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8

Harness Engineering

The agent sees what it built and iterates on its own output.

⚙️
Synchronous work → asynchronous orchestration

🎯 WHAT CHANGES BY THE END

You'll kick off a task, leave, and come back to a completed diff that passes your test suite, with observability logs you can replay if something went wrong.

🙋 THIS IS YOU IF

  • ✓The agent runs tests after every change without being asked
  • ✓Pre-commit hooks, linters, and type checks fire automatically. Not because you prompted them
  • ✓When a run fails, you can replay it from logs and see exactly where it broke
  • ✓Security boundaries are explicit: agent execution, generated code, and secrets live in separate spaces

💡 WHAT WE'LL UNTANGLE

  • You still need to be at the keyboard. Nothing runs while you're away
  • Work is sequential. One task at a time, bounded by your session
  • A run that fails silently at step 3 is hard to diagnose if you didn't log intermediate state
← PreviousLevel 7: MCP & SkillsNext →Level 9: Background AgentsLevel 10 removes the orchestrator. Agents coordinate directly, and that's where things get genuinely unsolved.