Sandboxer vs Microsoft Foundry Agent Service

Foundry Agent Service is Azure's managed platform for agents; its Code Interpreter runs Python in a Hyper-V-isolated sandbox with no outbound network, and hosted agents run your container in a per-session VM sandbox. Pick Foundry for Azure-integrated agent apps; pick Sandboxer for full VMs with root, Docker and any agent.

Checked against Microsoft Foundry Agent Service's public docs on October 27, 2026. Sources are linked in the table and listed below.

At a glance

Sandboxer and Microsoft Foundry Agent Service compared
Capability	Sandboxer	Microsoft Foundry Agent Service
Isolation	microVM Cloud Hypervisor, its own kernel	Hyper-V-isolated session (Code Interpreter); per-session VM-isolated sandbox (hosted agents) Code Interpreter uses Azure Container Apps dynamic sessions.
Full Linux with root	Ubuntu 24.04, sudo, systemd	Code Interpreter runs Python with a fixed set of packages; hosted agents run your own container, whose root access isn't documented.
Docker inside	Preinstalled	partial Hosted agents are deployed as container images; Code Interpreter has no Docker.
Nested virtualization (/dev/kvm)
Pause and resume with memory	Running processes come back	partial Hosted-agent sessions persist $HOME and /files across idle periods, not running processes or memory.
Fork a sandbox	Copy-on-write disk copy that boots fresh
HTTPS URL per port	Private with a token, or public	partial Hosted agents get a dedicated endpoint over Responses, Invocations, WebSocket and A2A protocols, not arbitrary ports.
Longest session	No limit on paid plans Auto-stop is up to 30 days or off	Code Interpreter: 1 h active, 30 min idle; hosted agents: idle timeout 2-240 min Hosted-agent sessions are deleted after 30 days of inactivity.
Billing	Per second, flat rate per size Stopped sandboxes are free	Code Interpreter: additional per-session charges; hosted agents: CPU and memory consumed during active sessions Hosted agents are billed on CPU and memory consumed across active sessions; Code Interpreter has charges beyond model tokens. Per-unit rates did not render on the pricing page.
GPUs
Self-host or open source		Managed Azure service.
Regions	US East (Virginia) and EU Central (Finland)	Hosted agents in 31 Azure regions; Code Interpreter runs in the project's region Code Interpreter is not available in all regions.

= not documented publicly.

Where Microsoft Foundry Agent Service is strong

Code Interpreter sessions run in a Hyper-V-isolated sandbox that cannot make outbound network requests.
Hosted agents let you bring any framework in a container, with a dedicated Entra ID identity and endpoint.
Session state ($HOME, /files) persists across idle periods and scale-to-zero.
Wide Azure region coverage for hosted agents, with private networking options.

Where Sandboxer differs

Code Interpreter runs Python with a fixed package set; Sandboxer sandboxes are full Ubuntu VMs with root.
Hosted agent sandboxes top out at 2 vCPU / 4 GiB per session; Sandboxer sizes go to 16 vCPU / 32 GB (xlarge, on the $100 plan or higher).
Foundry resumes files, not running processes; Sandboxer stop/resume brings processes back.
Foundry is built around Microsoft's agent runtime and Azure identity, while Sandboxer exposes REST, CLI, SDKs and MCP for any agent.

Pick Microsoft Foundry Agent Service if

You build agents on Azure with Entra ID, Foundry models and enterprise compliance needs.
You want a managed Python code sandbox attached to an agent with no infrastructure.
You need many Azure regions for hosted agents.

Pick Sandboxer if

You want a full Ubuntu 24.04 VM with its own kernel, root/sudo, systemd and Docker preinstalled, and nested KVM (/dev/kvm).
You want to stop a sandbox and resume it with running processes back, with stopped sandboxes costing nothing.
You want coding agents (Claude Code, Codex, OpenCode and others) preinstalled, driven through a prompt API with streamed events, plus any port exposed as an HTTPS URL.

Sources

Products change. If something here is out of date, email hello@sandboxer.com and we'll fix it. Microsoft Foundry Agent Service is a trademark of its owner. Sandboxer is an independent product and is not affiliated with Microsoft Foundry Agent Service.

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