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796ca28f55
_rewrite_unique_bare_filenames handed the correlated /mnt/user-data virtual path to Pattern.subn as a replacement template. That path is built from the file's relative path, and a backslash is an ordinary character in a POSIX filename, so a file written literally as "screenshots\q3.png" -- the shape a model produces by passing a Windows-style path to a stdio server on a POSIX host -- turned \q into an unknown template escape. Pattern.subn compiles the template eagerly, so re.error escaped _convert_call_tool_result and failed the whole tool call even though the server had already written the file, and the agent never saw the path. When the backslash does start a known escape (\r, \t, \b ...), the bare-filename pass substituted that byte into the returned text instead, so "screenshots\raw.png" came back as a path with a raw CR in the middle of it. Insert the correlated path through a callable replacement, matching what _rewrite_local_paths_in_text already does, so it is never parsed as a template.