modal-sandboxes-knowledge
This skill should be used when the user asks to run isolated or untrusted code on Modal.com. PROACTIVELY activate for: modal.Sandbox, safe user code execution, coding playgrounds, named sandboxes, PTY sessions, filesystem snapshots, timeout and resource limits, egress policies, sandbox lifecycle cleanup, terminate(), and security review for code execution. Provides: sandbox security checklist, lifecycle and cleanup patterns, egress/resource-limit recipes, and snapshot/PTY usage examples.
What this skill does
# Modal Sandboxes Knowledge Use this skill for Modal Sandbox design, security, and operations. For ordinary functions, GPU jobs, or deployment topics, use `modal-compute:modal-compute-knowledge`. ## Essential security checklist 1. Treat all submitted code and files as untrusted. 2. Use explicit timeout, CPU, memory, and disk constraints. 3. Prefer deny-by-default network egress; allow only required destinations. 4. Clean up every sandbox with `terminate()` or a scoped lifecycle. 5. Avoid passing long-lived credentials into sandbox environments unless strictly required. 6. Capture stdout/stderr and return codes separately for auditing and debugging. ## Common patterns - **One-shot execution**: create a sandbox, run a command, collect output, terminate. - **Named sandbox**: reuse a per-session sandbox for interactive workflows. - **PTY session**: support shell-like interaction while preserving resource limits. - **Snapshot workflow**: prebuild filesystem state, then launch from a known baseline. ## Detailed reference See `references/sandboxes-code-execution.md` for code examples and operational notes.
Related in Security
mac-ops
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a11y-audit
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erpclaw
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assess
IncludedAssesses and rates quality 0-10 across multiple dimensions (correctness, maintainability, security, performance, testability, simplicity) with pros/cons analysis. Compares against project conventions and prior decisions from memory. Produces structured evaluation reports with actionable improvement suggestions. Use when evaluating code, designs, architectures, or comparing alternative approaches.
spring-boot-security-jwt
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code-hardcode-audit
IncludedDetect hardcoded values, magic numbers, and leaked secrets. TRIGGERS - hardcode audit, magic numbers, PLR2004, secret scanning.