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danielshmayai
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hooks

Configure deterministic lifecycle hooks in Claude Code via .claude/settings.json.

Updated Mar 27, 2026
Search Tags:#automation#security#validation#hooks#claude#observability#lifecycle
One-click install
npx skills add https://github.com/danielshmayai/Claude-App-Infrastructure --skill hooks-danielshmayai
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: hooks
Source: https://github.com/danielshmayai/Claude-App-Infrastructure/tree/main/skills/hooks
Command: npx skills add https://github.com/danielshmayai/Claude-App-Infrastructure --skill hooks-danielshmayai

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Hooks provide deterministic hooks that fire at specific points in the Claude lifecycle to ensure essential checks and actions always run, improving reliability, security, and governance.

Core Features & Use Cases

  • Ensure PreToolUse validation to prevent destructive actions or misconfigurations.
  • Automatically PostToolUse formatting, linting, or validation to maintain output quality.
  • Manage SessionStart and InstructionsLoaded events for observability, dependency checks, and context setup.
  • Implement Stop and SubagentStop hooks to aggregate results, verify outputs, and nudge safe continuations.
  • Configure and share reusable hook patterns across Claude Code projects via .claude/settings.json.

Quick Start

Activate a minimal hook that logs session start details and validates tool targets before any tool runs.

Frequently Asked Questions about hooks

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I enforce pre-tool validation in Claude Code projects?▼

Pre-tool validation in Claude Code is enforced by configuring PreToolUse lifecycle hooks in the .claude/settings.json file. This ensures deterministic checks fire before any tool runs, preventing destructive actions or misconfigurations.

What are deterministic lifecycle hooks for Claude apps?▼

Deterministic lifecycle hooks are guaranteed actions that fire at specific points in the Claude lifecycle, such as SessionStart or PostToolUse. They ensure essential security checks, formatting, and observability actions always run reliably.

Can I automatically format code after a tool runs in Claude?▼

Yes, automatic formatting after a tool runs is achieved by applying PostToolUse hooks. Configured via .claude/settings.json, these hooks execute deterministic formatting, linting, and validation to maintain output quality.

Does Claude Code support session lifecycle controls for observability?▼

Claude Code supports session lifecycle controls through SessionStart and InstructionsLoaded hooks. These deterministic hooks enable observability, dependency checks, and context setup when a session initializes.

What is the best way to share reusable hook patterns across Claude Code projects?▼

The best way to share reusable hook patterns is by defining explicit command-based hooks and prompts within the .claude/settings.json file. This allows configurations to be shared and applied consistently across multiple Claude Code projects.

How do Stop and SubagentStop hooks aggregate results in Claude?▼

Stop and SubagentStop hooks aggregate results by firing at the end of Claude lifecycle events. They verify outputs, aggregate session results, and nudge safe continuations to ensure complete and reliable task execution.

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