Agent SDK reference - Python changedagent-sdk/python
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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934* `API_TIMEOUT_MS`: per-request timeout on the Anthropic client, in milliseconds. Default `600000`. Applies to the main loop and all subagents.
934* [`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.
935935* `CLAUDE_CODE_MAX_RETRIES`: maximum API retries. Default `10`, capped at `15`. Each retry gets its own `API_TIMEOUT_MS` window.
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937937 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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