Write and Edit tools fail with EEXIST error on Windows/NTFS

Starting with Claude Code 2.1.69, the Write and Edit tools intermittently fail with:

EEXIST: file already exists, mkdir 'C:\Users\<user>\.claude\projects\<project>\memory'

The directory already exists and is a regular directory (not a symlink/junction). The error occurs during the internal mkdir call that precedes the actual file write.

Environment

• Claude Code: 2.1.63
• Node.js: v22.17.0
• OS: Windows 11 Home 10.0.26200
• Shell: Git Bash
• Filesystem: NTFS

Steps to reproduce

1. Have a project with .claude/ directory containing symlinks (e.g., skills/shared -> d:\other-repo\.claude\skills)
2. Try to Write or Edit any file in an existing subdirectory
3. Tool fails with EEXIST on mkdir for the parent directory

Observed behavior

• Write creates a 0-byte file, then subsequent attempts fail with EEXIST
• Edit fails immediately with EEXIST even though both the directory and file exist
• The error is on mkdir, not on the file write itself — fs.mkdir(recursive: true) appears to choke on already-existing directories

Expected behavior

mkdir with recursive: true should silently succeed if the directory already exists (per Node.js docs).

Workaround

Use Bash tool with cat > file or a Python script to write files instead of Write/Edit tools.

Notes

• Worked fine for ~2 months prior, started after a recent update (likely Claude Code or Node.js upgrade)
• The project has symlinks in .claude/skills/shared — this may be a contributing factor but the error also reproduces on plain directories without symlinks