# TypeScript SDK V2 interface (preview)

Preview of the simplified V2 TypeScript Agent SDK, with session-based send/stream patterns for multi-turn conversations.

---

<Warning>
The V2 interface is an **unstable preview**. APIs may change based on feedback before becoming stable. Some features like session forking are only available in the [V1 SDK](/docs/en/agent-sdk/typescript).
</Warning>

The V2 Claude Agent TypeScript SDK removes the need for async generators and yield coordination. This makes multi-turn conversations simpler, instead of managing generator state across turns, each turn is a separate `send()`/`stream()` cycle. The API surface reduces to three concepts:

- `createSession()` / `resumeSession()`: Start or continue a conversation
- `session.send()`: Send a message
- `session.stream()`: Get the response

## Installation

The V2 interface is included in the existing SDK package:

```bash
npm install @anthropic-ai/claude-agent-sdk
```

## Quick start

### One-shot prompt

For simple single-turn queries where you don't need to maintain a session, use `unstable_v2_prompt()`. This example sends a math question and logs the answer:

```typescript
import { unstable_v2_prompt } from "@anthropic-ai/claude-agent-sdk";

const result = await unstable_v2_prompt("What is 2 + 2?", {
  model: "claude-opus-4-6"
});
if (result.subtype === "success") {
  console.log(result.result);
}
```

<details>
<summary>See the same operation in V1</summary>

```typescript
import { query } from "@anthropic-ai/claude-agent-sdk";

const q = query({
  prompt: "What is 2 + 2?",
  options: { model: "claude-opus-4-6" }
});

for await (const msg of q) {
  if (msg.type === "result" && msg.subtype === "success") {
    console.log(msg.result);
  }
}
```

</details>

### Basic session

For interactions beyond a single prompt, create a session. V2 separates sending and streaming into distinct steps:
- `send()` dispatches your message
- `stream()` streams back the response

This explicit separation makes it easier to add logic between turns (like processing responses before sending follow-ups).

The example below creates a session, sends "Hello!" to Claude, and prints the text response. It uses [`await using`](https://www.typescriptlang.org/docs/handbook/release-notes/typescript-5-2.html#using-declarations-and-explicit-resource-management) (TypeScript 5.2+) to automatically close the session when the block exits. You can also call `session.close()` manually.

```typescript
import { unstable_v2_createSession } from "@anthropic-ai/claude-agent-sdk";

await using session = unstable_v2_createSession({
  model: "claude-opus-4-6"
});

await session.send("Hello!");
for await (const msg of session.stream()) {
  // Filter for assistant messages to get human-readable output
  if (msg.type === "assistant") {
    const text = msg.message.content
      .filter((block) => block.type === "text")
      .map((block) => block.text)
      .join("");
    console.log(text);
  }
}
```

<details>
<summary>See the same operation in V1</summary>

In V1, both input and output flow through a single async generator. For a basic prompt this looks similar, but adding multi-turn logic requires restructuring to use an input generator.

```typescript
import { query } from "@anthropic-ai/claude-agent-sdk";

const q = query({
  prompt: "Hello!",
  options: { model: "claude-opus-4-6" }
});

for await (const msg of q) {
  if (msg.type === "assistant") {
    const text = msg.message.content
      .filter((block) => block.type === "text")
      .map((block) => block.text)
      .join("");
    console.log(text);
  }
}
```

</details>

### Multi-turn conversation

Sessions persist context across multiple exchanges. To continue a conversation, call `send()` again on the same session. Claude remembers the previous turns.

This example asks a math question, then asks a follow-up that references the previous answer:

```typescript
import { unstable_v2_createSession } from "@anthropic-ai/claude-agent-sdk";

await using session = unstable_v2_createSession({
  model: "claude-opus-4-6"
});

// Turn 1
await session.send("What is 5 + 3?");
for await (const msg of session.stream()) {
  // Filter for assistant messages to get human-readable output
  if (msg.type === "assistant") {
    const text = msg.message.content
      .filter((block) => block.type === "text")
      .map((block) => block.text)
      .join("");
    console.log(text);
  }
}

// Turn 2
await session.send("Multiply that by 2");
for await (const msg of session.stream()) {
  if (msg.type === "assistant") {
    const text = msg.message.content
      .filter((block) => block.type === "text")
      .map((block) => block.text)
      .join("");
    console.log(text);
  }
}
```

<details>
<summary>See the same operation in V1</summary>

```typescript
import { query } from "@anthropic-ai/claude-agent-sdk";

// Must create an async iterable to feed messages
async function* createInputStream() {
  yield {
    type: "user",
    session_id: "",
    message: { role: "user", content: [{ type: "text", text: "What is 5 + 3?" }] },
    parent_tool_use_id: null
  };
  // Must coordinate when to yield next message
  yield {
    type: "user",
    session_id: "",
    message: { role: "user", content: [{ type: "text", text: "Multiply by 2" }] },
    parent_tool_use_id: null
  };
}

const q = query({
  prompt: createInputStream(),
  options: { model: "claude-opus-4-6" }
});

for await (const msg of q) {
  if (msg.type === "assistant") {
    const text = msg.message.content
      .filter((block) => block.type === "text")
      .map((block) => block.text)
      .join("");
    console.log(text);
  }
}
```

</details>

### Session resume

If you have a session ID from a previous interaction, you can resume it later. This is useful for long-running workflows or when you need to persist conversations across application restarts.

This example creates a session, stores its ID, closes it, then resumes the conversation:

```typescript
import {
  unstable_v2_createSession,
  unstable_v2_resumeSession,
  type SDKMessage
} from "@anthropic-ai/claude-agent-sdk";

// Helper to extract text from assistant messages
function getAssistantText(msg: SDKMessage): string | null {
  if (msg.type !== "assistant") return null;
  return msg.message.content
    .filter((block) => block.type === "text")
    .map((block) => block.text)
    .join("");
}

// Create initial session and have a conversation
const session = unstable_v2_createSession({
  model: "claude-opus-4-6"
});

await session.send("Remember this number: 42");

// Get the session ID from any received message
let sessionId: string | undefined;
for await (const msg of session.stream()) {
  sessionId = msg.session_id;
  const text = getAssistantText(msg);
  if (text) console.log("Initial response:", text);
}

console.log("Session ID:", sessionId);
session.close();

// Later: resume the session using the stored ID
await using resumedSession = unstable_v2_resumeSession(sessionId!, {
  model: "claude-opus-4-6"
});

await resumedSession.send("What number did I ask you to remember?");
for await (const msg of resumedSession.stream()) {
  const text = getAssistantText(msg);
  if (text) console.log("Resumed response:", text);
}
```

<details>
<summary>See the same operation in V1</summary>

```typescript
import { query } from "@anthropic-ai/claude-agent-sdk";

// Create initial session
const initialQuery = query({
  prompt: "Remember this number: 42",
  options: { model: "claude-opus-4-6" }
});

// Get session ID from any message
let sessionId: string | undefined;
for await (const msg of initialQuery) {
  sessionId = msg.session_id;
  if (msg.type === "assistant") {
    const text = msg.message.content
      .filter((block) => block.type === "text")
      .map((block) => block.text)
      .join("");
    console.log("Initial response:", text);
  }
}

console.log("Session ID:", sessionId);

// Later: resume the session
const resumedQuery = query({
  prompt: "What number did I ask you to remember?",
  options: {
    model: "claude-opus-4-6",
    resume: sessionId
  }
});

for await (const msg of resumedQuery) {
  if (msg.type === "assistant") {
    const text = msg.message.content
      .filter((block) => block.type === "text")
      .map((block) => block.text)
      .join("");
    console.log("Resumed response:", text);
  }
}
```

</details>

### Cleanup

Sessions can be closed manually or automatically using [`await using`](https://www.typescriptlang.org/docs/handbook/release-notes/typescript-5-2.html#using-declarations-and-explicit-resource-management), a TypeScript 5.2+ feature for automatic resource cleanup. If you're using an older TypeScript version or encounter compatibility issues, use manual cleanup instead.

**Automatic cleanup (TypeScript 5.2+):**

```typescript
import { unstable_v2_createSession } from "@anthropic-ai/claude-agent-sdk";

await using session = unstable_v2_createSession({
  model: "claude-opus-4-6"
});
// Session closes automatically when the block exits
```

**Manual cleanup:**

```typescript
import { unstable_v2_createSession } from "@anthropic-ai/claude-agent-sdk";

const session = unstable_v2_createSession({
  model: "claude-opus-4-6"
});
// ... use the session ...
session.close();
```

## API reference

### `unstable_v2_createSession()`

Creates a new session for multi-turn conversations.

```typescript
function unstable_v2_createSession(options: {
  model: string;
  // Additional options supported
}): SDKSession;
```

### `unstable_v2_resumeSession()`

Resumes an existing session by ID.

```typescript
function unstable_v2_resumeSession(
  sessionId: string,
  options: {
    model: string;
    // Additional options supported
  }
): SDKSession;
```

### `unstable_v2_prompt()`

One-shot convenience function for single-turn queries.

```typescript
function unstable_v2_prompt(
  prompt: string,
  options: {
    model: string;
    // Additional options supported
  }
): Promise<SDKResultMessage>;
```

### SDKSession interface

```typescript
interface SDKSession {
  readonly sessionId: string;
  send(message: string | SDKUserMessage): Promise<void>;
  stream(): AsyncGenerator<SDKMessage, void>;
  close(): void;
}
```

## Feature availability

Not all V1 features are available in V2 yet. The following require using the [V1 SDK](/docs/en/agent-sdk/typescript):

- Session forking (`forkSession` option)
- Some advanced streaming input patterns

## Feedback

Share your feedback on the V2 interface before it becomes stable. Report issues and suggestions through [GitHub Issues](https://github.com/anthropics/claude-code/issues).

## See also

- [TypeScript SDK reference (V1)](/docs/en/agent-sdk/typescript) - Full V1 SDK documentation
- [SDK overview](/docs/en/agent-sdk/overview) - General SDK concepts
- [V2 examples on GitHub](https://github.com/anthropics/claude-agent-sdk-demos/tree/main/hello-world-v2) - Working code examples