.
guest@skillcity:~$Try a prompt