10 pages for premodelswitch.

Intercept and control agent behavior with hooks Claude Code CLI · in the page agent-sdk/hooks …| | [`PreModelSwitch`](/docs/en/hooks#premodelswitch) | No | Yes | A requested model switch, before it happ… Agent SDK reference - TypeScript Claude Code CLI · in the page agent-sdk/typescript …gentStart" | "SubagentStop" | "PreCompact" | "PostCompact" | "PreModelSwitch" | "PostModelSwitch" | "PermissionRequest" | "PermissionDenied" | "Setup" | "TeammateIdle" | "TaskCreat… Claude Code changelog Claude Code CLI · in the page changelog …e> <Update label="2.1.251" description="August 28, 2026"> * Added `PreModelSwitch` and `PostModelSwitch` hook events (block, confirm, or annotate a model switch); `SessionStart` resume hooks now re… Error reference Claude Code CLI · in the page errors …| | `Model switch ... blocked by a PreModelSwitch hook`… Hooks reference Claude Code CLI · in the page hooks …dChanged, FileChanged, and DirectoryAdded as standalone async events, PreModelSwitch as a standalone sequential event that runs before a requested model switch, PostModelSwitch as a standalone async e… Automate actions with hooks Claude Code CLI · in the page hooks-guide …| | `PreModelSwitch` | Before Claude Code applies a model switch that you or a client requested. Can block the switch… Model configuration Claude Code CLI · in the page model-config …variables the host overrides. If you or your organization configure [PreModelSwitch hooks](/docs/en/hooks#premodelswitch), they run before a requested switch applies and can block it or ask you to co… Plugins reference Claude Code CLI · in the page plugins-reference …| | `PreModelSwitch` | Before Claude Code applies a model switch that you or a client requested. Can block the switch… How Claude Code uses prompt caching Claude Code CLI · in the page prompt-caching …d expired. You can also require this confirmation or skip it with a [PreModelSwitch hook](/docs/en/hooks#premodelswitch-decision-control). The [`opusplan` model setting](/docs/en/model-config#opuspl… Week 36 · August 31 – September 4, 2026 Claude Code CLI · in the page whats-new/2026-w36 …<div className="digest-wins-grid"> <div>A <a href="/docs/en/hooks#premodelswitch"><code>PreModelSwitch</code></a> hook can block a model switch you request, and a <a href="/docs/en/hooks#postmodel…