E2B Sandbox

E2B provides cloud-based code execution sandboxes. The E2BSandboxTool allows LLM agents to safely execute code — each call creates an isolated sandbox, runs the code, and destroys the environment.

Setup

[dependencies]
synaptic = { version = "0.4", features = ["e2b"] }

Get an API key from e2b.dev.

Usage

use synaptic::e2b::{E2BConfig, E2BSandboxTool};
use synaptic::core::Tool;
use serde_json::json;

let config = E2BConfig::new("your-api-key")
    .with_template("python")
    .with_timeout(30);
let tool = E2BSandboxTool::new(config);

let result = tool.call(json!({
    "code": "print(sum(range(1, 101)))",
    "language": "python"
})).await?;
// {"stdout": "5050\n", "stderr": "", "exit_code": 0}

Configuration

Supported Languages

Notes

• Each tool call creates a fresh sandbox and destroys it after execution, ensuring isolation.
• The sandbox is always destroyed even if code execution fails.
• Network access inside the sandbox depends on the E2B template configuration.