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Claude Agent SDK (TypeScript) v0.3.319

Author
Anthropic
Published
6 November 2026
Added
9 November 2026
Original
https://github.com/anthropics/claude-agent-sdk-typescript/releases/tag/v0.3.319

Summary

Version 0.3.319 of the TypeScript Claude Agent SDK, released on 2026-11-06, matches Claude Code 2.1.319. Its one new feature is MCP task support in SDK sessions. The rest are fixes to session metrics and session deletion.

Key points

  • MCP tasks: with CLAUDE_AUTO_BACKGROUND_TASKS=1 and streaming input, an MCP tool call that the server runs as a task goes to the background, with task_type set to "mcp_task". Not available on Bedrock, Vertex, or Foundry.
  • deleteSession() now rejects with ENOTEMPTY if the session folder could not be fully deleted.
  • session_writes_lost is sent only when the CLI exits 0, and now names the right session after /clear in a resumed session.
  • The OpenTelemetry claude_code.session.count metric no longer counts prewarm() processes that were never claimed.
  • Install: npm install @anthropic-ai/claude-agent-sdk@0.3.319.

Why it matters

SDK agents can start long MCP jobs and keep working while they run, the same as Claude Code in the terminal (see Claude Code 2.1.319).