Agent skill · software engineering · sickn33
hosted-agents
Build background agents in sandboxed environments. Use for hosted coding agents, sandboxed VMs, Modal sandboxes, and remote coding environments.
Why this skill is useful
Provides detailed architecture patterns and strategies for building scalable hosted agent infrastructures that the AI wouldn't reliably generate on its own.
What it needs
Requires docker installed locally. About 7k tokens when loaded. Last updated 2026-08-07. 44,571 stars on the source repository.
What this skill does
Hosted Agent Infrastructure 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. When to Use Activate this skill when: Building background coding agents that run independently of user devices Designing sandboxed execution environments for agent workloads Implementing multiplayer agent sessions with shared state Creating multi-client agent interfaces (Slack, Web, Chrome extensions) Scaling agent infrastructure beyond local machine constraints Building systems where agents spawn sub-agents for parallel work Core Concepts Hosted agents address the fundamental limitation of local agent execution: resource contention, environment inconsistency, and single-user constraints. By moving agent execution to remote sandboxed environments, teams gain unlimited concurrency, reproducible environments, and collaborative workflows. The architecture consists of three layers: sandbox infrastructure for isolated execution, API layer for state management and client coordination, and client interfaces for user interaction across platforms. Each layer has specific design requirements that enable the system to scale. Detailed Topics Sandbox Infrastructure The Core Challenge Spinning up full development environments quickly is the primary technical challenge. Users expect near-instant session starts, but development environments require cloning repositories, installing dependencies, and running build steps. Image Registry Pattern Pre-build environment images on a regular cadence (every 30 minutes works well). …
How to use it
Reference it in AdaL, Claude Code, Cursor or any coding agent — nothing to install:
@skills sickn33/hosted-agents--15e01e