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Agents fail less because the model is weak and more because they run in a messy, unsafe environment. Flue, an open-source TypeScript framework from Astro co-founder Fred K. Schott, attacks that problem — and just hit its 1.0 Beta on June 16.

## What Flue does

Flue is an “agent harness”: a headless, programmable runtime that hands an agent the things it actually needs to work — sessions, tools, filesystem access, skills, and a secure sandbox to execute in. Instead of bolting an agent onto your app, you give it a durable, isolated environment with structured deployment targets, so long-running autonomous tasks don’t fall over or escape their box. It’s Apache-2.0 licensed and already past 3,800 GitHub stars.

## From triage tool to framework

The origin story is telling. Flue started in February as an internal Astro experiment — automatic triage for new GitHub issues. By spring, the orchestration and skills code had been generalized enough that it no longer looked Astro-specific; it looked like infrastructure any agent could run on. That bottom-up path, plus a well-known maintainer, is why Flue is being talked about as a serious agent-harness contender rather than another demo.