Agent SDK reference - Python changedagent-sdk/python
Nearest release: v2.1.321, published an hour 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 9 Nov 2026 21:00 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 Nov 2026 21:07 UTC.
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27842784Runs a background source and delivers each event to Claude so it can react without polling: `command` runs a script and emits one event per stdout line, and `ws` opens a WebSocket and emits one event per text frame. Provide exactly one of `command` or `ws`.
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2786When Monitor runs a command, it follows the same permission rules as Bash; a WebSocket watch prompts for approval separately. The `ws` source requires Claude Code v2.1.195 or later. See the [Monitor tool reference](https://code.claude.com/docs/en/tools-reference.md#monitor-tool) for behavior and provider availability.
2786The `ws` source requires Claude Code v2.1.195 or later. When Monitor runs a command, it follows the same permission rules as Bash. See the [Monitor tool reference](https://code.claude.com/docs/en/tools-reference.md#monitor-tool) for WebSocket permissions, behavior, and provider availability.
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27882788**Input:**
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