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A worker in my local-model swarm ran pytest against a file that did not exist, twice, and finished the task green. The pipe had eaten the exit code. Measured on bash and zsh, on pytest and cargo — including why turning pipefail on just moves the lie to the other side.
Our swarm workers kept re-reading files they had already read. Context compaction was summarising the tool output that held the file. Pasting the file into the summary does not fix it; returning the last turns verbatim does. Measured three ways on the same 27B.
