Hook

You might say

Configure a post-write hook for me. Every time the AI finishes writing a code file, automatically run Prettier to format it.

A lifecycle hook is a preset script or task that runs automatically when a specific event occurs.For example, git can run a check before a commit, and some AI tools expose an after-write trigger. Event names, parameters, and whether failure blocks the next step are product-specific. Check the current tool's documentation first, and keep risky scripts inside the intended permission and file scope.

Lifecycle Hook

How does a Hook run a check after a file write?

Lifecycle event

For example, an action starts or finishes

triggers

Hook

Runs when the configured event occurs

runs action

Command or result

Runs a check, records data, or performs a follow-up

A Hook is an event-triggered action, not a prompt the user must type every time.

What does a Hook do?

Listen for lifecycle events: A Hook can attach to startup, after a file write, or before a command runs.

Run a preset task: When the event occurs, the tool runs the configured formatter, check, or setup script.

A failure can stop the next action: A pre-commit test hook can block a commit on failure, while running heavy tests after every write can slow the workflow.

Quick checkChoose the best answer

Which mechanism fits automatic formatting after the AI writes a file?

Configure a post-write Hook to run the formatter after the file-write eventCreate a Skill and let the agent decide whether to format each timeA Hook will automatically repair business logic bugs in generated code

You can say this to an AI Agent

Configure a post-write formatting hook for .ts and .tsx files. Explain when it runs and what it changes, and make sure it cannot read secrets or touch unrelated directories.

Learn next

1Skill→2Plugin→3Permission Mode→

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