# Silent Data Corruption

BioAgent-DF swaps reference and candidate values saved at the same scientific computation site back at their original coordinates, then lets a biomedical agent continue on healthy hardware, to audit whether a numerical fault changed what it reads and cites. Across eight SciFact batches, Qwen3.5-4B shows repeatable citation changes in three capture–claim combinations and Gemma 3 4B IT shows repeatable read and citation changes in four, covering two claims; full restoration recovers the reference evidence sets while verdicts stay unchanged. In hERG cardiac-safety screening, silent numerical faults changed testing decisions while the fixed-budget shortlist kept the same number of compounds labeled as blockers.

BioAgent-DF swaps reference and candidate values saved at the same scientific computation site back at their original coordinates, then lets a biomedical agent continue on healthy hardware, to audit whether a numerical fault changed what it reads and cites. Across eight SciFact batches, Qwen3.5-4B shows repeatable citation changes in three capture–claim combinations and Gemma 3 4B IT shows repeatable read and citation changes in four, covering two claims; full restoration recovers the reference evidence sets while verdicts stay unchanged. In hERG cardiac-safety screening, silent numerical faults changed testing decisions while the fixed-budget shortlist kept the same number of compounds labeled as blockers.