Show HN: Build A Harness – open-source, modular harness layer for AI agents

Category: devtools

Tags: ai-agents, workflow-orchestration, llm-observability

Score: 6.0/10 (Innovation: 5, Technical: 7, Documentation: 6, Utility: 6)

Build A Harness is an open-source visual canvas for designing AI agent harnesses with an 11-layer control architecture, compiling the same specification to multiple orchestrators like LangGraph and CrewAI. It stands out by offering a structured, opinionated approach to agent governance (beliefs, control state, verification, recovery) beyond simple workflows, though it's still in public alpha with a niche but growing audience.

Target audience: backend devs, ai-engineers, devops

Repository: https://buildaharness.com/ · Python · NOASSERTION · 4 stars

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