Codex CLI now supports 5 hooks after v0.117.0 — PreToolUse and PostToolUse just dropped

Enhanced Hook Support in Codex CLI v0.117.0: Introducing PreToolUse and PostToolUse

The latest release of Codex CLI, version 0.117.0, marks a significant step forward in its extensibility and user interaction capabilities. This update introduces two new hooks—PreToolUse and PostToolUse—currently in beta, complementing the existing session and user prompt hooks to provide a more comprehensive event system for developers and users alike.

Overview of the Updated Hooks

With the v0.117.0 update, Codex CLI now supports a total of five hooks:

• SessionStart: Triggered at the beginning of a session.
• SessionStop: Triggered when a session ends.
• UserPromptSubmit: Fired when a user submits a prompt.
• PreToolUse (New): Executed immediately before a tool is invoked.
• PostToolUse (New): Executed immediately after a tool has been used.

The addition of PreToolUse and PostToolUse hooks provides developers with finer control over the tool invocation process, enabling more sophisticated automation, logging, or custom workflows around tool usage.

Practical Applications and Enhancements

To demonstrate the potential of this new hook system, a developer has created a wrapper that generates auditory feedback by playing pre-recorded human sounds aligned with each hook event. This setup offers users intuitive audio cues during their interaction sessions, such as hearing a sound when a session starts or stops, or when a prompt is submitted. A video demonstration illustrates this feature in action, showcasing how integrated audio responses can enhance user engagement and accessibility.

Get Involved and Explore the Code

Developers interested in leveraging these hooks or building custom integrations can access the complete implementation on GitHub:

https://github.com/shanraisshan/codex-cli-hooks

This repository provides the source code and guidance to implement and extend the hook system within your own workflows.

Conclusion

The addition of PreToolUse and PostToolUse in Codex CLI v0.117.0 underscores a commitment to flexible, event-driven automation. Whether for enhancing user experience with auditory feedback or enabling complex automation pipelines, these new hooks open up a range of possibilities for developers working with Codex CLI. As the community explores and builds upon these features, we can anticipate more innovative use cases emerging in the near future.