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TypeScript SDK V2 session API (removed) changedagent-sdk/typescript-v2-preview

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Upstream edited this page at 15 Sep 2026 21:21 UTC, give or take a minute or two: the time comes from Anthropic’s own sitemap rather than from a commit. This site recorded the change at 20 Oct 2026 18:37 UTC.

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33> Reference for the removed V2 TypeScript Agent SDK session API, with session-based send/stream patterns for multi-turn conversations.
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5<Warning>
6 The V2 session API is no longer supported. TypeScript Agent SDK 0.3.142 removes `unstable_v2_createSession`, `unstable_v2_resumeSession`, `unstable_v2_prompt`, and the `SDKSession` and `SDKSessionOptions` types.
5> [!WARNING]
6>
7> The V2 session API is no longer supported. TypeScript Agent SDK 0.3.142 removes `unstable_v2_createSession`, `unstable_v2_resumeSession`, `unstable_v2_prompt`, and the `SDKSession` and `SDKSessionOptions` types.
8>
9> To migrate, use the [`query()` API](/docs/en/agent-sdk/typescript) and the [session options](/docs/en/agent-sdk/sessions) it accepts. Pass an `AsyncIterable<SDKUserMessage>` for multi-turn conversations, or `options.resume` to continue a saved session. This page is kept for reference if you maintain code on Agent SDK 0.2.x or earlier.
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8 To migrate, use the [`query()` API](/docs/en/agent-sdk/typescript) and the [session options](/docs/en/agent-sdk/sessions) it accepts. Pass an `AsyncIterable<SDKUserMessage>` for multi-turn conversations, or `options.resume` to continue a saved session. This page is kept for reference if you maintain code on Agent SDK 0.2.x or earlier.
9</Warning>
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1111V2 was an experimental session API that removed the need for async generators and yield coordination. Instead of managing generator state across turns, each turn was a separate `send()`/`stream()` cycle. The API surface reduced to creating a session, sending a message, and streaming the response:
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1313* `createSession()` / `resumeSession()`: Start or continue a conversation
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2222npm install @anthropic-ai/[email protected]
2323```
2424 
25<Note>
26 The SDK bundles a native Claude Code binary for your platform as an optional dependency, so most installs need no separate Claude Code install. See the [quickstart's install note](/docs/en/agent-sdk/quickstart) for the installs that need one.
27</Note>
25> [!NOTE]
26>
27> The SDK bundles a native Claude Code binary for your platform as an optional dependency, so most installs need no separate Claude Code install. See the [quickstart's install note](/docs/en/agent-sdk/quickstart) for the installs that need one.
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2929## Quick start
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