Emit skill warning only once

What version of Codex CLI is running?

.133

What subscription do you have?

API

Which model were you using?

5.5

What platform is your computer?

Reproducible on mac and linux

What terminal emulator and version are you using (if applicable)?

_No response_

Codex doctor report

What issue are you seeing?

Warning about an invalid skills being repeated continuously, even if it's left without user interaction.

<img width="1086" height="505" alt="Image" src="https://github.com/user-attachments/assets/c5f6a12a-5ac0-4d5f-a3cc-4372ae376877" />

What steps can reproduce the bug?

Use this skill

---
name: acd-cli
description: "This project-local skill is intentionally invalid so Codex can reproduce repeated warnings for a SKILL.md description that exceeds the maximum supported length. The body of this description is deliberately verbose and repetitive. It should not be used as a real skill, it should not be copied into a prod$
---

# ACD CLI Repro Skill

This skill is intentionally invalid. It exists only to reproduce Codex skill-loader
warning behavior when a `SKILL.md` front matter `description` is longer than the
allowed 1024 characters.

What is the expected behavior?

Warning prints one time

Additional information

_No response_