Methodology Official term
Harness Engineering
An engineering approach for making AI coding agents work reliably through repo entry points, rules, validation, observability, and cleanup loops.
One-line definition
Harness Engineering is the engineering layer that makes coding agents work reliably inside repos over time.
Official name
Harness Engineering
Common aliases
agent-first engineering
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What it is
- + It focuses on repo entry points, validation paths, rules, observability, and cleanup mechanisms.
- + It matters most once coding agents begin changing real repos instead of handling isolated prompts.
What it is not
- - It is not just longer prompting.
- - It is not a replacement for software engineering.
Why it matters now
- • It explains why long-term agent reliability often depends more on environment design than on one-off prompting.
It becomes useful when teams start asking not just “can the agent write code?” but “can it keep working well inside the repo over time?”
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Related terms
FAQ
Is Harness Engineering just a new label for Prompt Engineering?
No. Prompting is one layer, while Harness Engineering is about the long-term engineering system around the agent.