← Agent building

Mastra core 1.77.0 logoMastra core 1.77.0

Open-source TypeScript agent framework. This release adds a FactorySandbox contract with Docker, E2B and Mastra Platform sandbox providers, plus pre-built environment templates to cut cold starts.

Mastra core 1.77.0 logoMastra core 1.77.0

Agent building Score: provisional Tested: no Released 14 Oct 2026

Verdict: A strong pick for TypeScript teams that need agents to run code in sandboxes. The new Factory pieces matter most if you run many sandboxed sessions.

Test notes: Not tested: the verdict is based on the linked public release notes only.

Pricing: Open source

Source: github.com · Last checked 15 Oct 2026

We haven't tested this tool yet, so it's listed but not ranked.

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