Checked fact 124112 Oct 2026Agents and apps

The documentation says hooks run in the application process, not inside the agent's context window, and that a PreToolUse hook that rejects a tool call prevents it from executing.

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The exact words it rests on

Hooks run in your application process, not inside the agent's context window, so they don't consume context. Hooks can also short-circuit the loop: a PreToolUse hook that rejects a tool call prevents it from executing, and Claude receives the rejection message instead.

What the source said when we opened it, on 12 Oct 2026.

The source

How the agent loop works
Claude Code documentation

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Checked

Checked by the notis newsroom on 12 Oct 2026, against the source above.

In the story

How an agent harness runs a model and enforces limits 12 Oct 2026

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“The documentation says hooks run in the application process, not inside the agent's context window, and that a PreToolUse hook that rejects a tool call prevents it from executing.” ai notis, checked 12 Oct 2026. Source: How the agent loop works (Claude Code documentation). https://ainotis.com/c/1241

As a reference (APA style)

ai notis. (2026, October 12). The documentation says hooks run in the application process, not inside the agent's context window, and that a PreToolUse hook that rejects a tool call prevents it from executing [Checked claim 1241]. ai notis. https://ainotis.com/c/1241

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