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41f8960302
When LLM passes a directory path to astrbot_file_read_tool, the tool previously
returned Error: [Errno 13] Permission denied, misleading the LLM into thinking
it was a permissions issue. The real cause: _probe_local_file() calls open('rb')
on the path, which fails on directories with Errno 13 on Windows. This is caught
by except PermissionError and displayed as-is.
Fix: Add os.path.isdir() check in FileReadTool.call() before any file I/O, at
the earliest safe point after path normalization and permission validation.
Returns a clear message: '<path> is a directory, not a file. Use a file path
instead, or use astrbot_execute_shell to list directory contents.'
Changes:
- astrbot/core/tools/computer_tools/fs.py: add isdir guard
- tests/test_computer_fs_tools.py: add test_file_read_tool_rejects_directory_with_clear_message