[MODEL] "Let me" prefix leaks into non-English conversations as a fixed pattern

Preflight Checklist

• [x] I have searched existing issues for similar behavior reports
• [x] This report does NOT contain sensitive information (API keys, passwords, etc.)

Type of Behavior Issue

Other unexpected behavior

What You Asked Claude to Do

I asked Claude Code to investigate code implementation in Chinese. For example:
"帮我研究一下 compact 相关的代码实现"

What Claude Actually Did

Claude consistently prefixes its responses with the English phrase "Let me" before switching to Chinese, producing mixed-language output such as:
"Let me先研究一下 compact 相关的代码实现"
"Let me看看这个文件的内容"
"Let me检查一下这个函数"

Expected Behavior

When the user communicates in a non-English language, Claude should use that same language for transitional phrases.

Files Affected

Permission Mode

Accept Edits was ON (auto-accepting changes)

Can You Reproduce This?

Yes, every time with the same prompt

Steps to Reproduce

_No response_

Claude Model

Opus

Relevant Conversation

Impact

Low - Minor inconvenience

Claude Code Version

2.1.59

Platform

Anthropic API

Additional Context

_No response_