Codex clamps official plugin SessionEnd timeout from 5s to 3s

Summary

When Codex loads the official codex@openai-codex plugin, it clamps the plugin's SessionEnd hook timeout from 5 seconds to Codex's 3-second maximum and prints a warning on every startup.

Environment

• Windows 11
• codex-cli 0.146.0
• codex@openai-codex plugin 1.0.6

Reproduction

1. Install or enable codex@openai-codex in Codex.
2. Start a new Codex session.
3. Observe the startup warning.

clamping SessionEnd hook timeout to 3s in ...\plugins\cache\openai-codex\codex\1.0.6\hooks\hooks.json

The current manifest sets the SessionEnd timeout to 5 seconds:
https://github.com/openai/codex-plugin-cc/blob/main/plugins/codex/hooks/hooks.json

Actual behavior

Codex emits a warning and enforces 3 seconds, so the declared 5-second cleanup budget is not honored.

Expected behavior

The official plugin should load in Codex without a validation warning, while preserving enough time for session cleanup on Claude Code.

Compatibility concern

Simply changing the shared value from 5 to 3 seconds may regress Claude Code. Issue #474 asks for the opposite change because cleanup can already exceed 5 seconds.

A host-specific manifest/override, or moving slow cleanup out of the bounded SessionEnd hook, may avoid the conflict.

Security and privacy

No credentials, tokens, project identifiers, or user data are included in this report.

Start with plugins/codex/hooks/hooks.json and compare the SessionEnd timeout with Codex's 3-second limit and the Claude Code compatibility concern. Determine whether a host-specific override or moving slow cleanup is supported by the repository, then verify that Codex loads without the warning while Claude Code retains sufficient cleanup time.