/review command ignores language settings in Japanese environment and AGENTS.md #5113

What version of Codex CLI is running?

codex-cli 0.46.0

Which model were you using?

gpt-5-codex(medium)

What platform is your computer?

macOS 15.6.1

What steps can reproduce the bug?

1. Set system locale to Japanese (ja_JP.UTF-8 or equivalent)
2. Create .codex/AGENTS.md with Japanese language instruction:

   # Instructions for Codex
   
   常に日本語で回答してください。
   (Always respond in Japanese)

3. Run /review command on any file or pull request
4. Observe the response

What is the expected behavior?

The /review command should respect:

• System language settings (Japanese locale)
• Language instructions specified in AGENTS.md
• User's language preference indicated in the environment

Expected: Review output in Japanese

What do you see instead?

The /review command always responds in English, regardless of:

• Japanese system locale
• Japanese language instruction in AGENTS.md
• User's clear preference for Japanese output

Additional information

Impact:

• Affects users in Japanese-speaking environments
• Contradicts the documented behavior of AGENTS.md respecting custom instructions
• Inconsistent with other Codex commands that may respect language settings

Workaround attempts:
None effective. Even explicit Japanese instructions in AGENTS.md are ignored by /review.

Related:

• Other Codex commands (e.g., general queries) may respect AGENTS.md instructions
• Only /review command seems to have this language override issue

Environment details:

• Reproducible across different operating systems
• Occurs with Japanese locale settings
• AGENTS.md instructions work for other commands but not /review