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Frequently asked questions

What is an agentic hook?

An agentic hook is a Node.js script triggered by Claude Code lifecycle events — PreToolUse, PostToolUse, SessionStart, Stop. Hooks enforce deterministic behavior in agentic workflows: block dangerous commands, run tests automatically, inject context, and notify your team — without relying on the LLM to remember.

How do agentic hooks improve vibe coding?

Vibe coding lets an AI agent like Claude Code drive most of your implementation while you set direction. Hooks add CI-like guardrails that fire on every agent action — making your agentic workflow production-safe, auditable, and repeatable regardless of what the model decides to do.

Does HookStack work with GitHub Copilot?

HookStack is built around Claude Code hooks today. The agentic hook patterns are portable: any AI coding agent that exposes lifecycle events can adopt the same deterministic-behavior approach. GitHub Copilot Workspace and similar tools are natural targets as they mature.

Why are Claude Code hooks better than prompt instructions?

Prompts are probabilistic — the model may or may not follow them. Claude Code hooks are deterministic Node.js scripts that execute unconditionally on matching events. No drift, no hallucination, no forgotten rules. That guarantee is what makes agentic workflows trustworthy in production.

How do I install Claude Code hooks with HookStack?

Browse the catalogue, select the hooks you want, then run the generated npx hookstack-cli@latest install command in your project root. HookStack writes the scripts to .claude/hooks/ and patches your settings.json — nothing else touched.

I already use Claude Code commands like /gen-test-unit or /create-worktree — aren't hooks the same thing?

Commands are interactive: you type them, Claude reads and acts on them inside the conversation. Hooks are the opposite — Node.js scripts that fire unconditionally outside the model, triggered by lifecycle events (PreToolUse, PostToolUse, Stop…). The model never sees them, never decides whether to run them, and can't skip them. Commands steer the AI; hooks constrain it.

Do hooks consume tokens from my context window?

No. Hooks run in a separate process, outside the model entirely. They can inject context back into the session via stdout, but the hook scripts themselves — and whatever they compute — are never sent to the model unless you explicitly return a message. Commands, on the other hand, are part of the conversation and consume context. Hooks are a zero-cost enforcement layer.