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Mastra Made Persistent Filesystems and Sandboxes a Platform Primitive Instead of a BYO Integration
Mastra announced managed sandboxes and filesystems on August 3, provisioned per environment so staging and production each get their own bucket and sandbox. The new @mastra/platform-workspace SDK exposes PlatformFilesystem and PlatformSandbox primitives, credentials are injected at deploy time as environment variables, sandbox base images stay warmed for fast cold starts, and everything colocates with the project's existing service provider. Notably, billing folds into the project's existing CPU time and data egress rather than arriving as a separate infrastructure bill - the pricing choice that distinguishes a platform primitive from a resold third-party sandbox.
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