Metis is an MIT-licensed coding agent runtime for terminal and desktop. Unlike thin model wrappers, it focuses on the agent harness: durable memory, Plan/Build workflows, recursive named agents, verification gates, and recoverable sessions. In a controlled Terminal-Bench 2.1 run using the same DeepSeek V4 Flash model and budget, Metis solved 73/89 tasks vs 60/89 with OpenCode.
