Andrei Eternal 6fef421654 [hooks] userpromptsubmit - hook before user's prompt is executed (#14626)
- this allows blocking the user's prompts from executing, and also
prevents them from entering history
- handles the edge case where you can both prevent the user's prompt AND
add n amount of additionalContexts
- refactors some old code into common.rs where hooks overlap
functionality
- refactors additionalContext being previously added to user messages,
instead we use developer messages for them
- handles queued messages correctly

Sample hook for testing - if you write "[block-user-submit]" this hook
will stop the thread:

example run
```
› sup


• Running UserPromptSubmit hook: reading the observatory notes

UserPromptSubmit hook (completed)
  warning: wizard-tower UserPromptSubmit demo inspected: sup
  hook context: Wizard Tower UserPromptSubmit demo fired. For this reply only, include the exact
phrase 'observatory lanterns lit' exactly once near the end.

• Just riding the cosmic wave and ready to help, my friend. What are we building today? observatory
  lanterns lit


› and [block-user-submit]


• Running UserPromptSubmit hook: reading the observatory notes

UserPromptSubmit hook (stopped)
  warning: wizard-tower UserPromptSubmit demo blocked the prompt on purpose.
  stop: Wizard Tower demo block: remove [block-user-submit] to continue.
```

.codex/config.toml
```
[features]
codex_hooks = true
```

.codex/hooks.json
```
{
  "hooks": {
    "UserPromptSubmit": [
      {
        "hooks": [
          {
            "type": "command",
            "command": "/usr/bin/python3 .codex/hooks/user_prompt_submit_demo.py",
            "timeoutSec": 10,
            "statusMessage": "reading the observatory notes"
          }
        ]
      }
    ]
  }
}
```

.codex/hooks/user_prompt_submit_demo.py
```
#!/usr/bin/env python3

import json
import sys
from pathlib import Path


def prompt_from_payload(payload: dict) -> str:
    prompt = payload.get("prompt")
    if isinstance(prompt, str) and prompt.strip():
        return prompt.strip()

    event = payload.get("event")
    if isinstance(event, dict):
        user_prompt = event.get("user_prompt")
        if isinstance(user_prompt, str):
            return user_prompt.strip()

    return ""


def main() -> int:
    payload = json.load(sys.stdin)
    prompt = prompt_from_payload(payload)
    cwd = Path(payload.get("cwd", ".")).name or "wizard-tower"

    if "[block-user-submit]" in prompt:
        print(
            json.dumps(
                {
                    "systemMessage": (
                        f"{cwd} UserPromptSubmit demo blocked the prompt on purpose."
                    ),
                    "decision": "block",
                    "reason": (
                        "Wizard Tower demo block: remove [block-user-submit] to continue."
                    ),
                }
            )
        )
        return 0

    prompt_preview = prompt or "(empty prompt)"
    if len(prompt_preview) > 80:
        prompt_preview = f"{prompt_preview[:77]}..."

    print(
        json.dumps(
            {
                "systemMessage": (
                    f"{cwd} UserPromptSubmit demo inspected: {prompt_preview}"
                ),
                "hookSpecificOutput": {
                    "hookEventName": "UserPromptSubmit",
                    "additionalContext": (
                        "Wizard Tower UserPromptSubmit demo fired. "
                        "For this reply only, include the exact phrase "
                        "'observatory lanterns lit' exactly once near the end."
                    ),
                },
            }
        )
    )
    return 0


if __name__ == "__main__":
    raise SystemExit(main())
```
6fef421654 · 2026-03-17 22:09:22 -07:00
4,624 Commits
2026-01-08 07:50:58 -08:00
2025-04-16 12:56:08 -04:00
2026-02-06 14:41:53 +01:00
2025-04-16 12:56:08 -04:00
2026-03-10 04:11:31 +00:00

npm i -g @openai/codex
or brew install --cask codex

Codex CLI is a coding agent from OpenAI that runs locally on your computer.

Codex CLI splash


If you want Codex in your code editor (VS Code, Cursor, Windsurf), install in your IDE.
If you want the desktop app experience, run codex app or visit the Codex App page.
If you are looking for the cloud-based agent from OpenAI, Codex Web, go to chatgpt.com/codex.


Quickstart

Installing and running Codex CLI

Install globally with your preferred package manager:

# Install using npm
npm install -g @openai/codex
# Install using Homebrew
brew install --cask codex

Then simply run codex to get started.

You can also go to the latest GitHub Release and download the appropriate binary for your platform.

Each GitHub Release contains many executables, but in practice, you likely want one of these:

  • macOS
    • Apple Silicon/arm64: codex-aarch64-apple-darwin.tar.gz
    • x86_64 (older Mac hardware): codex-x86_64-apple-darwin.tar.gz
  • Linux
    • x86_64: codex-x86_64-unknown-linux-musl.tar.gz
    • arm64: codex-aarch64-unknown-linux-musl.tar.gz

Each archive contains a single entry with the platform baked into the name (e.g., codex-x86_64-unknown-linux-musl), so you likely want to rename it to codex after extracting it.

Using Codex with your ChatGPT plan

Run codex and select Sign in with ChatGPT. We recommend signing into your ChatGPT account to use Codex as part of your Plus, Pro, Team, Edu, or Enterprise plan. Learn more about what's included in your ChatGPT plan.

You can also use Codex with an API key, but this requires additional setup.

Docs

This repository is licensed under the Apache-2.0 License.

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