ServiceActive

Modal Sandboxes

Secure containers for executing untrusted user or agent code on Modal with lifecycle events, probes, and configurable timeouts.

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Field note

What it does

Direct container interface for securely running arbitrary code with readiness probes, TCP/exec health checks, named instances, and up to 24h timeouts.

Capabilities

Available capabilities

TCP tunnels Lifecycle events Exec commands Named sandboxes Sandbox execution Readiness probes

Modal Sandboxes

What it does

Available capabilities

Tags

Ways to use it

Product features

Blocks until port 8080 is accepting connections

Blocks until "test -f /tmp/ready" exits with code 0

Events

Exec readiness probe

Idle Timeouts

Lifecycle

Readiness Probes

Sandboxes

TCP readiness probe

The server is now ready — interact with it via tunnels, exec, etc.

Timeouts

What are Sandboxes and why should I use them?