Codex CLI

Support: detection and feedback.

Install

Run OpenFiles: Install Agent Hooks… and pick Codex CLI. OpenFiles writes .codex/hooks.json:

{
  "hooks": {
    "PostToolUse": [
      {
        "matcher": "apply_patch|Edit|Write",
        "hooks": [
          {
            "type": "command",
            "command": "node \"/Users/you/.openfiles/hook.js\" --agent codex --tag openfiles-hook",
            "timeout": 15
          }
        ]
      }
    ]
  }
}

Codex edits files through apply_patch. The hook reads the patch in tool_input.command and takes every *** Add File:, *** Update File: and *** Move to: path. Deleted files are skipped.

If the hook doesn’t fire, check that hooks are enabled in your Codex configuration: Codex hooks documentation.

What Codex sees

The problems come back as hookSpecificOutput.additionalContext, which Codex adds as developer context.