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HomeDocsClaude Code CLI 9 Oct 2026
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Agent SDK reference - Python changedagent-sdk/python

Nearest release: v2.1.296, published 2 hours after 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 9 Oct 2026 14:19 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 9 Oct 2026 14:37 UTC.

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891891* `API_TIMEOUT_MS`: per-request timeout on the Anthropic client, in milliseconds. Default `600000`. Applies to the main loop and all subagents.
892* `CLAUDE_CODE_MAX_RETRIES`: maximum API retries. Default `10`, capped at `15`. Each retry gets its own `API_TIMEOUT_MS` window, so worst-case wall time is roughly `API_TIMEOUT_MS × (CLAUDE_CODE_MAX_RETRIES + 1)` plus backoff. 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.
892* `CLAUDE_CODE_MAX_RETRIES`: maximum API retries. Default `10`, capped at `15`. Each retry gets its own `API_TIMEOUT_MS` window.
893 
894 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.
893895* `CLAUDE_ASYNC_AGENT_STALL_TIMEOUT_MS`: stall watchdog for subagents. While the stream watchdog is on, the default is `CLAUDE_STREAM_IDLE_TIMEOUT_MS` plus 5 minutes, which comes to `600000` unless you raise that variable. With the stream watchdog off, the default is `600000`. Before v2.1.257, the default was always `600000`.
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895897 The timer resets on each stream event. On a stall, Claude Code aborts the subagent and reports the stall to the parent. For a background subagent, it also marks the task failed and attaches any partial result.
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