---
title: "Hooks"
description: "Deterministic TypeScript checks that run around every tool call."
canonical: "https://orchestkit.yonyon.ai/docs/hooks"
---

# Hooks

Deterministic TypeScript checks that run around every tool call.

import { Card, Cards } from 'fumadocs-ui/components/card';

Hooks are the deterministic layer. They fire on lifecycle events rather than being invoked, which makes them the right place for guardrails that must not depend on the model choosing to run them.

<Cards>
  <Card
    title="Overview"
    description="What hooks do and when they fire."
    href="/docs/hooks/overview"
  />
  <Card
    title="Architecture"
    description="The dispatcher, the entries map, and how registration works."
    href="/docs/hooks/architecture"
  />
  <Card
    title="Lifecycle hooks"
    description="Session start, prompt submit, and stop events."
    href="/docs/hooks/lifecycle-hooks"
  />
  <Card
    title="Safety hooks"
    description="Guardrails that block destructive or unsafe tool calls."
    href="/docs/hooks/safety-hooks"
  />
  <Card
    title="Memory hooks"
    description="Capturing and recalling context across sessions."
    href="/docs/hooks/memory-hooks"
  />
  <Card
    title="Writing hooks"
    description="Adding a hook, registering it, and keeping counts in sync."
    href="/docs/hooks/writing-hooks"
  />
</Cards>