Measured metrics for {suggested_param_dict}: {Performance_metrics}

**OPTIMIZATION GOAL: {goal_action}**
**Constraints: {constraints}**

**Current iteration: {current_iteration} / {maximum_iteration}**

Based on this result, suggest the next parameter set to test.

Reply with **either**  
1️ one JSON object + <= 60-word rationale (next set), **or**  
2️ I am confident that the best parameter set is: <json>` when you have found the best parameter set.
