Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 100%, so the baseline score is 3. The description adds value by providing a concrete example ('customer_support_ticket costs $12 per ticket and takes 15 minutes without AI') that maps to process_name, cost_per_unit_usd, unit_label, and avg_duration_minutes, making parameter relationships clearer than the schema alone.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.