[BUG] Glob tool silently fails with absolute paths (macOS - cross-platform issue)

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?

Glob fails silently when using absolute paths with wildcards in the pattern
parameter on macOS. This is the same issue as #10337 (Windows), proving it's not a
Windows-specific backslash escaping problem - it's a cross-platform bug in how Glob
handles absolute paths.

Working directory: /Users/alex/src/afk
File exists: /Users/alex/src/afk/docs/analysis/product-brief-afk-2025-12-09.md

Glob("/Users/alex/src/afk/docs/analysis/brief.md") → "No files found"
Glob("docs/analysis/brief.md") → finds the file

What Should Happen?

Either:

1. Absolute paths should work in the pattern parameter, OR
2. The tool should return an error/warning explaining that only relative paths are

supported

Silent failure is the worst outcome - agents make incorrect decisions based on
incomplete information.

Error Messages/Logs

No files found

  No error, no warning. Just empty results.

Steps to Reproduce

1. Have a file at an absolute path, e.g. /Users/alex/src/project/docs/file.md
2. Working directory is /Users/alex/src/project
3. Run: Glob("/Users/alex/src/project/docs/*.md") → Returns "No files found"
4. Run: Glob("docs/*.md") → Successfully finds the file

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.0.62 (Claude Code)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

Impact

In my case, a workflow missed an existing product brief document and incorrectly
reported a "greenfield project" with zero input documents. The agent proceeded with
wrong assumptions because Glob silently returned empty results.

Related Issues

• #10337 - Same bug on Windows. That issue assumes backslash escaping is the cause,

but this macOS reproduction proves it's a fundamental issue with absolute paths, not
Windows-specific escaping.