The harness mattering more than the model lines up with my experience too. What this paper measures is within-turn constraint decay. The version that bites in m

The harness mattering more than the model lines up with my experience too. What this paper measures is within-turn constraint decay. The version that bites in multi-agent setups is across-session — the architectural rules an agent wrote down on Monday don't reach the agent making the next change on Tuesday.