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Harness-IF measures whether agents actually follow AGENTS.md rules (@omarsar0)
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Harness-IF separates a coding agent following your AGENTS.md rules from behavior it would've produced anyway: it scores 256 rules one at a time from execution evidence, then re-runs every task with the rule removed.
In plain words
- A test checks whether a coding system truly follows written project rules.
- It examines 256 rules separately using evidence from the system's completed actions.
- Each task runs again without its rule to reveal whether that instruction changed the result.
- Teams can separate genuine rule-following from behavior the system would have produced anyway.
Appeared in
- Agent leaderboards rank specialization, and the harness thesis reaches robots
Aug 14, 2026 · from X
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