Bash tool halves backslashes

“On Windows, the Bash tool (Git Bash) halves every run of two or more backslashes in the command before bash sees it — regardless of shell quoting.”

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I hit this bug: rapsheet.dev/sheets/claude-code/issues/432/file
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Fading. 1 report or thumbs-up in the last 7 days and 3 the week before, down from 4 a week at the early-October peak. A workaround is known.

Bash tool halves backslash pairs on Windows, even when quoted. Happens before bash parses the command, so single quotes and quoted heredocs (<<'EOF') do not protect them; PowerShell tool unaffected.

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File my report

Where: Bash tool
Versions: 2.1.281 to 2.1.312
Platforms: Windows
How bad: Breaks a normal workflow.

Not quite your bug?

Bash command truncated at 8186 chars11 people
Bash tool loses PATH3 people

Original reports8, newest first

Oct 28, 2026Windows: Bash tool halves every double backslash in commands (MSYS2 parses the -c argument), breaking heredocs, JSON and paths#105606
Oct 19, 2026Bash tool drops one backslash from every \\ pair before the command reaches the shell#103496
Oct 9, 2026Windows: Bash tool commands are cut at about 8,191 characters, including a per-session environment prefix that grows with every SessionStart; double backslashes are halved before the shell sees the command#100936
Oct 6, 2026Windows: the Bash tool halves every backslash pair in a command before Git Bash parses it (heredocs and single quotes included)#100063
Oct 4, 2026Windows: Bash tool silently truncates commands over ~8K chars (each ' counts ~5) and collapses \\ to \ in quoted heredocs#99410
Oct 1, 2026Bash tool on Windows halves runs of backslashes, even inside single quotes and quoted heredocs#98733
Oct 1, 2026Windows Bash tool halves runs of backslashes even inside single quotes / quoted heredocs#98622
Sep 26, 2026Windows: the Bash tool halves every pair of backslashes before bash reads the command#97409