Code Harness

Code Harness (aka Agentic Harness) is the surrounding program that makes an LLM into an Agent. Includes features such as engineered prompts, tools, sandboxes, and more; harnesses often interact across multiple surfaces.

• Most agentic coding tools are code harnesses.
• Examples: Claude Code, Aider, Cursor, OpenAI Codex, Continue, Cline, Devin, Sweep, Smol Developer, Open Interpreter, AutoGPT, LangChain, CrewAI.

Related: Agentic Coding Tool