> ## Documentation Index > Fetch the complete documentation index at: https://isol8.notdhruv.com/llms.txt > Use this file to discover all available pages before exploring further. # Overview > What isol8 includes: secure execution, pooling, network controls, persistence, remote server/client, and observability. **Migration**: CLI is now `@isol8/cli` (installed as `isol8` command), library is `@isol8/core`. isol8 is a secure code execution engine for untrusted code. If you are new to isol8, follow `Quickstart` first, then read `Execution guide` before tuning configuration or performance. ## Why this matters isol8 is built around three priorities that matter in real usage: Warm container pools reduce startup overhead; current warm-pool median TTI is about `0.12s-0.15s` across runtimes. Code runs in isolated containers with strict limits, network controls, and output sanitization by default. Start with a single command, then layer on advanced controls only when you need them. isol8 can be as simple as you want and as complex as you need. ## Core features Run a full coding agent (pi) inside an isol8 sandbox. Give an LLM a filesystem, tools, and controlled network access in a single `execute()` call. Execute Python, Node.js, Bun, Deno, and Bash inside isolated Docker sandboxes. Use ephemeral runs for clean isolation or persistent sessions when you need stateful workflows. Choose pool strategies (`fast`, `secure`) to reduce startup overhead while preserving controls. Enforce filtered networking with proxy rules plus iptables restrictions to prevent bypass. Run isol8 as an HTTP service with streaming execution and session/file APIs. Capture resource and audit logs for visibility, compliance, and incident analysis. Enforce timeouts, memory limits, CPU limits, and process caps for predictable execution. Mask sensitive values in output and cap output volume to reduce leak and overload risk. Install runtime-specific dependencies per execution without managing long-lived environments. Use the same engine through commands, TypeScript APIs, or remote HTTP endpoints. Fetch code from URLs/GitHub/Gists with policy controls and optional hash verification. ## Speed and performance isol8 is designed for low-friction execution loops: * Warm pools reduce container startup overhead for repeated executions. * Pool strategies let you choose between maximum throughput (`fast`) and stronger cleanup guarantees (`secure`). * Setup is idempotent, so image preparation can be safely reused across local runs and CI jobs. Understand tuning knobs, pool behavior, and runtime tradeoffs. Review startup and execution timing data across modes and runtimes. ## Start here Install and run your first execution. Learn request fields, modes, and streaming behavior. See exactly where each option is configured. Fix common runtime and server issues. ## Architecture Internal execution pipeline, pool lifecycle, and security boundaries. ## FAQ Start with Quickstart, then move to How to CLI for flag-level details. Read Execution guide for behavior and lifecycle. Read Option mapping to map each option to CLI, config, API, and library inputs. Use Remote server and client for endpoint usage patterns and request examples. ## Troubleshooting quick checks * **Unsure which page to use**: start from `Quickstart`, then follow the “Next steps” cards on each page. * **Command works differently than expected**: verify where the value is set in Option mapping. * **Execution failures**: use Troubleshooting for symptom-based fixes.