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LangChain’s own team published a blog post titled “Agent Frameworks, Runtimes, and Harnesses – oh my!” that explains the distinction. Frameworks provide abstractions for building agents. Runtimes provide infrastructure for running them. Harnesses provide opinionated defaults and built-in capabilities for deploying them reliably. LangChain is the first. An agent harness is the third. They are … Read more

Harness engineering builds infrastructure that makes AI agents reliable. Learn the five core components, architecture patterns, and real-world results.