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Sweep 22 Oct 2026 · 04:32Z Build v2.1.308 527 read Stable v2.1.308 Latest v2.1.308 Next v2.1.308 Feeds RSS JSON llms.txt llms-full.txt Unofficial
HomeDocsClaude Code CLI 5 Oct 2026
One change · claude-code

Hooks reference changedhooks

Nearest release: v2.1.290, published an hour 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 5 Oct 2026 16:21 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 5 Oct 2026 16:37 UTC.

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First seen 14 Aug 2026 this site's first read of the page
Recorded edits112to this page, all time

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743743 
744744There is no `$CLAUDE_MODEL` environment variable. The hook can read `$ANTHROPIC_MODEL` if you set it in your shell, but that value doesn't change when you switch models with `/model` during a session.
745745 
746A hook process inherits the parent environment, apart from the `OTEL_*` exporter variables that Claude Code [removes from every subprocess it spawns](/docs/en/monitoring-usage#administrator-configuration) and, when [`CLAUDE_CODE_SUBPROCESS_ENV_SCRUB`](/docs/en/env-vars#variables) is set to `1`, the variables it strips.
746A hook process inherits the parent environment, apart from the `OTEL_*` exporter variables that Claude Code [removes from every subprocess it spawns](/docs/en/monitoring-usage#administrator-configuration) and, when [`CLAUDE_CODE_SUBPROCESS_ENV_SCRUB`](/docs/en/env-vars#variables) is set to `1`, the variables it strips. In a session that [gets the HIPAA configuration](/docs/en/hipaa-setup#check-how-developers-sign-in-and-connect), Claude Code also [removes Anthropic credentials](/docs/en/hipaa-setup#anthropic-credentials-in-commands-hooks-and-mcp-servers) from the hook's environment.
747747 
748748For example, a `PreToolUse` hook for a Bash command receives this on stdin:
749749 
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