[BUG] Folder starting with "__" causes weird behaviour

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

I have a folder called __tests, whenever I @ tag it in the prompt Claude Code gets confused and starts reading files from __tests__ which then fail cause that's not the directory's name. It of course figures it out eventually but it's very reproducible.

You're right - the directory is __tests (double underscore only at the start), not __tests__. My mistake with the glob pattern.

What Should Happen?

It should use the folder as specified in the prompt.

Error Messages/Logs

Steps to Reproduce

1. Create a __tests folder with a test file
2. Tell CC to read the file while @ tagging the folder

Claude Model

Opus

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

v2.0.75

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Other

Additional Information

_No response_