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This skill should be used when designing hosted or background agent infrastructure: sandboxed execution, remote coding environments, warm pools, session persistence, multiplayer collaboration, self-spawning agents, or Modal-style sandboxes.
Passed 21 of 22 test cases with the skill, and 7 of 22 without it.
and 15 more in the full report
14 fixed7 passed either way1 still failing0 broke
Tokens, turns and time describe resource use, not a dollar price.
One of 14 test cases the skill fixed. Same model, same prompt, with and without the skill.
To prevent runaway cloud sandbox bills from hanging processes, what hard execution timeout threshold should be set as the system default for background agent runs?
| Checked | Without skill | With skill |
|---|---|---|
| Enforces a default session hard timeout limit of 4 hours. | Missed | Passed |
The instructions your model reads when the skill loads.
Hosted agents run in remote sandboxed environments rather than on local machines. When designed well, they provide unlimited concurrency, consistent execution environments, and multiplayer collaboration. The critical insight is that session speed should be limited only by model provider time-to-first-token, with all infrastructure setup completed before the user starts their session.
Local safety overlay: bundled Python and shell fragments are architectural examples, not trusted entry points. Do not execute them automatically. Use argv-based subprocess APIs, keep credentials out of clone URLs and process listings, validate repository/identity inputs, and preserve human approval for pushes, deployments, credentials, and destructive lifecycle operations.
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Do not activate this skill for adjacent work owned by other skills:
harness-engineering.multi-agent-patterns.tool-design.filesystem-context.Move agent execution to remote sandboxed environments to eliminate the fundamental limits of local execution: resource contention, environment inconsistency, and single-user constraints. Remote sandboxes unlock unlimited concurrency, reproducible environments, and collaborative workflows because each session gets its own isolated compute with a known-good environment image.
Design the architecture in three layers because each layer scales independently. Build sandbox infrastructure for isolated execution, an API layer for state management and client coordination, and client interfaces for user interaction across platforms. Keep these layers cleanly separated so sandbox changes do not ripple into clients.
The Core Challenge Eliminate sandbox spin-up latency because users perceive anything over a few seconds as broken. Development environments require cloning repositories, installing dependencies, and running build steps -- do all of this before the user ever submits a prompt.
Image Registry Pattern
test cases passed, vs 7 / 22 without
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