Documentation

2026-05-25

SDKCLIPlatform

Week of May 18 – 25

New features

Opt out of HTTP/2 in the Python SDK. You can now disable HTTP/2 when constructing the SDK’s HTTP transport, which is useful for environments where HTTP/2 causes connection issues with proxies or load balancers. HTTP/2 remains the default. See the SDK reference for transport configuration.

Clearer lifecycle precedence in the SDKs. When creating a sandbox, lifecycle.onTimeout / lifecycle.on_timeout now consistently takes precedence over the older autoPause / auto_pause argument across both JS and Python SDKs. Passing a partial lifecycle object no longer throws or silently misbehaves. See Sandbox lifecycle.
autoPause / auto_pause is deprecated. Use lifecycle.onTimeout: "pause" instead. Calls that pass autoPause will continue to work but emit a deprecation warning.
Stricter validation for autoResume. Setting autoResume: true together with an effective timeout action of kill now raises InvalidArgumentError (JS) / InvalidArgumentException (Python) at sandbox creation time, surfacing a misconfiguration that previously failed silently.
Faster sandbox creation under load. Reservation waiting on the API now wakes via pub/sub instead of polling, reducing latency when many sandboxes are created at once.
Better error responses for invalid template tags. The API now returns 400 Bad Request (instead of a generic server error) when a template tag is invalid. See Template tags & versioning.
Removed experimental Sandbox.betaCreate / Sandbox.beta_create. The beta surface has been removed now that its options are available on the stable Sandbox.create API. Migrate any remaining usage to Sandbox.create with the equivalent lifecycle options.

JS SDK: Improved HTTP/2 dispatcher behavior for envd RPC and API traffic, reducing connection-reuse issues under concurrency.
Python SDK: gRPC streams used by file watchers and command execution are now properly closed on teardown, preventing leaked connections and goroutines.
CLI: e2b auth login no longer fails on headless machines that don’t have xdg-open. The CLI now falls back to printing the login URL for you to open manually. See CLI authentication.