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The per-request sandbox resolver and `sandboxCacheKey` together enable Mastra Workspaces to support multi-tenant agent deployments with isolated execution environments and reliable background-process continuity — capabilities the prior static sandbox config did not support.
Developers shipping multi-user agents on LangSmith can now enforce per-user data isolation and role-based permissions with roughly 40 lines of Python, eliminating the need for custom middleware or separate access-control infrastructure.