React to events with a mod changedplugins/mods/events
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Upstream edited this page at 8 Oct 2026 23:03 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 8 Oct 2026 23:07 UTC.
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256256`result.usage` holds the token counts the Claude API reports for a request, plus the `model` that answered: `input_tokens`, `output_tokens`, `cache_read_input_tokens`, and `cache_creation_input_tokens`. The hook runs for subagents' requests too, so check `e.agentId` when you want only the main conversation.
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258To see the tool calls that the API ran itself during the request, such as calls to the [advisor tool](/docs/en/advisor), read `result.serverToolUses`. Claude Code doesn't run these calls, so no `tool.call` or `tool.check` hook fires for them. The field is absent when the response has no such calls, and it requires Claude Code v2.1.290 or later.
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258260<h3 id="hook-the-settings-hook-events">
259261 Handle the settings hook events
260262</h3>
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