GREP_GLOB_DESCRIPTION = "Glob pattern (
NOT regex) limiting which files are searched (e.g. '*.py',
'*.ts'). A pattern without '/' matches the file name at any depth; a pattern containing '/' matches the search-root-relative path (e.g. 'src/**/*.py'). This is an in-tool file filter, not a call to the separate glob tool. Brace expansion (e.g. '*.{ts,tsx}'
) is not supported on all backends; run a separate search per extension for reliable results."