The Agent Harness Framework Not another SDK. Build powerful, autonomous agents with Flue's programmable TypeScript harness. Write once, deploy anywhere. export default async function ({ init, payload, env }) { // Initialize a new agent. // Provide a hosted sandbox, or use Flue's built-in virtual sandbox. const agent = await init({ model: 'anthropic/claude-sonnet-4-6' }); const session = await agen