@ag-ui/claude-agent-sdk

Implementation of the AG-UI protocol for the Anthropic Claude Agent SDK (TypeScript).

Installation

npm install @ag-ui/claude-agent-sdk @anthropic-ai/claude-agent-sdk zod

Usage

The adapter manages the SDK lifecycle internally — just call adapter.run(input):

import { ClaudeAgentAdapter } from "@ag-ui/claude-agent-sdk";

const adapter = new ClaudeAgentAdapter({
  agentId: "my_agent",
  model: "claude-haiku-4-5",
  systemPrompt: "You are helpful",
});

const events$ = adapter.run(input);
events$.subscribe({
  next: (event) => sendEvent(event),
  complete: () => res.end(),
});

Features

• Full lifecycle management - Handles message extraction, option building, and SDK querying internally
• Interrupt support - Call adapter.interrupt() to stop a running query
• Dynamic frontend tools - Client-provided tools automatically added as MCP server
• Frontend tool halting - Streams pause after frontend tool calls for client-side execution (human-in-the-loop)
• Streaming tool arguments - Real-time TOOL_CALL_ARGS emission as JSON arguments stream in
• Bidirectional state sync - Shared state management via ag_ui_update_state tool
• Context injection - Context and state injected into prompts for agent awareness
• Event cleanup - Hanging events (tool calls, reasoning blocks) automatically closed on stream end
• Observable pattern - RxJS Observable for event streaming
• Custom tools via MCP - Define custom tools using Claude SDK's tool() function
• Forwarded props - Per-run option overrides with security whitelist

Examples

The integration includes 5 example agents:

| Route | Description | Features | |-------|-------------|----------| | /agentic_chat | Basic conversational assistant | Simple chat | | /backend_tool_rendering | Weather tool (backend MCP) | Backend tool execution, tool rendering | | /shared_state | Recipe collaboration | Bidirectional state sync, ag_ui_update_state | | /human_in_the_loop | Task planning with approval | Frontend tools, step tracking, approval workflow | | /tool_based_generative_ui | Frontend tool rendering | Dynamic frontend tools, generative UI |

Running the Examples

# Install dependencies
cd integrations/claude-agent-sdk/typescript
pnpm install

# Start server (port 8889)
ANTHROPIC_API_KEY=sk-ant-xxx npx tsx examples/server.ts

# Start Dojo (in another terminal)
cd apps/dojo
pnpm dev

Visit http://localhost:3000 and select "Claude Agent SDK (Typescript)"

Links

• Claude Agent SDK
• AG-UI Documentation
• AG-UI State Management