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Hook

Claude Code lifecycle interception. Hooks run before or after tool calls, prompts, or session events — useful for guardrails, logging, and policy.

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Stories on this topic · 8

Overview

Hook is a lifecycle interception feature in Claude Code that executes custom scripts, HTTP endpoints, or prompts at specific trigger points. It sits in the AI-engineering stack as an automation layer, allowing developers to inject logic into the agentic loop, session management, or tool execution flow without modifying core code.

Use hooks to enforce guardrails, such as blocking destructive terminal commands, or to integrate custom logging and policy enforcement into your development environment. A common pitfall is over-complicating the matcher logic; keep your hooks performant and targeted because poorly written handlers can introduce latency into the agent's tool-call response time or cause unexpected session errors.

Overview based on established industry knowledge; specific figures are published only after source verification.

FAQ

Can hooks block tool calls?+

Yes, by returning a permissionDecision of deny in a PreToolUse hook, you can stop specific tools from executing.

Where should I define project-specific hooks?+

You should define them in the .claude/settings.json file within your project directory so they can be committed to your repository.

Latest stories

Vibe coding workflowHacker News · Jul 15, 2026 2 min read

Grepathy Auto-Documents Claude Code Architecture Decisions directly in Git

Grepathy parses local Claude Code transcripts via git hooks to extract undocumented agent decisions and saves them as Markdown files. This solves the 30-day retention limit of Claude transcripts, ensuring teammates and future agents understand the architecture.

Why it matters

Grepathy parses local Claude Code transcripts via git hooks to extract undocumented agent decisions and saves them as Markdown files. This solves the 30-day retention limit of Claude transcripts, ensuring teammates and future agents understand the architecture.

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Vibe coding workflowHacker News · Aug 21, 2026 2 min read

Vomit CLI pipes dense Claude 5 output through local LLMs for readable terminal logs

Vomit is an open-source local CLI tool designed to translate dense and verbose token streams from Claude 5 into readable English. By piping Claude's terminal output through a local model like GPT-OSS 20B, it keeps developer sessions uncluttered without external telemetry.

Why it matters

Vomit is an open-source local CLI tool designed to translate dense and verbose token streams from Claude 5 into readable English. By piping Claude's terminal output through a local model like GPT-OSS 20B, it keeps developer sessions uncluttered without external telemetry.

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Tools & releasesHacker News · Aug 30, 2026 2 min read

Claude Code Silently Appends Session URLs to Commit Messages and Pull Requests

Claude Code automatically appends session URLs to git commit messages and pull request descriptions without user prompt or onboarding notice. Developers are finding unexpected links cluttering commit histories, but the behavior can be disabled via a configuration setting.

Why it matters

Claude Code automatically appends session URLs to git commit messages and pull request descriptions without user prompt or onboarding notice. Developers are finding unexpected links cluttering commit histories, but the behavior can be disabled via a configuration setting.

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Agents & MCPHacker News · Jun 2, 2026 2 min read

Anthropic releases structured library of seven hundred fifty-four cybersecurity agent skills

Anthropic has published a structured repository containing 754 cybersecurity skills mapped to five major compliance frameworks. Developers can adapt these definitions as system instructions or tools for custom security agents.

Why it matters

Anthropic has published a structured repository containing 754 cybersecurity skills mapped to five major compliance frameworks. Developers can adapt these definitions as system instructions or tools for custom security agents.

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Vibe coding workflowReddit · Jun 24, 2026 2 min read

Build a physical status light indicator for Claude Code agentic runs

An engineering hack uses a DIY status light to track when Claude Code is executing tasks or waiting for input. This physical feedback loop helps developers monitor long-running background agent loops without constantly watching the terminal.

Why it matters

An engineering hack uses a DIY status light to track when Claude Code is executing tasks or waiting for input. This physical feedback loop helps developers monitor long-running background agent loops without constantly watching the terminal.

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Token & cost optimizationGitHub · Jul 23, 2026 2 min read

Code Review Graph Cuts AI Token Consumption in PR Reviews by 82x

Open-source tool code-review-graph uses Tree-sitter AST parsing to build localized structural code maps for AI coding assistants. By querying only impacted call graphs during code reviews, it achieves a median 82x token reduction across supported platforms.

Why it matters

Open-source tool code-review-graph uses Tree-sitter AST parsing to build localized structural code maps for AI coding assistants. By querying only impacted call graphs during code reviews, it achieves a median 82x token reduction across supported platforms.

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