Sandbox SDK Built After Source-Level Study of 16 Competitors' Codebases

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The team behind the createos-sandbox SDK reviewed the source code of 16 competing sandbox and compute SDKs — including E2B, Daytona, Modal, and Cloudflare — before writing a single line of their own. The internal analysis spanned 880 lines and focused on transport-layer design decisions rather than documentation. A key finding was that most SDKs lack proper retry logic, with several shipping no retry layer at all and others using fixed delays without backoff or jitter. The resulting SDK implements method-aware retry policies, distinguishing between idempotent methods like GET and DELETE and non-idempotent ones like POST, which only retry on 429 and 503 status codes. Additional design choices include a single flat API surface with one files namespace, environment-variable configuration, and zero runtime dependencies.

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