Release Fri, Sep 4, 2026 1 min read

Claude Agent Sdk Typescript 0.3.261

Original release notes

What's changed

Added pluginDelivery: 'initialize' to send plugins over stdin so the launch command line no longer grows with the plugin count (fixes Windows start failures with many plugins)
Fixed query() throwing "Object not disposable" in runtimes without a native Symbol.dispose, such as Node 22 vm contexts (Jest's node environment, vitest vmThreads/vmForks) and Node <18.18
Updated to parity with Claude Code v2.1.261

Update

npm install @anthropic-ai/claude-agent-sdk@0.3.261
## or
yarn add @anthropic-ai/claude-agent-sdk@0.3.261
## or
pnpm add @anthropic-ai/claude-agent-sdk@0.3.261
## or
bun add @anthropic-ai/claude-agent-sdk@0.3.261