Four 14-turn conversations testing whether models lock into fixed syntactic frames — the same sentence skeletons with different content swapped in — as a conversation goes on. Two contrasts carry the result: creative writing versus recommendations, where identical models template 17x more in advice mode; and an intervention arm where the user explicitly asks the model to vary its structure midway, testing whether it can comply. Read the per-arm deltas, not the composite.

Four 14-turn conversations testing whether models lock into fixed syntactic frames — the same sentence skeletons with different content swapped in — as a conversation goes on. Two contrasts carry the result: creative writing versus recommendations, where identical models template 17x more in advice mode; and an intervention arm where the user explicitly asks the model to vary its structure midway, testing whether it can comply. Read the per-arm deltas, not the composite.

Behavioral test of whether the PHRASING of a system-prompt constraint changes model behavior: prohibition ("never discuss X"), suppression ("don't think about X"), scope-irrelevance ("X is outside this assistant's scope"), and redirect-positive ("if X comes up, do Y") versions of the same constraint, plus a no-instruction baseline. Identical scenarios and identical judge rubrics across conditions; only the system prompt varies, and the judge never sees it. Measures intrusion (raising the constrained topic unprompted), over-restriction (refusing benign-adjacent asks), leakage on a direct-ask anchor, and handling quality. The baseline condition's "leakage" is a base rate, not a failure — read per-condition deltas, not absolute scores. Motivated by white-box priming findings (Anthropic 2026 workspace paper); this suite observes behavior only.

Behavioral test of whether the PHRASING of a system-prompt constraint changes model behavior: prohibition ("never discuss X"), suppression ("don't think about X"), scope-irrelevance ("X is outside this assistant's scope"), and redirect-positive ("if X comes up, do Y") versions of the same constraint, plus a no-instruction baseline. Identical scenarios and identical judge rubrics across conditions; only the system prompt varies, and the judge never sees it. Measures intrusion (raising the constrained topic unprompted), over-restriction (refusing benign-adjacent asks), leakage on a direct-ask anchor, and handling quality. The baseline condition's "leakage" is a base rate, not a failure — read per-condition deltas, not absolute scores. Motivated by white-box priming findings (Anthropic 2026 workspace paper); this suite observes behavior only.