Windows: Bash tool creates tmpclaude-*-cwd files in working directory

Environment

• OS: Windows
• Claude Code version: Latest

Problem

Each Bash tool invocation creates a file named tmpclaude-xxxx-cwd (e.g., tmpclaude-b685-cwd) in the current working directory.

Expected

Temp files should be created in system temp directory (%TEMP% or /tmp).

Actual

Files are created in the working directory with malformed names - appears tmp/claude-xxxx-cwd is being concatenated as tmpclaude-xxxx-cwd (missing path separator).

Reproduction

1. Run any Bash command on Windows
2. Check working directory - new tmpclaude-*-cwd file appears
3. File content is the current working directory path (e.g., /e/H72Cortex)