Automate actions with hooks changedhooks-guide
Nearest release: v2.1.304, 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 19 Oct 2026 18:23 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 18:37 UTC.
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845845* `"ok": true`: the action proceeds
846846* `"ok": false`: what happens depends on the event:
847847 * `Stop` and `SubagentStop`: the `reason` is fed back to Claude so it keeps working, unless the response also sets `"impossible": true` to mark the condition as one that can never be satisfied, in which case Claude Code allows the stop and the turn ends
848 * `PreToolUse`: the tool call is denied; by default the turn ends and the deny `reason` appears in the chat as a warning line. Set `continueOnBlock: true` on the hook to instead return the `reason` to Claude as the tool error, so it can adjust and continue. Before v2.1.210, the deny `reason` was returned to Claude as the tool error and the turn continued
848 * `PreToolUse`: the tool call is denied; by default the turn ends and the deny `reason` appears in the chat as a warning line. Set `continueOnBlock: true` on the hook to instead return the `reason` to Claude as the tool error, so it can adjust and continue
849849 * `PostToolUse`: by default the turn ends and the `reason` appears in the chat as a warning line. Set `continueOnBlock: true` to feed the `reason` back to Claude and continue the turn instead
850850 * `PostToolBatch`, `UserPromptSubmit`, and `UserPromptExpansion`: the turn ends and the `reason` appears in the chat as a warning line
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