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Mastra 1.64.0 adds pre-cloned sandbox templates and a Vitest runner so evals can gate CI
Released 2026-09-04, @mastra/core 1.64.0 brings reusable sandbox template APIs in @mastra/platform-workspace plus E2B repo templates, letting a sandbox boot from a pre-cloned, pre-built repository image with background rebuilds and resource sizing to cut cold start for workspace-backed coding agents. A workingDirectory option in MastraSandboxOptions is now honored by every provider (Docker, E2B, Vercel, Railway), and @mastra/evals/vitest exposes runEvals as Vitest tests with expectEvals/expectEval and a per-test score reporter. Two breaking changes: @mastra/factory's sandbox config becomes a callback and drops the fleet/reattach model, and playground-ui collapses Chip, ChipsGroup and StatusBadge into one Badge.
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