Symphony

Builders shared concrete Symphony, create_agent, and MCP setup guides after arguing that model switching is easy but harness switching is not. The playbooks matter because they make harness engineering more repeatable, so teams can copy tested tooling and integration patterns.

OpenAI released Symphony, an orchestration layer that turns issue trackers into Codex agent queues for PR generation and review. Early users say it can move many tickets in parallel, but token burn rises quickly when agents fan out.