When stacking 5+ simultaneous constraints (schema, safety, reasoning), even top models drop below 50% pass rate due to multiplicative independent failures, not pairwise interference.
Summary
Production deployments routinely combine format, safety, and logic constraints. This quantifies exactly when your prompt engineering hits a wall and reveals that constraint interaction is multiplicative, not additive—changing mitigation strategy.
Why it matters
Production deployments routinely combine format, safety, and logic constraints. This quantifies exactly when your prompt engineering hits a wall and reveals that constraint interaction is multiplicative, not additive—changing mitigation strategy.
Implementation verdict
Doesn't replace anything yet; this is diagnostic data. Immediately relevant for teams shipping multi-constraint systems: stress-test your prompts/guardrails beyond 5 concurrent rules. The 2x structural-constraint penalty suggests routing complex reasoning and output format through separate calls or model passes may recover degraded performance.
Sources
Dev Signal
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