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HomeDocsClaude Code CLI 19 Oct 2026
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Agent SDK reference - TypeScript changedagent-sdk/typescript

Nearest release: v2.1.304, published 2 hours before upstream edited the page. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.

Upstream edited this page at 19 Oct 2026 22:14 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 19 Oct 2026 22:37 UTC.

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579* `API_TIMEOUT_MS`: per-request timeout on the Anthropic client, in milliseconds. Default `600000`. Applies to the main loop and all subagents.
579* [`API_TIMEOUT_MS`](/docs/en/env-vars): how long each request attempt can wait for response headers, in milliseconds. It doesn't limit how long a streaming response runs after the headers arrive. Default `600000`. Applies to the main loop and all subagents.
580580* `CLAUDE_CODE_MAX_RETRIES`: maximum API retries. Default `10`, capped at `15`. Each retry gets its own `API_TIMEOUT_MS` window.
581581 
582582 For unattended runs that need to wait through longer outages, set [`CLAUDE_CODE_RETRY_WATCHDOG=1`](/docs/en/errors#tune-retry-behavior): it retries transient capacity errors indefinitely and, on Claude Code v2.1.199 or later, raises the default for other transient errors to `300` and removes the cap on this variable.
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52675267When Claude Code [moves a long MCP tool call to the background](/docs/en/mcp#automatic-backgrounding-of-long-tool-calls), the `tool_result` block for that call holds only a placeholder and the call's real result arrives in this notification. Match the notification to the call with `tool_use_id`. On a `completed` notification, `resource_links` lists the files the tool returned by reference as [`SDKMcpResourceLink`](#sdkmcpresourcelink) entries, with the same 50-link and 64 KiB limits as [`tool_use_result.resourceLinks`](#sdkusermessage). Claude Code omits `resource_links` when the result had no links and on notifications for tasks that aren't MCP tool calls. `resource_links` requires Agent SDK v0.3.257 or later.
52685268 
5269Claude Code prepends a notice to every task notification it sends to the model, except deliveries stamped with the [`scheduled-trigger` subkind](#task-notification-subkinds), which carry an assigned-task framing instead. The notice states that no human input has occurred, so the model doesn't treat the notification as a user instruction or ap
5269Claude Code prepends a notice to every task notification it sends to the model, except deliveries stamped with the [`scheduled-trigger` subkind](#task-notification-subkinds), which carry an assigned-task framing instead. The noti
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