Documentation

Everything you need to run JavaScript in Cloudflare isolates. From quick starts to deep dives on architecture and the HTTP API.

Quick Start

Install

Deploy the public app, private Worker, and backing Cloudflare resources.

Tutorial

Install, connect your agent, run code, see the result.

Compose

Skip ahead and start building in the browser.

Guides

Self-Hosting

ProductionCloudflare

Deploy the public app, private Worker, and backing Cloudflare resources.

HTTP API

RESTJSON

Run modes, endpoints, curl, request/response shapes.

Agents

MCPAI

stdio MCP find + execute, or GET /lab/catalog + HTTP runs.

FAQ

FAQAI

Agents, sandbox, saved results, limits, why edge — for AI-curious SWEs.

TypeScript Client

npmTypeScript

@acoyfellow/lab — install, createLabClient, methods.

Agent Patterns

AgentPatterns

Prove it, self-heal, handoff, canary — saved results as the protocol.

When to use Lab

Product

Good fit vs poor fit; relationship to plain Workers.

Reference

Architecture

CloudflareEffect

Worker loaders, Effect, KV snapshot, spawn, chains.

Capabilities

Security

Registry-backed capability IDs, denied errors, and runtime semantics.

Saved Result Schema

Schema

Saved-result JSON, viewer semantics, and `resultId`.

Limits

Reference

Repo-enforced caps, chains, R2 invoke, platform limits.

Security model

Reference

Untrusted guest code, capabilities, operators.

Failures & step data

Reference

Chain errors, partial-or-empty step data on failure, isolate reasons.