[BUG] Bash tool stdout disappears

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?

For the bug report, the key details would be: - Issue: Bash tool returns no output when commands produce stdout

• Expected: Should see pnpm headers and biome output (errors/warnings)
• Actual: Exit code 0 returned, but all stdout swallowed
• Environment: Windows/MINGW64 (GitBash)
• Reproduction: Run pnpm lint in a project with biome errors - tool shows nothing, manual bash shows full output

This seems like a stdout capture bug specific to certain environments or output lengths.

What Should Happen?

Should see pnpm headers and biome output (errors/warnings)

Error Messages/Logs

Exit code 0 returned, but all stdout swallowed

Steps to Reproduce

Run pnpm lint in a project with biome errors - tool shows nothing, manual bash shows full output

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

$ claude --version 2.1.17 (Claude Code)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

VS Code integrated terminal

Additional Information

_No response_