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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 22 Oct 2026 18:07 UTC.

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77> 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.
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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.
9> To migrate, use the [`query()` API](/docs/en/agent-sdk/typescript) and the [session options](/docs/en/agent-sdk/sessions.md) 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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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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2525> [!NOTE]
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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.
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.md) for the installs that need one.
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2929## Quick start
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381381## Feature availability
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383The V2 session API does not support every V1 feature. The following require the [V1 SDK](/docs/en/agent-sdk/typescript):
383The V2 session API does not support every V1 feature. The following require the [V1 SDK](/docs/en/agent-sdk/typescript.md):
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385385* Session forking (`forkSession` option)
386386* Some advanced streaming input patterns
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387387 
388388## See also
389389 
390* [TypeScript SDK reference (V1)](/docs/en/agent-sdk/typescript) - Full V1 SDK documentation
391* [SDK overview](/docs/en/agent-sdk/overview) - General SDK concepts
390* [TypeScript SDK reference (V1)](/docs/en/agent-sdk/typescript.md) - Full V1 SDK documentation
391* [SDK overview](/docs/en/agent-sdk/overview.md) - General SDK concepts
392392* [V2 examples on GitHub](https://github.com/anthropics/claude-agent-sdk-demos/tree/main/hello-world-v2) - Working code examples
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