Execute JavaScript or Python code in an isolated sandbox. Use for: data processing, math, CSV parsing, JSON transformation, crypto calculations, algorithm testing. Secure — no filesystem access, no network. Returns: { output: string, runtime_ms: number, language: string }. Requires API key.
Risk signalsAccepts freeform code/query input (code)
Part of the x711 — Universal Agent Gas Station server.
Free to start. No card required.
AI agents invoke x711_code_sandbox to trigger processes or run actions in x711 — Universal Agent Gas Station. Execute operations can have side effects beyond the immediate call -- triggering builds, sending notifications, or starting workflows. Rate limits and argument validation are essential to prevent runaway execution.
x711_code_sandbox can trigger processes with real-world consequences. An uncontrolled agent might start dozens of builds, send mass notifications, or kick off expensive compute jobs. PolicyLayer enforces rate limits and validates arguments to keep execution within safe bounds.
Execute tools trigger processes. Rate-limit and validate arguments to prevent unintended side effects.
{
"version": "1",
"default": "deny",
"tools": {
"x711_code_sandbox": {
"limits": [
{
"counter": "x711_code_sandbox_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}See the full x711 — Universal Agent Gas Station policy for all 47 tools.
These attack patterns abuse exactly the kind of access x711_code_sandbox gives an agent. Each links to the full case and the policy that stops it:
Other execute tools across the catalogue. The same approach applies to each: rate-limit and validate the arguments.
Execute JavaScript or Python code in an isolated sandbox. Use for: data processing, math, CSV parsing, JSON transformation, crypto calculations, algorithm testing. Secure — no filesystem access, no network. Returns: { output: string, runtime_ms: number, language: string }. Requires API key.. It is categorised as a Execute tool in the x711 — Universal Agent Gas Station MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the x711 — Universal Agent Gas Station MCP server in PolicyLayer and add a rule for x711_code_sandbox: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches x711 — Universal Agent Gas Station. Nothing to install.
x711_code_sandbox is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the x711_code_sandbox rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for x711_code_sandbox. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
x711_code_sandbox is provided by the x711 — Universal Agent Gas Station MCP server (https://x711.io/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 47 x711 — Universal Agent Gas Station tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
4,600+ MCP servers and 31,000+ tools scanned and risk-classified.