A guide for creating Cursor hooks: scripts or checks that run before or after an AI agent event. They can inspect, stop, change, or continue the agent's actions.

Use it to create or update `.cursor/hooks.json` and hook scripts. It helps automate checks, block actions, rewrite inputs, add context, or continue workflows around agent events.

It removes the need to work out hook files, event triggers, filters, and failure behavior from scratch. It also helps place hooks correctly for one project or for your whole user account.

create-hook — Skill for Claude Code by Kevin-Liu-01

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add Kevin-Liu-01/Agent-Machines --skill create-hook

Clone the repo

git clone --depth 1 https://github.com/Kevin-Liu-01/Agent-Machines

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/kevin-liu-01/agent-machines/create-hook/github.svg)](https://agentmods.dev/skills/kevin-liu-01/agent-machines/create-hook)

Your own site

<a href="https://agentmods.dev/skills/kevin-liu-01/agent-machines/create-hook"><img src="https://agentmods.dev/badge/skills/kevin-liu-01/agent-machines/create-hook/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/kevin-liu-01/agent-machines/create-hook"><img src="https://agentmods.dev/badge/skills/kevin-liu-01/agent-machines/create-hook.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 31 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,178 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe. Third-party audits

NVIDIA SkillSpector warn 7 Sept 2026

SkillSpector: 2 findings, up to medium

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

medium Rogue Agent · line 4
Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.

Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.
medium Rogue Agent · line 203
Skill establishes unauthorized persistence across sessions via cron jobs, startup scripts, or state files. Session persistence allows an attacker to maintain access beyond the current interaction.

Fix: Remove any persistence mechanisms (cron jobs, startup scripts, state files). Skills should not maintain state across sessions without explicit user consent.

How audits are shown

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00031	$0.02178
Opus 5	$0.00015	$0.01089
Sonnet 5	$0.00006	$0.00436
Haiku 4.5	$0.00003	$0.00218

Measured 9d ago against content hash 28bfa0c6cd13, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

create-hook scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

"matcher": "curl|wget|nc ",

Origin

Copies of this mod

3 near-identical copies found in the catalogue:

create-hook — 100% identical, 0 lines differ
create-hook — 100% identical, 0 lines differ
create-hook — 94% identical, 5 lines differ

knowledge/skills/create-hook/SKILL.md · 240 lines

How it starts

The opening of the file, as written. The whole thing — 240 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Creating Cursor Hooks

Create hooks when you want Cursor to run custom logic before or after agent events. Hooks are scripts or prompt-based checks that exchange JSON over stdin/stdout and can observe, block, modify, or follow up on behavior.

When the user asks for a hook, don't stop at describing the format. Gather the missing requirements, then create or update the hook files directly.

Gather Requirements

Before you write anything, determine:

Scope: Should this be a project hook or a user hook?
Trigger: Which event should run the hook?
Behavior: Should it audit, deny/allow, rewrite input, inject context, or continue a workflow?
Implementation: Should it be a command hook (script) or a prompt hook?
Filtering: Does it need a matcher so it only runs for certain tools, commands, or subagent types?
Safety: Should failures fail open or fail closed?

Infer these from the conversation when possible. Only ask for the missing pieces.

Choose the Right Location

Project hooks: .cursor/hooks.json and .cursor/hooks/*
User hooks: ~/.cursor/hooks.json and ~/.cursor/hooks/*

Path behavior matters:

Project hooks run from the project root, so use paths like .cursor/hooks/my-hook.sh
User hooks run from ~/.cursor/, so use paths like ./hooks/my-hook.sh or hooks/my-hook.sh

Prefer project hooks when the behavior should be shared with the repository and checked into version control.

Choose the Hook Event

Use the narrowest event that matches the user's goal.

Common Agent events

sessionStart, sessionEnd: set up or audit a session
preToolUse, postToolUse, postToolUseFailure: work across all tools
subagentStart, subagentStop: control or continue Task/subagent workflows
beforeShellExecution, afterShellExecution: gate or audit terminal commands
beforeMCPExecution, afterMCPExecution: gate or audit MCP tool calls
beforeReadFile, afterFileEdit: control file reads or post-process edits
beforeSubmitPrompt: validate prompts before they are sent
preCompact: observe context compaction
stop: handle agent completion
afterAgentResponse, afterAgentThought: track agent output or reasoning

Read the full file on GitHub · 240 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

9d ago First seen · 240 lines · 31 tokens per session scan A 28bfa0c6cd13

Subscribe to this mod's changes

create-hook is a skill published in the GitHub repository Kevin-Liu-01/Agent-Machines (26 stars, last pushed 8d ago), licensed MIT. It adds 31 tokens to every session and 2,178 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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create-hook