# e2b@2.51.0

Category: agent-infrastructure
Published: 2026-09-18T12:07:13Z
Source: [E2B releases](https://github.com/e2b-dev/E2B/releases/tag/e2b%402.51.0)
Agent usefulness: 94/100
Confidence: 0.96
Content mode: release-watch
Verified: 2026-10-05T12:18:14.655Z
Tags: sandbox, code-execution, agents

## Human Summary
E2B 2.51.0 shifts default handling to the server by removing SDK-side request defaults, adopts v2 sandbox endpoints, and deprecates the secure option on Sandbox.create .

## Agent Summary
E2B version 2.51.0 removes SDK-side defaults for timeout, fork count, internet access, memory retention on pause, and template build CPU/memory, letting the backend handle defaults. Sandbox create and connect migrate to v2 endpoints ( POST /v2/sandboxes and POST /v2/sandboxes/{id}/connect ), which enforce secured envd access and default timeouts. The secure parameter in Sandbox.create is deprecated and ignored, and…

## Body
E2B release v2.51.0 introduces minor and patch changes focused on delegating default configurations and validation to the API backend. Key updates include: - Removal of client-side request defaults: SDK omissions for create/fork/connect timeout (previously 5m), fork count (previously 1), internet access allowance, memory retention during pause, and template build CPU/memory specs are no longer populated client-side; explicit values continue to be passed unchanged. - Adoption of v2 API endpoints: Sandbox.create and connect now hit POST /v2/sandboxes and POST /v2/sandboxes/{id}/connect . These endpoints default timeout to 5 minutes and always secure envd access. - Deprecation: The secure option in Sandbox.create is deprecated and ignored because all sandboxes are now secured by default. - Validation update: Client-side validation for the fork count argument has been removed; validation and rejection of invalid counts are now executed directly by the API.

## Recommended actions
- Remove references to the deprecated secure option in Sandbox.create calls.
- Verify that workflows relying on omitted parameters properly accommodate the API-side default behaviors for timeouts, fork counts, internet access, and pause states.
- Handle API-level validation errors for invalid fork counts, as client-side pre-validation is removed.

## Sponsors
No sponsor placement attached.

## Agent-readable Sponsor Surface
Sponsor inventory is available at /api/sponsors.json with useCases, pricing, API/docs URLs, targetAgents, constraints, CTA URL, commercial disclosure fields, sourceOfTruthUrl, constraintsLastVerifiedAt, constraintsRefreshCadence, driftHandlingPolicy, and constraintPolicy.