Agent sandbox and skills frameworks cluster on GitHub trending

Category: Agentic coding
Status: discussion
Sources: withastro/flue, GitHub trending
Summary: GitHub's daily trending view shows several agent-sandbox and agent-skills frameworks clustering, led by the Astro team's flue ("the sandbox agent framework," Apache-2.0, about 5,900 stars), alongside agent-native harnesses and skills-packaging repositories. flue provides sandboxed execution, durable sessions, tool integration, and skill packaging, with deployment targets including Node.js, Cloudflare Workers, and GitHub Actions.
Why it matters: Sandboxed execution and packaged skills are consolidating into a standard layer for running coding agents safely, echoing the agent-skill security work tracked earlier with NVIDIA SkillSpector.
Follow-up: Watch for a tagged stable release of flue and independent adoption beyond trending activity.