An open-source all-purpose TypeScript agent harness. Embed a full agent loop — tools, sessions, permissions, streaming events, subagents — into any Node.js or Bun application with a single import.

Runs on Node.js 18+ and Bun 1.1+. ESM-only.

Full documentation: https://skawld.com/docs

# pick your package manager
# Bun is reccomended
bun add @skawld/agent-sdk
# npm is also supported
npm install @skawld/agent-sdk
pnpm add @skawld/agent-sdk
yarn add @skawld/agent-sdk

Minimal usage

import { Agent } from "@skawld/agent-sdk";
import { AnthropicProvider } from "@skawld/agent-sdk/providers";
import { defaultTools } from "@skawld/agent-sdk/tools";

const agent = new Agent({
  provider: new AnthropicProvider(),   // reads ANTHROPIC_API_KEY from env
  model: "claude-opus-4-5",
  tools: defaultTools(),
  permissions: { mode: "default" },
});

const session = await agent.session();

for await (const event of session.run("List the files in the current directory.")) {
  if (event.type === "assistant") {
    for (const block of event.message.content) {
      if (block.type === "text") process.stdout.write(block.text);
    }
  }
  if (event.type === "result") break;
}

await agent.close();

See examples/minimal-agent.ts for a complete runnable version.

Interactive CLI example

examples/interactive-cli.ts is a small REPL that streams agent events, renders subagent activity in live boxes, and runs in yolo permission mode against the OpenAIResponsesProvider.

Setup:

export OPENAI_API_KEY=sk-...
# optional overrides
export SKAWLD_MODEL=gpt-5            # default: gpt-5
export SKAWLD_CONFIG_DIR=./.skawld   # default: ./.skawld

Run:

bun run examples/interactive-cli.ts

On startup it prompts for a working directory (defaults to the current one), then accepts free-form messages. Type /exit or press Ctrl+C to quit.

Providers

Provider class	Subpath	Environment variable
`AnthropicProvider`	`@skawld/agent-sdk/providers`	`ANTHROPIC_API_KEY`
`OpenAIChatCompletionsProvider`	`@skawld/agent-sdk/providers`	`OPENAI_API_KEY`
`OpenAIResponsesProvider`	`@skawld/agent-sdk/providers`	`OPENAI_API_KEY`

import {
  AnthropicProvider,
  OpenAIChatCompletionsProvider,
  OpenAIResponsesProvider,
} from "@skawld/agent-sdk/providers";

Environment variables

Variable	Used by
`ANTHROPIC_API_KEY`	`AnthropicProvider` (falls back to SDK default lookup)
`OPENAI_API_KEY`	`OpenAIChatCompletionsProvider`, `OpenAIResponsesProvider`

Sessions

By default, sessions persist to SQLite at .skawld/sessions.db. For tests or embedded applications, pass a custom sessionStore, such as InMemorySessionStore.

import { Agent } from "@skawld/agent-sdk";
import { InMemorySessionStore } from "@skawld/agent-sdk/sessions";

const agent = new Agent({
  provider,
  model,
  sessionStore: new InMemorySessionStore(),
});

Public API surface

@skawld/agent-sdk             → Agent, Session, defaultTools, MCP helpers, core types, Event types, Error classes
@skawld/agent-sdk/providers   → AnthropicProvider, OpenAIChatCompletionsProvider, OpenAIResponsesProvider, BaseProvider
@skawld/agent-sdk/tools       → ToolRegistry, defaultTools, built-in tool classes, MCP tool helpers, task types
@skawld/agent-sdk/sessions    → SqliteSessionStore, InMemorySessionStore, SessionStore and task persistence types
@skawld/agent-sdk/permissions → PermissionEngine, permission callback types, permission rule types