What you’ll make possible
Produce a four-line explanation of an existing hook without changing or running it.
A Codex hook connects a lifecycle event to an action. A SessionStart hook reacts to a session starting; PostToolUse reacts after a tool is used. React’s useState Hook is a different concept.
The useful question is concrete: what happens, when, to which data, and where does that data go? This exercise inspects a definition. It does not enable it.
// Your turn
Try this.
Open /hooks in Codex CLI and select an existing hook for inspection. Do not trust, enable or edit it as part of this exercise.
Write down the event, any matcher and the command or MCP handler. Follow the referenced script or tool documentation before describing its effect.
Write four lines: Trigger; Action; Data read or written; Destination. Mark anything you cannot establish as unknown.
Check whether the handler can send information, modify files or invoke a paid service. Seek the appropriate review before any future activation. The presence of a definition is not evidence that it has run successfully.
References & credits2 sources +
Sources checked . Features and terms can change.