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Xinmin Zeng
6a4a30fa2b
read_file decodes with UTF-8. Binary uploads (.xlsx, images, ...) raise UnicodeDecodeError in the sandbox layer. UnicodeDecodeError is a ValueError subclass, not an OSError, so it bypassed the typed handlers and fell through to the generic except, surfacing a vague "Unexpected error reading file" message. The model could not tell the file was binary, so it retried read_file instead of switching to bash + pandas/openpyxl, burning LLM round-trips and bloating context with repeated failures. Add a dedicated UnicodeDecodeError handler that tells the model the file is binary and to use bash with a suitable library (or view_image for images).