Hooks do not fire in interactive sessions (v0.125.0)

Summary

Hooks configured in ~/.codex/hooks.json (global) and .codex/hooks.json / .codex/config.toml (project-level) do not fire in interactive sessions on Codex CLI v0.125.0.

Environment

• Codex CLI version: v0.125.0
• OS: macOS Darwin 24.6.0 (Apple Silicon)
• Shell: zsh

Feature flag status

codex_hooks    stable    true

Confirmed via codex features list.

What I tried

1. Project-level hooks.json

my-project/.codex/hooks.json
my-project/.codex/config.toml  (with [features] codex_hooks = true)

Codex shows the warning: loading hooks from both .codex/hooks.json and .codex/config.toml — confirming files are discovered — but no hooks fire.

2. Project-level config.toml (TOML format)

[features]
codex_hooks = true

[[hooks.SessionStart]]

[[hooks.SessionStart.hooks]]
type = "command"
command = "touch /tmp/codex_hook_fired"
timeout = 10

File /tmp/codex_hook_fired is never created.

3. Global ~/.codex/hooks.json

Added hooks to the global ~/.codex/hooks.json. Same result — hooks are loaded (no error) but never execute.

4. Minimal test

Reduced to the absolute minimum:

{
  "hooks": {
    "SessionStart": [
      {
        "hooks": [
          {
            "type": "command",
            "command": "touch /tmp/codex_hook_fired"
          }
        ]
      }
    ]
  }
}

Started codex, exited. /tmp/codex_hook_fired does not exist.

5. CLI flag

codex --enable codex_hooks

Same result.

Expected behavior

SessionStart hook should execute touch /tmp/codex_hook_fired on session startup, creating the file.

Actual behavior

No hooks fire. No errors in output. Hook configuration is silently loaded but never executed.

Context

I'm building a project management harness (PM-Harness) that uses hooks for schema validation (PreToolUse), session context injection (SessionStart), and feedback loops (Stop). It works with Claude Code and I'm adding Codex CLI support. The hook scripts are ready and dual-compatible, but blocked by this issue.

Possibly related to #17532.