@agentkit-js/claude-agent-sdk

@agentkit-js/claude-agent-sdk

Drop agentkit-js sandbox kernels into the Anthropic Claude Agent SDK as native tools. Edge-safe code execution, one CapabilityManifest shared with your MCP servers, no external sandbox provider.

Why this exists

Claude Agent SDK (formerly the Anthropic agent runtime) is Anthropic's first-party way to build agents that target Claude Code, the desktop, or any hosted Claude application. It ships with a clean tool registration model — but no sandbox. If your model generates code, you have to either trust it (don't), spin up a container (latency, ops cost), or write a node:vm shim (bans you from edge runtimes).

This package gives you a ClaudeAgentTool backed by an agentkit kernel (QuickJSKernel, PyodideKernel, WasmtimeKernel, or RemoteSandboxKernel). Pick a tier; pick a manifest; the tool drops straight into the agent SDK's tools array.

Install

npm install @anthropic-ai/sdk @agentkit-js/claude-agent-sdk @agentkit-js/kernel-quickjs \
  quickjs-emscripten @jitl/quickjs-wasmfile-release-sync zod

One-shot snippet evaluation

import { sandboxedJsClaudeTool } from "@agentkit-js/claude-agent-sdk";
import { QuickJSKernel } from "@agentkit-js/kernel-quickjs";

const tool = sandboxedJsClaudeTool({
  kernel: new QuickJSKernel(),
  capabilities: { allowedHosts: ["api.example.com"], cpuMs: 5000 },
});

// Hand the tool to the Claude Agent SDK alongside any other tools.
// The model can now call `evaluate_javascript({ code: "..." })`.

Code-mode: collapse N tools

import { codeModeClaudeTool } from "@agentkit-js/claude-agent-sdk";
import { ToolRegistry } from "@agentkit-js/core";

const tools = new ToolRegistry();
// register your downstream tools here…

const tool = codeModeClaudeTool({
  kernel: new QuickJSKernel(),
  tools,
  capabilities: { allowedHosts: ["api.github.com"] },
});
// The model now sees ONE tool and calls `callTool(...)` from inside scripts.

Capability manifest

Same CapabilityManifest as every other agentkit kernel — see docs/guides/code-mode.md.

See also

• @agentkit-js/aisdk — same kernels for Vercel AI SDK
• @agentkit-js/openai-agents — same kernels for OpenAI Agents JS
• @agentkit-js/mastra-sandbox — same kernels as a Mastra sandbox provider