![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="%23D95C41" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round"><line x1="12.1" y1="11.9" x2="18.9" y2="8.2" /><line x1="12.1" y1="12.1" x2="20.3" y2="12.9" /><line x1="12.2" y1="12.4" x2="16.6" y2="19.1" /><line x1="11.8" y1="12.4" x2="7.3" y2="19.2" /><line x1="11.9" y1="12.1" x2="3.7" y2="13.3" /><line x1="11.8" y1="11.7" x2="7.8" y2="4.4" /></svg>)
Harness Components Example
For a coding agent working in a local repository:
Model: the LLM itself
Harness:
- system prompt
- AGENTS.md
- bash tool
- file read/write tools
- git access
- local filesystem
- startup scripts
- test commands
- stop hooks
- lint checks
- evaluator loop
If you change any of the above harness pieces, you change the effective agent.