[ANNOUNCE] Agent Sandbox updates: New releases (up to v0.4.3) and Kubernetes Blog Post!

[Janet Kuo]

Hi everyone,

It’s been a while since our last announcement for v0.1.1 in February. The Agent Sandbox subproject has been moving fast, and I’m excited to share a roundup of our recent progress, as well as a new post on the Kubernetes blog!

Justin Santa Barbara and I recently published a blog post: Running Agents on Kubernetes with Agent Sandbox. It covers the architectural shift towards long-running, stateful AI agents and how the agent-sandbox project introduces the right abstractions (like the Sandbox CRD, strong isolation, and SandboxWarmPool) to orchestrate these workloads natively on Kubernetes.

Since v0.1.1, we have released several major versions (currently at v0.4.3) with a strong focus on security, storage, and developer experience. Key highlights include:

• Secure by Default Networking: Sandboxes now default to a strict network isolation posture, blocking access to internal cluster IPs and node metadata unless explicitly managed in the SandboxTemplate .
• Persistent Storage & Lifecycle: We added volumeClaimTemplates to SandboxTemplate for per-instance persistent storage. We also introduced a Finished condition and a ttlSecondsAfterFinished field for the automatic cleanup of finished claims.
• Python SDK Advancements: The Python SDK now features an asynchronous client, in-cluster connection configurations that bypass the router, and native support for suspend and resume functionality using GKE Pod Snapshots.
• Native Go Client: We introduced a typed Kubernetes Go client generated via client-gen, allowing Go developers to easily interact with Agent Sandbox resources.
• Controller Stability: The core controller has been migrated to a Deployment model with leader election enabled by default. Additionally, SandboxWarmPool now creates full Sandbox CRs instead of bare pods, with significantly improved correctness and adoption logic.

Getting Started You can find the installation instructions for the latest release, along with our new getting started guides, examples, and expanded documentation, on our GitHub repository and our Docs site.

We'd love to see you get involved:

• Meetings: We host our biweekly community meetings on Mondays at 9:00 PT (Pacific Time). You can add it to your schedule using our Meeting Calendar.
• Slack: Join the discussion in the #agent-sandbox channel on the Kubernetes Slack.

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Janet Kuo