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AgentCore Runtime Adds Bring-Your-Own File System with S3 and EFS for Multi-Agent Collaboration
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AWS just made multi-agent file sharing a non-issue. AgentCore Runtime now lets you mount S3 or EFS directly into agent sessions at paths you define — no custom mount code, no re-downloading shared assets on every run. S3 handles sync automatically; EFS gives you sub-millisecond NFS latency when agents need to read and write the same data simultaneously. The boring plumbing is done; the question now is whether developers actually build the coordination logic on top of it.
Full analysis
AWS AgentCore Runtime now supports attaching Amazon S3 Files and Amazon EFS (Elastic File System) access points directly to agent sessions, mounted at developer-specified paths using standard file operations with no custom mount code required. This enables agents to load shared prompt templates, skills, or datasets at session start without re-downloading, persist intermediate results across sessions, and collaborate on shared data across multiple agents simultaneously. S3 Files offers automatic synchronization; EFS provides sub-millisecond latency shared NFS storage. The feature is available across all 15 AWS Regions where AgentCore Runtime is supported.
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