AgentZip cuts memory use in high-fanout agent sandboxes by up to 8.7x by compressing against the shared template and across sibling sandboxes

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arXiv 2609.11294 targets workloads where one task spawns many concurrent sandboxes cloned from a single template. AgentZip compresses pages relative to the template and across sibling sandboxes, controls overhead with prefetching at restore time, and schedules the expensive compression during LLM wait periods. It reduces sandbox-owned memory up to 8.7x, against 2.1x for standard Linux compression, and cuts the aggressive-compression slowdown from 3.1x to 1.40x. Memory is the constraint to watch as RL rollouts and hosted-sandbox APIs push fanout up.